Fix possible overrun of the last byte of dbuf (coverity 552).

[reactos.git] / reactos / base / services / dhcp / dhclient.c

/*      $OpenBSD: dhclient.c,v 1.62 2004/12/05 18:35:51 deraadt Exp $   */

/*
 * Copyright 2004 Henning Brauer <henning@openbsd.org>
 * Copyright (c) 1995, 1996, 1997, 1998, 1999
 * The Internet Software Consortium.    All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of The Internet Software Consortium nor the names
 *    of its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This software has been written for the Internet Software Consortium
 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
 * Enterprises.  To learn more about the Internet Software Consortium,
 * see ``http://www.vix.com/isc''.  To learn more about Vixie
 * Enterprises, see ``http://www.vix.com''.
 *
 * This client was substantially modified and enhanced by Elliot Poger
 * for use on Linux while he was working on the MosquitoNet project at
 * Stanford.
 *
 * The current version owes much to Elliot's Linux enhancements, but
 * was substantially reorganized and partially rewritten by Ted Lemon
 * so as to use the same networking framework that the Internet Software
 * Consortium DHCP server uses.   Much system-specific configuration code
 * was moved into a shell script so that as support for more operating
 * systems is added, it will not be necessary to port and maintain
 * system-specific configuration code to these operating systems - instead,
 * the shell script can invoke the native tools to accomplish the same
 * purpose.
 */

#include "rosdhcp.h"
#include <winsock2.h>
#include "dhcpd.h"
#include "privsep.h"

#define PERIOD 0x2e
#define hyphenchar(c) ((c) == 0x2d)
#define bslashchar(c) ((c) == 0x5c)
#define periodchar(c) ((c) == PERIOD)
#define asterchar(c) ((c) == 0x2a)
#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) || \
            ((c) >= 0x61 && (c) <= 0x7a))
#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)

#define borderchar(c) (alphachar(c) || digitchar(c))
#define middlechar(c) (borderchar(c) || hyphenchar(c))
#define domainchar(c) ((c) > 0x20 && (c) < 0x7f)

unsigned long debug_trace_level = 0; /* DEBUG_ULTRA */
time_t cur_time;
time_t default_lease_time = 43200; /* 12 hours... */

char *path_dhclient_conf = _PATH_DHCLIENT_CONF;
char *path_dhclient_db = NULL;

int log_perror = 1;
int privfd;
//int nullfd = -1;

struct iaddr iaddr_broadcast = { 4, { 255, 255, 255, 255 } };
struct in_addr inaddr_any;
struct sockaddr_in sockaddr_broadcast;
unsigned long old_default_route = 0;

/*
 * ASSERT_STATE() does nothing now; it used to be
 * assert (state_is == state_shouldbe).
 */
#define ASSERT_STATE(state_is, state_shouldbe) {}

#define TIME_MAX 2147483647

int             log_priority;
int             no_daemon;
int             unknown_ok = 1;
int             routefd;

struct interface_info   *ifi = NULL;

void             usage(void);
int              check_option(struct client_lease *l, int option);
int              ipv4addrs(char * buf);
int              res_hnok(const char *dn);
char            *option_as_string(unsigned int code, unsigned char *data, int len);
int              fork_privchld(int, int);
int              check_arp( struct interface_info *ip, struct client_lease *lp );

#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))

time_t  scripttime;

/* XXX Implement me */
int check_arp( struct interface_info *ip, struct client_lease *lp ) {
    return 1;
}

static VOID CALLBACK
DispatchMain(DWORD argc, LPTSTR *argv)
{
        dispatch();
}

static SERVICE_TABLE_ENTRY ServiceTable[2] =
{
    {TEXT("DHCP"), DispatchMain},
    {NULL, NULL}
};

int
main(int argc, char *argv[])
{
    int i = 0;
        ApiInit();
        AdapterInit();
        PipeInit();

        tzset();
        time(&cur_time);

        memset(&sockaddr_broadcast, 0, sizeof(sockaddr_broadcast));
        sockaddr_broadcast.sin_family = AF_INET;
        sockaddr_broadcast.sin_port = htons(REMOTE_PORT);
        sockaddr_broadcast.sin_addr.s_addr = INADDR_BROADCAST;
        inaddr_any.s_addr = INADDR_ANY;

        DH_DbgPrint(MID_TRACE,("DHCP Service Started\n"));

        read_client_conf();

        if (!interface_link_status(ifi->name)) {
            DH_DbgPrint(MID_TRACE,("%s: no link ", ifi->name));
            Sleep(1000);
            while (!interface_link_status(ifi->name)) {
                DH_DbgPrint(MID_TRACE,("."));
                if (++i > 10) {
                    DH_DbgPrint(MID_TRACE,("Giving up for now on adapter [%s]\n", ifi->name));
                }
                Sleep(1000);
            }
            DH_DbgPrint(MID_TRACE,("Got link on [%s]\n", ifi->name));
        }

        DH_DbgPrint(MID_TRACE,("Discover Interfaces\n"));

        /* If no adapters were found, just idle for now ... If any show up,
         * then we'll start it later */
        if( ifi ) {
            /* set up the interface */
            discover_interfaces(ifi);

            DH_DbgPrint
                (MID_TRACE,
                 ("Setting init state and restarting interface %p\n",ifi));
        }

        bootp_packet_handler = do_packet;

        DH_DbgPrint(MID_TRACE,("Going into dispatch()\n"));

        StartServiceCtrlDispatcher(ServiceTable);

        /* not reached */
        return (0);
}

void
usage(void)
{
//      extern char     *__progname;

//      fprintf(stderr, "usage: %s [-dqu] ", __progname);
        fprintf(stderr, "usage: dhclient [-dqu] ");
        fprintf(stderr, "[-c conffile] [-l leasefile] interface\n");
        exit(1);
}

/*
 * Individual States:
 *
 * Each routine is called from the dhclient_state_machine() in one of
 * these conditions:
 * -> entering INIT state
 * -> recvpacket_flag == 0: timeout in this state
 * -> otherwise: received a packet in this state
 *
 * Return conditions as handled by dhclient_state_machine():
 * Returns 1, sendpacket_flag = 1: send packet, reset timer.
 * Returns 1, sendpacket_flag = 0: just reset the timer (wait for a milestone).
 * Returns 0: finish the nap which was interrupted for no good reason.
 *
 * Several per-interface variables are used to keep track of the process:
 *   active_lease: the lease that is being used on the interface
 *                 (null pointer if not configured yet).
 *   offered_leases: leases corresponding to DHCPOFFER messages that have
 *                   been sent to us by DHCP servers.
 *   acked_leases: leases corresponding to DHCPACK messages that have been
 *                 sent to us by DHCP servers.
 *   sendpacket: DHCP packet we're trying to send.
 *   destination: IP address to send sendpacket to
 * In addition, there are several relevant per-lease variables.
 *   T1_expiry, T2_expiry, lease_expiry: lease milestones
 * In the active lease, these control the process of renewing the lease;
 * In leases on the acked_leases list, this simply determines when we
 * can no longer legitimately use the lease.
 */

void
state_reboot(void *ipp)
{
        struct interface_info *ip = ipp;
        ULONG foo = (ULONG) GetTickCount();

        /* If we don't remember an active lease, go straight to INIT. */
        if (!ip->client->active || ip->client->active->is_bootp) {
                state_init(ip);
                return;
        }

        /* We are in the rebooting state. */
        ip->client->state = S_REBOOTING;

        /* make_request doesn't initialize xid because it normally comes
           from the DHCPDISCOVER, but we haven't sent a DHCPDISCOVER,
           so pick an xid now. */
        ip->client->xid = RtlRandom(&foo);

        /* Make a DHCPREQUEST packet, and set appropriate per-interface
           flags. */
        make_request(ip, ip->client->active);
        ip->client->destination = iaddr_broadcast;
        ip->client->first_sending = cur_time;
        ip->client->interval = ip->client->config->initial_interval;

        /* Zap the medium list... */
        ip->client->medium = NULL;

        /* Send out the first DHCPREQUEST packet. */
        send_request(ip);
}

/*
 * Called when a lease has completely expired and we've
 * been unable to renew it.
 */
void
state_init(void *ipp)
{
        struct interface_info *ip = ipp;

        ASSERT_STATE(state, S_INIT);

        /* Make a DHCPDISCOVER packet, and set appropriate per-interface
           flags. */
        make_discover(ip, ip->client->active);
        ip->client->xid = ip->client->packet.xid;
        ip->client->destination = iaddr_broadcast;
        ip->client->state = S_SELECTING;
        ip->client->first_sending = cur_time;
        ip->client->interval = ip->client->config->initial_interval;

        /* Add an immediate timeout to cause the first DHCPDISCOVER packet
           to go out. */
        send_discover(ip);
}

/*
 * state_selecting is called when one or more DHCPOFFER packets
 * have been received and a configurable period of time has passed.
 */
void
state_selecting(void *ipp)
{
        struct interface_info *ip = ipp;
        struct client_lease *lp, *next, *picked;

        ASSERT_STATE(state, S_SELECTING);

        /* Cancel state_selecting and send_discover timeouts, since either
           one could have got us here. */
        cancel_timeout(state_selecting, ip);
        cancel_timeout(send_discover, ip);

        /* We have received one or more DHCPOFFER packets.   Currently,
           the only criterion by which we judge leases is whether or
           not we get a response when we arp for them. */
        picked = NULL;
        for (lp = ip->client->offered_leases; lp; lp = next) {
                next = lp->next;

                /* Check to see if we got an ARPREPLY for the address
                   in this particular lease. */
                if (!picked) {
                    if( !check_arp(ip,lp) ) goto freeit;
                    picked = lp;
                    picked->next = NULL;
                } else {
freeit:
                        free_client_lease(lp);
                }
        }
        ip->client->offered_leases = NULL;

        /* If we just tossed all the leases we were offered, go back
           to square one. */
        if (!picked) {
                ip->client->state = S_INIT;
                state_init(ip);
                return;
        }

        /* If it was a BOOTREPLY, we can just take the address right now. */
        if (!picked->options[DHO_DHCP_MESSAGE_TYPE].len) {
                ip->client->new = picked;

                /* Make up some lease expiry times
                   XXX these should be configurable. */
                ip->client->new->expiry = cur_time + 12000;
                ip->client->new->renewal += cur_time + 8000;
                ip->client->new->rebind += cur_time + 10000;

                ip->client->state = S_REQUESTING;

                /* Bind to the address we received. */
                bind_lease(ip);
                return;
        }

        /* Go to the REQUESTING state. */
        ip->client->destination = iaddr_broadcast;
        ip->client->state = S_REQUESTING;
        ip->client->first_sending = cur_time;
        ip->client->interval = ip->client->config->initial_interval;

        /* Make a DHCPREQUEST packet from the lease we picked. */
        make_request(ip, picked);
        ip->client->xid = ip->client->packet.xid;

        /* Toss the lease we picked - we'll get it back in a DHCPACK. */
        free_client_lease(picked);

        /* Add an immediate timeout to send the first DHCPREQUEST packet. */
        send_request(ip);
}

/* state_requesting is called when we receive a DHCPACK message after
   having sent out one or more DHCPREQUEST packets. */

void
dhcpack(struct packet *packet)
{
        struct interface_info *ip = packet->interface;
        struct client_lease *lease;

        /* If we're not receptive to an offer right now, or if the offer
           has an unrecognizable transaction id, then just drop it. */
        if (packet->interface->client->xid != packet->raw->xid ||
            (packet->interface->hw_address.hlen != packet->raw->hlen) ||
            (memcmp(packet->interface->hw_address.haddr,
            packet->raw->chaddr, packet->raw->hlen)))
                return;

        if (ip->client->state != S_REBOOTING &&
            ip->client->state != S_REQUESTING &&
            ip->client->state != S_RENEWING &&
            ip->client->state != S_REBINDING)
                return;

        note("DHCPACK from %s", piaddr(packet->client_addr));

        lease = packet_to_lease(packet);
        if (!lease) {
                note("packet_to_lease failed.");
                return;
        }

        ip->client->new = lease;

        /* Stop resending DHCPREQUEST. */
        cancel_timeout(send_request, ip);

        /* Figure out the lease time. */
        if (ip->client->new->options[DHO_DHCP_LEASE_TIME].data)
                ip->client->new->expiry = getULong(
                    ip->client->new->options[DHO_DHCP_LEASE_TIME].data);
        else
                ip->client->new->expiry = default_lease_time;
        /* A number that looks negative here is really just very large,
           because the lease expiry offset is unsigned. */
        if (ip->client->new->expiry < 0)
                ip->client->new->expiry = TIME_MAX;
        /* XXX should be fixed by resetting the client state */
        if (ip->client->new->expiry < 60)
                ip->client->new->expiry = 60;

        /* Take the server-provided renewal time if there is one;
           otherwise figure it out according to the spec. */
        if (ip->client->new->options[DHO_DHCP_RENEWAL_TIME].len)
                ip->client->new->renewal = getULong(
                    ip->client->new->options[DHO_DHCP_RENEWAL_TIME].data);
        else
                ip->client->new->renewal = ip->client->new->expiry / 2;

        /* Same deal with the rebind time. */
        if (ip->client->new->options[DHO_DHCP_REBINDING_TIME].len)
                ip->client->new->rebind = getULong(
                    ip->client->new->options[DHO_DHCP_REBINDING_TIME].data);
        else
                ip->client->new->rebind = ip->client->new->renewal +
                    ip->client->new->renewal / 2 + ip->client->new->renewal / 4;

#ifdef __REACTOS__
        ip->client->new->obtained = cur_time;
#endif
        ip->client->new->expiry += cur_time;
        /* Lease lengths can never be negative. */
        if (ip->client->new->expiry < cur_time)
                ip->client->new->expiry = TIME_MAX;
        ip->client->new->renewal += cur_time;
        if (ip->client->new->renewal < cur_time)
                ip->client->new->renewal = TIME_MAX;
        ip->client->new->rebind += cur_time;
        if (ip->client->new->rebind < cur_time)
                ip->client->new->rebind = TIME_MAX;

        bind_lease(ip);
}

void set_name_servers( struct client_lease *new_lease ) {
    if( new_lease->options[DHO_DOMAIN_NAME_SERVERS].len ) {
        HKEY RegKey;
        struct iaddr nameserver;
        char *nsbuf;
        int i, addrs =
            new_lease->options[DHO_DOMAIN_NAME_SERVERS].len / sizeof(ULONG);

               /* XXX I'm setting addrs to 1 until we are ready up the chain */
               addrs = 1;
        nsbuf = malloc( addrs * sizeof(IP_ADDRESS_STRING) );
        nsbuf[0] = 0;

        if( nsbuf && !RegOpenKeyEx
            ( HKEY_LOCAL_MACHINE,
              "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters",
              0, KEY_WRITE, &RegKey ) ) {
            for( i = 0; i < addrs; i++ ) {
                nameserver.len = sizeof(ULONG);
                memcpy( nameserver.iabuf,
                        new_lease->options[DHO_DOMAIN_NAME_SERVERS].data +
                        (i * sizeof(ULONG)), sizeof(ULONG) );
                strcat( nsbuf, piaddr(nameserver) );
                if( i != addrs-1 ) strcat( nsbuf, "," );
            }

            DH_DbgPrint(MID_TRACE,("Setting DhcpNameserver: %s\n", nsbuf));

            RegSetValueEx( RegKey, "DhcpNameServer", 0, REG_SZ,
                           (LPBYTE)nsbuf, strlen(nsbuf) + 1);
        }
        // free(NULL) is defined to be OK too
        free( nsbuf );
    }
}

void setup_adapter( PDHCP_ADAPTER Adapter, struct client_lease *new_lease ) {
    struct iaddr netmask;

    if( Adapter->NteContext )
        DeleteIPAddress( Adapter->NteContext );

    /* Set up our default router if we got one from the DHCP server */
    if( new_lease->options[DHO_SUBNET_MASK].len ) {
        NTSTATUS Status;

        memcpy( netmask.iabuf,
                new_lease->options[DHO_SUBNET_MASK].data,
                new_lease->options[DHO_SUBNET_MASK].len );

        Status = AddIPAddress
            ( *((ULONG*)new_lease->address.iabuf),
              *((ULONG*)netmask.iabuf),
              Adapter->IfMib.dwIndex,
              &Adapter->NteContext,
              &Adapter->NteInstance );

        if( !NT_SUCCESS(Status) )
            warning("AddIPAddress: %lx\n", Status);
    }

    if( new_lease->options[DHO_ROUTERS].len ) {
        MIB_IPFORWARDROW RouterMib;
        NTSTATUS Status;

        RouterMib.dwForwardDest = 0; /* Default route */
        RouterMib.dwForwardMask = 0;
        RouterMib.dwForwardMetric1 = 1;

        if( old_default_route ) {
            /* If we set a default route before, delete it before continuing */
            RouterMib.dwForwardDest = old_default_route;
            DeleteIpForwardEntry( &RouterMib );
        }

        RouterMib.dwForwardNextHop =
            *((ULONG*)new_lease->options[DHO_ROUTERS].data);

        Status = CreateIpForwardEntry( &RouterMib );

        if( !NT_SUCCESS(Status) )
            warning("CreateIpForwardEntry: %lx\n", Status);
        else
            old_default_route = RouterMib.dwForwardNextHop;
    }
}


void
bind_lease(struct interface_info *ip)
{
    PDHCP_ADAPTER Adapter;
    struct client_lease *new_lease = ip->client->new;

    /* Remember the medium. */
    ip->client->new->medium = ip->client->medium;
    ip->client->active = ip->client->new;
    ip->client->new = NULL;

    /* Set up a timeout to start the renewal process. */
    /* Timeout of zero means no timeout (some implementations seem to use
     * one day).
     */
    if( ip->client->active->renewal - cur_time )
        add_timeout(ip->client->active->renewal, state_bound, ip);

    note("bound to %s -- renewal in %ld seconds.",
         piaddr(ip->client->active->address),
         ip->client->active->renewal - cur_time);

    ip->client->state = S_BOUND;

    Adapter = AdapterFindInfo( ip );

    if( Adapter )  setup_adapter( Adapter, new_lease );
    else warning("Could not find adapter for info %p\n", ip);

    set_name_servers( new_lease );

    reinitialize_interfaces();
}

/*
 * state_bound is called when we've successfully bound to a particular
 * lease, but the renewal time on that lease has expired.   We are
 * expected to unicast a DHCPREQUEST to the server that gave us our
 * original lease.
 */
void
state_bound(void *ipp)
{
        struct interface_info *ip = ipp;

        ASSERT_STATE(state, S_BOUND);

        /* T1 has expired. */
        make_request(ip, ip->client->active);
        ip->client->xid = ip->client->packet.xid;

        if (ip->client->active->options[DHO_DHCP_SERVER_IDENTIFIER].len == 4) {
                memcpy(ip->client->destination.iabuf, ip->client->active->
                    options[DHO_DHCP_SERVER_IDENTIFIER].data, 4);
                ip->client->destination.len = 4;
        } else
                ip->client->destination = iaddr_broadcast;

        ip->client->first_sending = cur_time;
        ip->client->interval = ip->client->config->initial_interval;
        ip->client->state = S_RENEWING;

        /* Send the first packet immediately. */
        send_request(ip);
}

void
bootp(struct packet *packet)
{
        struct iaddrlist *ap;

        if (packet->raw->op != BOOTREPLY)
                return;

        /* If there's a reject list, make sure this packet's sender isn't
           on it. */
        for (ap = packet->interface->client->config->reject_list;
            ap; ap = ap->next) {
                if (addr_eq(packet->client_addr, ap->addr)) {
                        note("BOOTREPLY from %s rejected.", piaddr(ap->addr));
                        return;
                }
        }
        dhcpoffer(packet);
}

void
dhcp(struct packet *packet)
{
        struct iaddrlist *ap;
        void (*handler)(struct packet *);
        char *type;

        switch (packet->packet_type) {
        case DHCPOFFER:
                handler = dhcpoffer;
                type = "DHCPOFFER";
                break;
        case DHCPNAK:
                handler = dhcpnak;
                type = "DHCPNACK";
                break;
        case DHCPACK:
                handler = dhcpack;
                type = "DHCPACK";
                break;
        default:
                return;
        }

        /* If there's a reject list, make sure this packet's sender isn't
           on it. */
        for (ap = packet->interface->client->config->reject_list;
            ap; ap = ap->next) {
                if (addr_eq(packet->client_addr, ap->addr)) {
                        note("%s from %s rejected.", type, piaddr(ap->addr));
                        return;
                }
        }
        (*handler)(packet);
}

void
dhcpoffer(struct packet *packet)
{
        struct interface_info *ip = packet->interface;
        struct client_lease *lease, *lp;
        int i;
        int arp_timeout_needed = 0, stop_selecting;
        char *name = packet->options[DHO_DHCP_MESSAGE_TYPE].len ?
            "DHCPOFFER" : "BOOTREPLY";

        /* If we're not receptive to an offer right now, or if the offer
           has an unrecognizable transaction id, then just drop it. */
        if (ip->client->state != S_SELECTING ||
            packet->interface->client->xid != packet->raw->xid ||
            (packet->interface->hw_address.hlen != packet->raw->hlen) ||
            (memcmp(packet->interface->hw_address.haddr,
            packet->raw->chaddr, packet->raw->hlen)))
                return;

        note("%s from %s", name, piaddr(packet->client_addr));


        /* If this lease doesn't supply the minimum required parameters,
           blow it off. */
        for (i = 0; ip->client->config->required_options[i]; i++) {
                if (!packet->options[ip->client->config->
                    required_options[i]].len) {
                        note("%s isn't satisfactory.", name);
                        return;
                }
        }

        /* If we've already seen this lease, don't record it again. */
        for (lease = ip->client->offered_leases;
            lease; lease = lease->next) {
                if (lease->address.len == sizeof(packet->raw->yiaddr) &&
                    !memcmp(lease->address.iabuf,
                    &packet->raw->yiaddr, lease->address.len)) {
                        debug("%s already seen.", name);
                        return;
                }
        }

        lease = packet_to_lease(packet);
        if (!lease) {
                note("packet_to_lease failed.");
                return;
        }

        /* If this lease was acquired through a BOOTREPLY, record that
           fact. */
        if (!packet->options[DHO_DHCP_MESSAGE_TYPE].len)
                lease->is_bootp = 1;

        /* Record the medium under which this lease was offered. */
        lease->medium = ip->client->medium;

        /* Send out an ARP Request for the offered IP address. */
        if( !check_arp( ip, lease ) ) {
            note("Arp check failed\n");
            return;
        }

        /* Figure out when we're supposed to stop selecting. */
        stop_selecting =
            ip->client->first_sending + ip->client->config->select_interval;

        /* If this is the lease we asked for, put it at the head of the
           list, and don't mess with the arp request timeout. */
        if (lease->address.len == ip->client->requested_address.len &&
            !memcmp(lease->address.iabuf,
            ip->client->requested_address.iabuf,
            ip->client->requested_address.len)) {
                lease->next = ip->client->offered_leases;
                ip->client->offered_leases = lease;
        } else {
                /* If we already have an offer, and arping for this
                   offer would take us past the selection timeout,
                   then don't extend the timeout - just hope for the
                   best. */
                if (ip->client->offered_leases &&
                    (cur_time + arp_timeout_needed) > stop_selecting)
                        arp_timeout_needed = 0;

                /* Put the lease at the end of the list. */
                lease->next = NULL;
                if (!ip->client->offered_leases)
                        ip->client->offered_leases = lease;
                else {
                        for (lp = ip->client->offered_leases; lp->next;
                            lp = lp->next)
                                ;       /* nothing */
                        lp->next = lease;
                }
        }

        /* If we're supposed to stop selecting before we've had time
           to wait for the ARPREPLY, add some delay to wait for
           the ARPREPLY. */
        if (stop_selecting - cur_time < arp_timeout_needed)
                stop_selecting = cur_time + arp_timeout_needed;

        /* If the selecting interval has expired, go immediately to
           state_selecting().  Otherwise, time out into
           state_selecting at the select interval. */
        if (stop_selecting <= 0)
                state_selecting(ip);
        else {
                add_timeout(stop_selecting, state_selecting, ip);
                cancel_timeout(send_discover, ip);
        }
}

/* Allocate a client_lease structure and initialize it from the parameters
   in the specified packet. */

struct client_lease *
packet_to_lease(struct packet *packet)
{
        struct client_lease *lease;
        int i;

        lease = malloc(sizeof(struct client_lease));

        if (!lease) {
                warning("dhcpoffer: no memory to record lease.");
                return (NULL);
        }

        memset(lease, 0, sizeof(*lease));

        /* Copy the lease options. */
        for (i = 0; i < 256; i++) {
                if (packet->options[i].len) {
                        lease->options[i].data =
                            malloc(packet->options[i].len + 1);
                        if (!lease->options[i].data) {
                                warning("dhcpoffer: no memory for option %d", i);
                                free_client_lease(lease);
                                return (NULL);
                        } else {
                                memcpy(lease->options[i].data,
                                    packet->options[i].data,
                                    packet->options[i].len);
                                lease->options[i].len =
                                    packet->options[i].len;
                                lease->options[i].data[lease->options[i].len] =
                                    0;
                        }
                        if (!check_option(lease,i)) {
                                /* ignore a bogus lease offer */
                                warning("Invalid lease option - ignoring offer");
                                free_client_lease(lease);
                                return (NULL);
                        }
                }
        }

        lease->address.len = sizeof(packet->raw->yiaddr);
        memcpy(lease->address.iabuf, &packet->raw->yiaddr, lease->address.len);
#ifdef __REACTOS__
        lease->serveraddress.len = sizeof(packet->raw->siaddr);
        memcpy(lease->serveraddress.iabuf, &packet->raw->siaddr, lease->address.len);
#endif

        /* If the server name was filled out, copy it. */
        if ((!packet->options[DHO_DHCP_OPTION_OVERLOAD].len ||
            !(packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 2)) &&
            packet->raw->sname[0]) {
                lease->server_name = malloc(DHCP_SNAME_LEN + 1);
                if (!lease->server_name) {
                        warning("dhcpoffer: no memory for server name.");
                        free_client_lease(lease);
                        return (NULL);
                }
                memcpy(lease->server_name, packet->raw->sname, DHCP_SNAME_LEN);
                lease->server_name[DHCP_SNAME_LEN]='\0';
                if (!res_hnok(lease->server_name) ) {
                        warning("Bogus server name %s",  lease->server_name );
                        free_client_lease(lease);
                        return (NULL);
                }

        }

        /* Ditto for the filename. */
        if ((!packet->options[DHO_DHCP_OPTION_OVERLOAD].len ||
            !(packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 1)) &&
            packet->raw->file[0]) {
                /* Don't count on the NUL terminator. */
                lease->filename = malloc(DHCP_FILE_LEN + 1);
                if (!lease->filename) {
                        warning("dhcpoffer: no memory for filename.");
                        free_client_lease(lease);
                        return (NULL);
                }
                memcpy(lease->filename, packet->raw->file, DHCP_FILE_LEN);
                lease->filename[DHCP_FILE_LEN]='\0';
        }
        return lease;
}

void
dhcpnak(struct packet *packet)
{
        struct interface_info *ip = packet->interface;

        /* If we're not receptive to an offer right now, or if the offer
           has an unrecognizable transaction id, then just drop it. */
        if (packet->interface->client->xid != packet->raw->xid ||
            (packet->interface->hw_address.hlen != packet->raw->hlen) ||
            (memcmp(packet->interface->hw_address.haddr,
            packet->raw->chaddr, packet->raw->hlen)))
                return;

        if (ip->client->state != S_REBOOTING &&
            ip->client->state != S_REQUESTING &&
            ip->client->state != S_RENEWING &&
            ip->client->state != S_REBINDING)
                return;

        note("DHCPNAK from %s", piaddr(packet->client_addr));

        if (!ip->client->active) {
                note("DHCPNAK with no active lease.\n");
                return;
        }

        free_client_lease(ip->client->active);
        ip->client->active = NULL;

        /* Stop sending DHCPREQUEST packets... */
        cancel_timeout(send_request, ip);

        ip->client->state = S_INIT;
        state_init(ip);
}

/* Send out a DHCPDISCOVER packet, and set a timeout to send out another
   one after the right interval has expired.  If we don't get an offer by
   the time we reach the panic interval, call the panic function. */

void
send_discover(void *ipp)
{
        struct interface_info *ip = ipp;
        int interval, increase = 1;

        DH_DbgPrint(MID_TRACE,("Doing discover on interface %p\n",ip));

        /* Figure out how long it's been since we started transmitting. */
        interval = cur_time - ip->client->first_sending;

        /* If we're past the panic timeout, call the script and tell it
           we haven't found anything for this interface yet. */
        if (interval > ip->client->config->timeout) {
                state_panic(ip);
                return;
        }

        /* If we're selecting media, try the whole list before doing
           the exponential backoff, but if we've already received an
           offer, stop looping, because we obviously have it right. */
        if (!ip->client->offered_leases &&
            ip->client->config->media) {
                int fail = 0;

                if (ip->client->medium) {
                        ip->client->medium = ip->client->medium->next;
                        increase = 0;
                }
                if (!ip->client->medium) {
                        if (fail)
                                error("No valid media types for %s!", ip->name);
                        ip->client->medium = ip->client->config->media;
                        increase = 1;
                }

                note("Trying medium \"%s\" %d", ip->client->medium->string,
                    increase);
                /* XXX Support other media types eventually */
        }

        /*
         * If we're supposed to increase the interval, do so.  If it's
         * currently zero (i.e., we haven't sent any packets yet), set
         * it to one; otherwise, add to it a random number between zero
         * and two times itself.  On average, this means that it will
         * double with every transmission.
         */
        if (increase) {
                if (!ip->client->interval)
                        ip->client->interval =
                            ip->client->config->initial_interval;
                else {
                        ip->client->interval += (rand() >> 2) %
                            (2 * ip->client->interval);
                }

                /* Don't backoff past cutoff. */
                if (ip->client->interval >
                    ip->client->config->backoff_cutoff)
                        ip->client->interval =
                                ((ip->client->config->backoff_cutoff / 2)
                                 + ((rand() >> 2) %
                                    ip->client->config->backoff_cutoff));
        } else if (!ip->client->interval)
                ip->client->interval =
                        ip->client->config->initial_interval;

        /* If the backoff would take us to the panic timeout, just use that
           as the interval. */
        if (cur_time + ip->client->interval >
            ip->client->first_sending + ip->client->config->timeout)
                ip->client->interval =
                        (ip->client->first_sending +
                         ip->client->config->timeout) - cur_time + 1;

        /* Record the number of seconds since we started sending. */
        if (interval < 65536)
                ip->client->packet.secs = htons(interval);
        else
                ip->client->packet.secs = htons(65535);
        ip->client->secs = ip->client->packet.secs;

        note("DHCPDISCOVER on %s to %s port %d interval %ld",
            ip->name, inet_ntoa(sockaddr_broadcast.sin_addr),
            ntohs(sockaddr_broadcast.sin_port), ip->client->interval);

        /* Send out a packet. */
        (void)send_packet(ip, &ip->client->packet, ip->client->packet_length,
            inaddr_any, &sockaddr_broadcast, NULL);

        DH_DbgPrint(MID_TRACE,("discover timeout: now %x -> then %x\n",
                               cur_time, cur_time + ip->client->interval));

        add_timeout(cur_time + ip->client->interval, send_discover, ip);
}

/*
 * state_panic gets called if we haven't received any offers in a preset
 * amount of time.   When this happens, we try to use existing leases
 * that haven't yet expired, and failing that, we call the client script
 * and hope it can do something.
 */
void
state_panic(void *ipp)
{
        struct interface_info *ip = ipp;
        struct client_lease *loop = ip->client->active;
        struct client_lease *lp;

        note("No DHCPOFFERS received.");

        /* We may not have an active lease, but we may have some
           predefined leases that we can try. */
        if (!ip->client->active && ip->client->leases)
                goto activate_next;

        /* Run through the list of leases and see if one can be used. */
        while (ip->client->active) {
                if (ip->client->active->expiry > cur_time) {
                        note("Trying recorded lease %s",
                            piaddr(ip->client->active->address));
                        /* Run the client script with the existing
                           parameters. */
                        script_init("TIMEOUT",
                            ip->client->active->medium);
                        script_write_params("new_", ip->client->active);
                        if (ip->client->alias)
                                script_write_params("alias_",
                                    ip->client->alias);

                        /* If the old lease is still good and doesn't
                           yet need renewal, go into BOUND state and
                           timeout at the renewal time. */
                        if (cur_time <
                            ip->client->active->renewal) {
                            ip->client->state = S_BOUND;
                            note("bound: renewal in %ld seconds.",
                                 ip->client->active->renewal -
                                 cur_time);
                            add_timeout(
                                ip->client->active->renewal,
                                state_bound, ip);
                        } else {
                            ip->client->state = S_BOUND;
                            note("bound: immediate renewal.");
                            state_bound(ip);
                        }
                        reinitialize_interfaces();
                        return;
                }

                /* If there are no other leases, give up. */
                if (!ip->client->leases) {
                        ip->client->leases = ip->client->active;
                        ip->client->active = NULL;
                        break;
                }

activate_next:
                /* Otherwise, put the active lease at the end of the
                   lease list, and try another lease.. */
                for (lp = ip->client->leases; lp->next; lp = lp->next)
                        ;
                lp->next = ip->client->active;
                if (lp->next)
                        lp->next->next = NULL;
                ip->client->active = ip->client->leases;
                ip->client->leases = ip->client->leases->next;

                /* If we already tried this lease, we've exhausted the
                   set of leases, so we might as well give up for
                   now. */
                if (ip->client->active == loop)
                        break;
                else if (!loop)
                        loop = ip->client->active;
        }

        /* No leases were available, or what was available didn't work, so
           tell the shell script that we failed to allocate an address,
           and try again later. */
        note("No working leases in persistent database - sleeping.\n");
        ip->client->state = S_INIT;
        add_timeout(cur_time + ip->client->config->retry_interval, state_init,
            ip);
        /* XXX Take any failure actions necessary */
}

void
send_request(void *ipp)
{
        struct interface_info *ip = ipp;
        struct sockaddr_in destination;
        struct in_addr from;
        int interval;

        /* Figure out how long it's been since we started transmitting. */
        interval = cur_time - ip->client->first_sending;

        /* If we're in the INIT-REBOOT or REQUESTING state and we're
           past the reboot timeout, go to INIT and see if we can
           DISCOVER an address... */
        /* XXX In the INIT-REBOOT state, if we don't get an ACK, it
           means either that we're on a network with no DHCP server,
           or that our server is down.  In the latter case, assuming
           that there is a backup DHCP server, DHCPDISCOVER will get
           us a new address, but we could also have successfully
           reused our old address.  In the former case, we're hosed
           anyway.  This is not a win-prone situation. */
        if ((ip->client->state == S_REBOOTING ||
            ip->client->state == S_REQUESTING) &&
            interval > ip->client->config->reboot_timeout) {
                ip->client->state = S_INIT;
                cancel_timeout(send_request, ip);
                state_init(ip);
                return;
        }

        /* If we're in the reboot state, make sure the media is set up
           correctly. */
        if (ip->client->state == S_REBOOTING &&
            !ip->client->medium &&
            ip->client->active->medium ) {
                script_init("MEDIUM", ip->client->active->medium);

                /* If the medium we chose won't fly, go to INIT state. */
                /* XXX Nothing for now */

                /* Record the medium. */
                ip->client->medium = ip->client->active->medium;
        }

        /* If the lease has expired, relinquish the address and go back
           to the INIT state. */
        if (ip->client->state != S_REQUESTING &&
            cur_time > ip->client->active->expiry) {
            PDHCP_ADAPTER Adapter = AdapterFindInfo( ip );
            /* Run the client script with the new parameters. */
            /* No script actions necessary in the expiry case */
            /* Now do a preinit on the interface so that we can
               discover a new address. */

            if( Adapter )
                DeleteIPAddress( Adapter->NteContext );

            ip->client->state = S_INIT;
            state_init(ip);
            return;
        }

        /* Do the exponential backoff... */
        if (!ip->client->interval)
                ip->client->interval = ip->client->config->initial_interval;
        else
                ip->client->interval += ((rand() >> 2) %
                    (2 * ip->client->interval));

        /* Don't backoff past cutoff. */
        if (ip->client->interval >
            ip->client->config->backoff_cutoff)
                ip->client->interval =
                    ((ip->client->config->backoff_cutoff / 2) +
                    ((rand() >> 2) % ip->client->interval));

        /* If the backoff would take us to the expiry time, just set the
           timeout to the expiry time. */
        if (ip->client->state != S_REQUESTING &&
            cur_time + ip->client->interval >
            ip->client->active->expiry)
                ip->client->interval =
                    ip->client->active->expiry - cur_time + 1;

        /* If the lease T2 time has elapsed, or if we're not yet bound,
           broadcast the DHCPREQUEST rather than unicasting. */
        memset(&destination, 0, sizeof(destination));
        if (ip->client->state == S_REQUESTING ||
            ip->client->state == S_REBOOTING ||
            cur_time > ip->client->active->rebind)
                destination.sin_addr.s_addr = INADDR_BROADCAST;
        else
                memcpy(&destination.sin_addr.s_addr,
                    ip->client->destination.iabuf,
                    sizeof(destination.sin_addr.s_addr));
        destination.sin_port = htons(REMOTE_PORT);
        destination.sin_family = AF_INET;
//      destination.sin_len = sizeof(destination);

        if (ip->client->state != S_REQUESTING)
                memcpy(&from, ip->client->active->address.iabuf,
                    sizeof(from));
        else
                from.s_addr = INADDR_ANY;

        /* Record the number of seconds since we started sending. */
        if (ip->client->state == S_REQUESTING)
                ip->client->packet.secs = ip->client->secs;
        else {
                if (interval < 65536)
                        ip->client->packet.secs = htons(interval);
                else
                        ip->client->packet.secs = htons(65535);
        }

        note("DHCPREQUEST on %s to %s port %d", ip->name,
            inet_ntoa(destination.sin_addr), ntohs(destination.sin_port));

        /* Send out a packet. */
        (void) send_packet(ip, &ip->client->packet, ip->client->packet_length,
            from, &destination, NULL);

        add_timeout(cur_time + ip->client->interval, send_request, ip);
}

void
send_decline(void *ipp)
{
        struct interface_info *ip = ipp;

        note("DHCPDECLINE on %s to %s port %d", ip->name,
            inet_ntoa(sockaddr_broadcast.sin_addr),
            ntohs(sockaddr_broadcast.sin_port));

        /* Send out a packet. */
        (void) send_packet(ip, &ip->client->packet, ip->client->packet_length,
            inaddr_any, &sockaddr_broadcast, NULL);
}

void
make_discover(struct interface_info *ip, struct client_lease *lease)
{
        unsigned char discover = DHCPDISCOVER;
        struct tree_cache *options[256];
        struct tree_cache option_elements[256];
        int i;
        ULONG foo = (ULONG) GetTickCount();

        memset(option_elements, 0, sizeof(option_elements));
        memset(options, 0, sizeof(options));
        memset(&ip->client->packet, 0, sizeof(ip->client->packet));

        /* Set DHCP_MESSAGE_TYPE to DHCPDISCOVER */
        i = DHO_DHCP_MESSAGE_TYPE;
        options[i] = &option_elements[i];
        options[i]->value = &discover;
        options[i]->len = sizeof(discover);
        options[i]->buf_size = sizeof(discover);
        options[i]->timeout = 0xFFFFFFFF;

        /* Request the options we want */
        i  = DHO_DHCP_PARAMETER_REQUEST_LIST;
        options[i] = &option_elements[i];
        options[i]->value = ip->client->config->requested_options;
        options[i]->len = ip->client->config->requested_option_count;
        options[i]->buf_size =
                ip->client->config->requested_option_count;
        options[i]->timeout = 0xFFFFFFFF;

        /* If we had an address, try to get it again. */
        if (lease) {
                ip->client->requested_address = lease->address;
                i = DHO_DHCP_REQUESTED_ADDRESS;
                options[i] = &option_elements[i];
                options[i]->value = lease->address.iabuf;
                options[i]->len = lease->address.len;
                options[i]->buf_size = lease->address.len;
                options[i]->timeout = 0xFFFFFFFF;
        } else
                ip->client->requested_address.len = 0;

        /* Send any options requested in the config file. */
        for (i = 0; i < 256; i++)
                if (!options[i] &&
                    ip->client->config->send_options[i].data) {
                        options[i] = &option_elements[i];
                        options[i]->value =
                            ip->client->config->send_options[i].data;
                        options[i]->len =
                            ip->client->config->send_options[i].len;
                        options[i]->buf_size =
                            ip->client->config->send_options[i].len;
                        options[i]->timeout = 0xFFFFFFFF;
                }

        /* Set up the option buffer... */
        ip->client->packet_length = cons_options(NULL, &ip->client->packet, 0,
            options, 0, 0, 0, NULL, 0);
        if (ip->client->packet_length < BOOTP_MIN_LEN)
                ip->client->packet_length = BOOTP_MIN_LEN;

        ip->client->packet.op = BOOTREQUEST;
        ip->client->packet.htype = ip->hw_address.htype;
        ip->client->packet.hlen = ip->hw_address.hlen;
        ip->client->packet.hops = 0;
        ip->client->packet.xid = RtlRandom(&foo);
        ip->client->packet.secs = 0; /* filled in by send_discover. */
        ip->client->packet.flags = 0;

        memset(&(ip->client->packet.ciaddr),
            0, sizeof(ip->client->packet.ciaddr));
        memset(&(ip->client->packet.yiaddr),
            0, sizeof(ip->client->packet.yiaddr));
        memset(&(ip->client->packet.siaddr),
            0, sizeof(ip->client->packet.siaddr));
        memset(&(ip->client->packet.giaddr),
            0, sizeof(ip->client->packet.giaddr));
        memcpy(ip->client->packet.chaddr,
            ip->hw_address.haddr, ip->hw_address.hlen);
}


void
make_request(struct interface_info *ip, struct client_lease * lease)
{
        unsigned char request = DHCPREQUEST;
        struct tree_cache *options[256];
        struct tree_cache option_elements[256];
        int i;

        memset(options, 0, sizeof(options));
        memset(&ip->client->packet, 0, sizeof(ip->client->packet));

        /* Set DHCP_MESSAGE_TYPE to DHCPREQUEST */
        i = DHO_DHCP_MESSAGE_TYPE;
        options[i] = &option_elements[i];
        options[i]->value = &request;
        options[i]->len = sizeof(request);
        options[i]->buf_size = sizeof(request);
        options[i]->timeout = 0xFFFFFFFF;

        /* Request the options we want */
        i = DHO_DHCP_PARAMETER_REQUEST_LIST;
        options[i] = &option_elements[i];
        options[i]->value = ip->client->config->requested_options;
        options[i]->len = ip->client->config->requested_option_count;
        options[i]->buf_size =
                ip->client->config->requested_option_count;
        options[i]->timeout = 0xFFFFFFFF;

        /* If we are requesting an address that hasn't yet been assigned
           to us, use the DHCP Requested Address option. */
        if (ip->client->state == S_REQUESTING) {
                /* Send back the server identifier... */
                i = DHO_DHCP_SERVER_IDENTIFIER;
                options[i] = &option_elements[i];
                options[i]->value = lease->options[i].data;
                options[i]->len = lease->options[i].len;
                options[i]->buf_size = lease->options[i].len;
                options[i]->timeout = 0xFFFFFFFF;
        }
        if (ip->client->state == S_REQUESTING ||
            ip->client->state == S_REBOOTING) {
                ip->client->requested_address = lease->address;
                i = DHO_DHCP_REQUESTED_ADDRESS;
                options[i] = &option_elements[i];
                options[i]->value = lease->address.iabuf;
                options[i]->len = lease->address.len;
                options[i]->buf_size = lease->address.len;
                options[i]->timeout = 0xFFFFFFFF;
        } else
                ip->client->requested_address.len = 0;

        /* Send any options requested in the config file. */
        for (i = 0; i < 256; i++)
                if (!options[i] &&
                    ip->client->config->send_options[i].data) {
                        options[i] = &option_elements[i];
                        options[i]->value =
                            ip->client->config->send_options[i].data;
                        options[i]->len =
                            ip->client->config->send_options[i].len;
                        options[i]->buf_size =
                            ip->client->config->send_options[i].len;
                        options[i]->timeout = 0xFFFFFFFF;
                }

        /* Set up the option buffer... */
        ip->client->packet_length = cons_options(NULL, &ip->client->packet, 0,
            options, 0, 0, 0, NULL, 0);
        if (ip->client->packet_length < BOOTP_MIN_LEN)
                ip->client->packet_length = BOOTP_MIN_LEN;

        ip->client->packet.op = BOOTREQUEST;
        ip->client->packet.htype = ip->hw_address.htype;
        ip->client->packet.hlen = ip->hw_address.hlen;
        ip->client->packet.hops = 0;
        ip->client->packet.xid = ip->client->xid;
        ip->client->packet.secs = 0; /* Filled in by send_request. */

        /* If we own the address we're requesting, put it in ciaddr;
           otherwise set ciaddr to zero. */
        if (ip->client->state == S_BOUND ||
            ip->client->state == S_RENEWING ||
            ip->client->state == S_REBINDING) {
                memcpy(&ip->client->packet.ciaddr,
                    lease->address.iabuf, lease->address.len);
                ip->client->packet.flags = 0;
        } else {
                memset(&ip->client->packet.ciaddr, 0,
                    sizeof(ip->client->packet.ciaddr));
                ip->client->packet.flags = 0;
        }

        memset(&ip->client->packet.yiaddr, 0,
            sizeof(ip->client->packet.yiaddr));
        memset(&ip->client->packet.siaddr, 0,
            sizeof(ip->client->packet.siaddr));
        memset(&ip->client->packet.giaddr, 0,
            sizeof(ip->client->packet.giaddr));
        memcpy(ip->client->packet.chaddr,
            ip->hw_address.haddr, ip->hw_address.hlen);
}

void
make_decline(struct interface_info *ip, struct client_lease *lease)
{
        struct tree_cache *options[256], message_type_tree;
        struct tree_cache requested_address_tree;
        struct tree_cache server_id_tree, client_id_tree;
        unsigned char decline = DHCPDECLINE;
        int i;

        memset(options, 0, sizeof(options));
        memset(&ip->client->packet, 0, sizeof(ip->client->packet));

        /* Set DHCP_MESSAGE_TYPE to DHCPDECLINE */
        i = DHO_DHCP_MESSAGE_TYPE;
        options[i] = &message_type_tree;
        options[i]->value = &decline;
        options[i]->len = sizeof(decline);
        options[i]->buf_size = sizeof(decline);
        options[i]->timeout = 0xFFFFFFFF;

        /* Send back the server identifier... */
        i = DHO_DHCP_SERVER_IDENTIFIER;
        options[i] = &server_id_tree;
        options[i]->value = lease->options[i].data;
        options[i]->len = lease->options[i].len;
        options[i]->buf_size = lease->options[i].len;
        options[i]->timeout = 0xFFFFFFFF;

        /* Send back the address we're declining. */
        i = DHO_DHCP_REQUESTED_ADDRESS;
        options[i] = &requested_address_tree;
        options[i]->value = lease->address.iabuf;
        options[i]->len = lease->address.len;
        options[i]->buf_size = lease->address.len;
        options[i]->timeout = 0xFFFFFFFF;

        /* Send the uid if the user supplied one. */
        i = DHO_DHCP_CLIENT_IDENTIFIER;
        if (ip->client->config->send_options[i].len) {
                options[i] = &client_id_tree;
                options[i]->value = ip->client->config->send_options[i].data;
                options[i]->len = ip->client->config->send_options[i].len;
                options[i]->buf_size = ip->client->config->send_options[i].len;
                options[i]->timeout = 0xFFFFFFFF;
        }


        /* Set up the option buffer... */
        ip->client->packet_length = cons_options(NULL, &ip->client->packet, 0,
            options, 0, 0, 0, NULL, 0);
        if (ip->client->packet_length < BOOTP_MIN_LEN)
                ip->client->packet_length = BOOTP_MIN_LEN;

        ip->client->packet.op = BOOTREQUEST;
        ip->client->packet.htype = ip->hw_address.htype;
        ip->client->packet.hlen = ip->hw_address.hlen;
        ip->client->packet.hops = 0;
        ip->client->packet.xid = ip->client->xid;
        ip->client->packet.secs = 0; /* Filled in by send_request. */
        ip->client->packet.flags = 0;

        /* ciaddr must always be zero. */
        memset(&ip->client->packet.ciaddr, 0,
            sizeof(ip->client->packet.ciaddr));
        memset(&ip->client->packet.yiaddr, 0,
            sizeof(ip->client->packet.yiaddr));
        memset(&ip->client->packet.siaddr, 0,
            sizeof(ip->client->packet.siaddr));
        memset(&ip->client->packet.giaddr, 0,
            sizeof(ip->client->packet.giaddr));
        memcpy(ip->client->packet.chaddr,
            ip->hw_address.haddr, ip->hw_address.hlen);
}

void
free_client_lease(struct client_lease *lease)
{
        int i;

        if (lease->server_name)
                free(lease->server_name);
        if (lease->filename)
                free(lease->filename);
        for (i = 0; i < 256; i++) {
                if (lease->options[i].len)
                        free(lease->options[i].data);
        }
        free(lease);
}

FILE *leaseFile;

void
rewrite_client_leases(void)
{
        struct client_lease *lp;

        if (!leaseFile) {
                leaseFile = fopen(path_dhclient_db, "w");
                if (!leaseFile)
                        error("can't create %s: %m", path_dhclient_db);
        } else {
                fflush(leaseFile);
                rewind(leaseFile);
        }

        for (lp = ifi->client->leases; lp; lp = lp->next)
                write_client_lease(ifi, lp, 1);
        if (ifi->client->active)
                write_client_lease(ifi, ifi->client->active, 1);

        fflush(leaseFile);
}

void
write_client_lease(struct interface_info *ip, struct client_lease *lease,
    int rewrite)
{
        static int leases_written;
        struct tm *t;
        int i;

        if (!rewrite) {
                if (leases_written++ > 20) {
                        rewrite_client_leases();
                        leases_written = 0;
                }
        }

        /* If the lease came from the config file, we don't need to stash
           a copy in the lease database. */
        if (lease->is_static)
                return;

        if (!leaseFile) {       /* XXX */
                leaseFile = fopen(path_dhclient_db, "w");
                if (!leaseFile)
                        error("can't create %s: %m", path_dhclient_db);
        }

        fprintf(leaseFile, "lease {\n");
        if (lease->is_bootp)
                fprintf(leaseFile, "  bootp;\n");
        fprintf(leaseFile, "  interface \"%s\";\n", ip->name);
        fprintf(leaseFile, "  fixed-address %s;\n", piaddr(lease->address));
        if (lease->filename)
                fprintf(leaseFile, "  filename \"%s\";\n", lease->filename);
        if (lease->server_name)
                fprintf(leaseFile, "  server-name \"%s\";\n",
                    lease->server_name);
        if (lease->medium)
                fprintf(leaseFile, "  medium \"%s\";\n", lease->medium->string);
        for (i = 0; i < 256; i++)
                if (lease->options[i].len)
                        fprintf(leaseFile, "  option %s %s;\n",
                            dhcp_options[i].name,
                            pretty_print_option(i, lease->options[i].data,
                            lease->options[i].len, 1, 1));

        t = gmtime(&lease->renewal);
        fprintf(leaseFile, "  renew %d %d/%d/%d %02d:%02d:%02d;\n",
            t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
            t->tm_hour, t->tm_min, t->tm_sec);
        t = gmtime(&lease->rebind);
        fprintf(leaseFile, "  rebind %d %d/%d/%d %02d:%02d:%02d;\n",
            t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
            t->tm_hour, t->tm_min, t->tm_sec);
        t = gmtime(&lease->expiry);
        fprintf(leaseFile, "  expire %d %d/%d/%d %02d:%02d:%02d;\n",
            t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
            t->tm_hour, t->tm_min, t->tm_sec);
        fprintf(leaseFile, "}\n");
        fflush(leaseFile);
}

void
script_init(char *reason, struct string_list *medium)
{
        size_t           len, mediumlen = 0;
        struct imsg_hdr  hdr;
        struct buf      *buf;
        int              errs;

        if (medium != NULL && medium->string != NULL)
                mediumlen = strlen(medium->string);

        hdr.code = IMSG_SCRIPT_INIT;
        hdr.len = sizeof(struct imsg_hdr) +
            sizeof(size_t) + mediumlen +
            sizeof(size_t) + strlen(reason);

        if ((buf = buf_open(hdr.len)) == NULL)
                error("buf_open: %m");

        errs = 0;
        errs += buf_add(buf, &hdr, sizeof(hdr));
        errs += buf_add(buf, &mediumlen, sizeof(mediumlen));
        if (mediumlen > 0)
                errs += buf_add(buf, medium->string, mediumlen);
        len = strlen(reason);
        errs += buf_add(buf, &len, sizeof(len));
        errs += buf_add(buf, reason, len);

        if (errs)
                error("buf_add: %m");

        if (buf_close(privfd, buf) == -1)
                error("buf_close: %m");
}

void
priv_script_init(char *reason, char *medium)
{
        struct interface_info *ip = ifi;

        if (ip) {
            // XXX Do we need to do anything?
        }
}

void
priv_script_write_params(char *prefix, struct client_lease *lease)
{
        struct interface_info *ip = ifi;
        u_int8_t dbuf[1500];
        int i, len = 0;

#if 0
        script_set_env(ip->client, prefix, "ip_address",
            piaddr(lease->address));
#endif

        if (lease->options[DHO_SUBNET_MASK].len &&
            (lease->options[DHO_SUBNET_MASK].len <
            sizeof(lease->address.iabuf))) {
                struct iaddr netmask, subnet, broadcast;

                memcpy(netmask.iabuf, lease->options[DHO_SUBNET_MASK].data,
                    lease->options[DHO_SUBNET_MASK].len);
                netmask.len = lease->options[DHO_SUBNET_MASK].len;

                subnet = subnet_number(lease->address, netmask);
                if (subnet.len) {
#if 0
                        script_set_env(ip->client, prefix, "network_number",
                            piaddr(subnet));
#endif
                        if (!lease->options[DHO_BROADCAST_ADDRESS].len) {
                                broadcast = broadcast_addr(subnet, netmask);
                                if (broadcast.len)
#if 0
                                        script_set_env(ip->client, prefix,
                                            "broadcast_address",
                                            piaddr(broadcast));
#else
                                ;
#endif
                        }
                }
        }

#if 0
        if (lease->filename)
                script_set_env(ip->client, prefix, "filename", lease->filename);
        if (lease->server_name)
                script_set_env(ip->client, prefix, "server_name",
                    lease->server_name);
#endif

        for (i = 0; i < 256; i++) {
                u_int8_t *dp = NULL;

                if (ip->client->config->defaults[i].len) {
                        if (lease->options[i].len) {
                                switch (
                                    ip->client->config->default_actions[i]) {
                                case ACTION_DEFAULT:
                                        dp = lease->options[i].data;
                                        len = lease->options[i].len;
                                        break;
                                case ACTION_SUPERSEDE:
supersede:
                                        dp = ip->client->
                                                config->defaults[i].data;
                                        len = ip->client->
                                                config->defaults[i].len;
                                        break;
                                case ACTION_PREPEND:
                                        len = ip->client->
                                            config->defaults[i].len +
                                            lease->options[i].len;
                                        if (len >= sizeof(dbuf)) {
                                                warning("no space to %s %s",
                                                    "prepend option",
                                                    dhcp_options[i].name);
                                                goto supersede;
                                        }
                                        dp = dbuf;
                                        memcpy(dp,
                                                ip->client->
                                                config->defaults[i].data,
                                                ip->client->
                                                config->defaults[i].len);
                                        memcpy(dp + ip->client->
                                                config->defaults[i].len,
                                                lease->options[i].data,
                                                lease->options[i].len);
                                        dp[len] = '\0';
                                        break;
                                case ACTION_APPEND:
                                        len = ip->client->
                                            config->defaults[i].len +
                                            lease->options[i].len;
                                        if (len > sizeof(dbuf)) {
                                                warning("no space to %s %s",
                                                    "append option",
                                                    dhcp_options[i].name);
                                                goto supersede;
                                        }
                                        dp = dbuf;
                                        memcpy(dp,
                                                lease->options[i].data,
                                                lease->options[i].len);
                                        memcpy(dp + lease->options[i].len,
                                                ip->client->
                                                config->defaults[i].data,
                                                ip->client->
                                                config->defaults[i].len);
                                        dp[len] = '\0';
                                }
                        } else {
                                dp = ip->client->
                                        config->defaults[i].data;
                                len = ip->client->
                                        config->defaults[i].len;
                        }
                } else if (lease->options[i].len) {
                        len = lease->options[i].len;
                        dp = lease->options[i].data;
                } else {
                        len = 0;
                }
#if 0
                if (len) {
                        char name[256];

                        if (dhcp_option_ev_name(name, sizeof(name),
                            &dhcp_options[i]))
                                script_set_env(ip->client, prefix, name,
                                    pretty_print_option(i, dp, len, 0, 0));
                }
#endif
        }
#if 0
        snprintf(tbuf, sizeof(tbuf), "%d", (int)lease->expiry);
        script_set_env(ip->client, prefix, "expiry", tbuf);
#endif
}

void
script_write_params(char *prefix, struct client_lease *lease)
{
        size_t           fn_len = 0, sn_len = 0, pr_len = 0;
        struct imsg_hdr  hdr;
        struct buf      *buf;
        int              errs, i;

        if (lease->filename != NULL)
                fn_len = strlen(lease->filename);
        if (lease->server_name != NULL)
                sn_len = strlen(lease->server_name);
        if (prefix != NULL)
                pr_len = strlen(prefix);

        hdr.code = IMSG_SCRIPT_WRITE_PARAMS;
        hdr.len = sizeof(hdr) + sizeof(struct client_lease) +
            sizeof(size_t) + fn_len + sizeof(size_t) + sn_len +
            sizeof(size_t) + pr_len;

        for (i = 0; i < 256; i++)
                hdr.len += sizeof(int) + lease->options[i].len;

        scripttime = time(NULL);

        if ((buf = buf_open(hdr.len)) == NULL)
                error("buf_open: %m");

        errs = 0;
        errs += buf_add(buf, &hdr, sizeof(hdr));
        errs += buf_add(buf, lease, sizeof(struct client_lease));
        errs += buf_add(buf, &fn_len, sizeof(fn_len));
        errs += buf_add(buf, lease->filename, fn_len);
        errs += buf_add(buf, &sn_len, sizeof(sn_len));
        errs += buf_add(buf, lease->server_name, sn_len);
        errs += buf_add(buf, &pr_len, sizeof(pr_len));
        errs += buf_add(buf, prefix, pr_len);

        for (i = 0; i < 256; i++) {
                errs += buf_add(buf, &lease->options[i].len,
                    sizeof(lease->options[i].len));
                errs += buf_add(buf, lease->options[i].data,
                    lease->options[i].len);
        }

        if (errs)
                error("buf_add: %m");

        if (buf_close(privfd, buf) == -1)
                error("buf_close: %m");
}

int
dhcp_option_ev_name(char *buf, size_t buflen, struct dhcp_option *option)
{
        int i;

        for (i = 0; option->name[i]; i++) {
                if (i + 1 == buflen)
                        return 0;
                if (option->name[i] == '-')
                        buf[i] = '_';
                else
                        buf[i] = option->name[i];
        }

        buf[i] = 0;
        return 1;
}

#if 0
void
go_daemon(void)
{
        static int state = 0;

        if (no_daemon || state)
                return;

        state = 1;

        /* Stop logging to stderr... */
        log_perror = 0;

        if (daemon(1, 0) == -1)
                error("daemon");

        /* we are chrooted, daemon(3) fails to open /dev/null */
        if (nullfd != -1) {
                dup2(nullfd, STDIN_FILENO);
                dup2(nullfd, STDOUT_FILENO);
                dup2(nullfd, STDERR_FILENO);
                close(nullfd);
                nullfd = -1;
        }
}
#endif

int
check_option(struct client_lease *l, int option)
{
        char *opbuf;
        char *sbuf;

        /* we use this, since this is what gets passed to dhclient-script */

        opbuf = pretty_print_option(option, l->options[option].data,
            l->options[option].len, 0, 0);

        sbuf = option_as_string(option, l->options[option].data,
            l->options[option].len);

        switch (option) {
        case DHO_SUBNET_MASK:
        case DHO_TIME_SERVERS:
        case DHO_NAME_SERVERS:
        case DHO_ROUTERS:
        case DHO_DOMAIN_NAME_SERVERS:
        case DHO_LOG_SERVERS:
        case DHO_COOKIE_SERVERS:
        case DHO_LPR_SERVERS:
        case DHO_IMPRESS_SERVERS:
        case DHO_RESOURCE_LOCATION_SERVERS:
        case DHO_SWAP_SERVER:
        case DHO_BROADCAST_ADDRESS:
        case DHO_NIS_SERVERS:
        case DHO_NTP_SERVERS:
        case DHO_NETBIOS_NAME_SERVERS:
        case DHO_NETBIOS_DD_SERVER:
        case DHO_FONT_SERVERS:
        case DHO_DHCP_SERVER_IDENTIFIER:
                if (!ipv4addrs(opbuf)) {
                        warning("Invalid IP address in option(%d): %s", option, opbuf);
                        return (0);
                }
                return (1)  ;
        case DHO_HOST_NAME:
        case DHO_DOMAIN_NAME:
        case DHO_NIS_DOMAIN:
                if (!res_hnok(sbuf)) {
                        warning("Bogus Host Name option %d: %s (%s)", option,
                            sbuf, opbuf);
                        return (0);
                }
                return (1);
        case DHO_PAD:
        case DHO_TIME_OFFSET:
        case DHO_BOOT_SIZE:
        case DHO_MERIT_DUMP:
        case DHO_ROOT_PATH:
        case DHO_EXTENSIONS_PATH:
        case DHO_IP_FORWARDING:
        case DHO_NON_LOCAL_SOURCE_ROUTING:
        case DHO_POLICY_FILTER:
        case DHO_MAX_DGRAM_REASSEMBLY:
        case DHO_DEFAULT_IP_TTL:
        case DHO_PATH_MTU_AGING_TIMEOUT:
        case DHO_PATH_MTU_PLATEAU_TABLE:
        case DHO_INTERFACE_MTU:
        case DHO_ALL_SUBNETS_LOCAL:
        case DHO_PERFORM_MASK_DISCOVERY:
        case DHO_MASK_SUPPLIER:
        case DHO_ROUTER_DISCOVERY:
        case DHO_ROUTER_SOLICITATION_ADDRESS:
        case DHO_STATIC_ROUTES:
        case DHO_TRAILER_ENCAPSULATION:
        case DHO_ARP_CACHE_TIMEOUT:
        case DHO_IEEE802_3_ENCAPSULATION:
        case DHO_DEFAULT_TCP_TTL:
        case DHO_TCP_KEEPALIVE_INTERVAL:
        case DHO_TCP_KEEPALIVE_GARBAGE:
        case DHO_VENDOR_ENCAPSULATED_OPTIONS:
        case DHO_NETBIOS_NODE_TYPE:
        case DHO_NETBIOS_SCOPE:
        case DHO_X_DISPLAY_MANAGER:
        case DHO_DHCP_REQUESTED_ADDRESS:
        case DHO_DHCP_LEASE_TIME:
        case DHO_DHCP_OPTION_OVERLOAD:
        case DHO_DHCP_MESSAGE_TYPE:
        case DHO_DHCP_PARAMETER_REQUEST_LIST:
        case DHO_DHCP_MESSAGE:
        case DHO_DHCP_MAX_MESSAGE_SIZE:
        case DHO_DHCP_RENEWAL_TIME:
        case DHO_DHCP_REBINDING_TIME:
        case DHO_DHCP_CLASS_IDENTIFIER:
        case DHO_DHCP_CLIENT_IDENTIFIER:
        case DHO_DHCP_USER_CLASS_ID:
        case DHO_END:
                return (1);
        default:
                warning("unknown dhcp option value 0x%x", option);
                return (unknown_ok);
        }
}

int
res_hnok(const char *dn)
{
        int pch = PERIOD, ch = *dn++;

        while (ch != '\0') {
                int nch = *dn++;

                if (periodchar(ch)) {
                        ;
                } else if (periodchar(pch)) {
                        if (!borderchar(ch))
                                return (0);
                } else if (periodchar(nch) || nch == '\0') {
                        if (!borderchar(ch))
                                return (0);
                } else {
                        if (!middlechar(ch))
                                return (0);
                }
                pch = ch, ch = nch;
        }
        return (1);
}

/* Does buf consist only of dotted decimal ipv4 addrs?
 * return how many if so,
 * otherwise, return 0
 */
int
ipv4addrs(char * buf)
{
    char *tmp;
    struct in_addr jnk;
    int i = 0;

    note("Input: %s", buf);

    do {
        tmp = strtok(buf, " ");
        note("got %s", tmp);
                if( tmp && inet_aton(tmp, &jnk) ) i++;
        buf = NULL;
    } while( tmp );

    return (i);
}


char *
option_as_string(unsigned int code, unsigned char *data, int len)
{
        static char optbuf[32768]; /* XXX */
        char *op = optbuf;
        int opleft = sizeof(optbuf);
        unsigned char *dp = data;

        if (code > 255)
                error("option_as_string: bad code %d", code);

        for (; dp < data + len; dp++) {
                if (!isascii(*dp) || !isprint(*dp)) {
                        if (dp + 1 != data + len || *dp != 0) {
                                _snprintf(op, opleft, "\\%03o", *dp);
                                op += 4;
                                opleft -= 4;
                        }
                } else if (*dp == '"' || *dp == '\'' || *dp == '$' ||
                    *dp == '`' || *dp == '\\') {
                        *op++ = '\\';
                        *op++ = *dp;
                        opleft -= 2;
                } else {
                        *op++ = *dp;
                        opleft--;
                }
        }
        if (opleft < 1)
                goto toobig;
        *op = 0;
        return optbuf;
toobig:
        warning("dhcp option too large");
        return "<error>";
}

#if 0
int
fork_privchld(int fd, int fd2)
{
        struct pollfd pfd[1];
        int nfds;

        switch (fork()) {
        case -1:
                error("cannot fork");
        case 0:
                break;
        default:
                return (0);
        }

        setproctitle("%s [priv]", ifi->name);

        dup2(nullfd, STDIN_FILENO);
        dup2(nullfd, STDOUT_FILENO);
        dup2(nullfd, STDERR_FILENO);
        close(nullfd);
        close(fd2);

        for (;;) {
                pfd[0].fd = fd;
                pfd[0].events = POLLIN;
                if ((nfds = poll(pfd, 1, INFTIM)) == -1)
                        if (errno != EINTR)
                                error("poll error");

                if (nfds == 0 || !(pfd[0].revents & POLLIN))
                        continue;

                dispatch_imsg(fd);
        }
}
#endif