Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-12-28 01:55:19 +00:00
Code Issues Projects Releases Packages Wiki Activity
reactos/base/services/dhcpcsvc/dhcp/dhclient.c
Eric Kohl 033b6639e4 [DHCPCSVC] Make the DHCP client service stoppable 
- Make all threads (pipe thread, adapter discovery thread and dispatcher thread) wait on the stop event.
- Close shared resources in the main (dispatcher) thread after the pipe thread and the adapter discovery thread have shut down.

This enables us to stop and restart the DHCP client properly.

CORE-14390
2021-08-08 14:10:25 +02:00

1992 lines
58 KiB
C
Raw Permalink Blame History

/* $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>
#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 */
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;
/*
* 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;
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;
int
init_client(void)
{
ApiInit();
AdapterInit();
tzset();
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;
bootp_packet_handler = do_packet;
return 1; // TRUE
}
void
stop_client(void)
{
// AdapterStop();
// ApiFree();
/* FIXME: Close pipe and kill pipe thread */
}
/* XXX Implement me */
int check_arp( struct interface_info *ip, struct client_lease *lp ) {
return 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;
time(&ip->client->first_sending);
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;
time(&ip->client->first_sending);
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;
time_t cur_time;
ASSERT_STATE(state, S_SELECTING);
time(&cur_time);
/* 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;
time_t cur_time;
time(&cur_time);
/* 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 = DHCP_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( PDHCP_ADAPTER Adapter, struct client_lease *new_lease ) {
CHAR Buffer[200] = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
HKEY RegKey;
strcat(Buffer, Adapter->DhclientInfo.name);
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, Buffer, 0, KEY_WRITE, &RegKey ) != ERROR_SUCCESS)
return;
if( new_lease->options[DHO_DOMAIN_NAME_SERVERS].len ) {
struct iaddr nameserver;
char *nsbuf;
int i, addrs =
new_lease->options[DHO_DOMAIN_NAME_SERVERS].len / sizeof(ULONG);
nsbuf = malloc( addrs * sizeof(IP_ADDRESS_STRING) );
if( nsbuf) {
nsbuf[0] = 0;
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));
RegSetValueExA( RegKey, "DhcpNameServer", 0, REG_SZ,
(LPBYTE)nsbuf, strlen(nsbuf) + 1 );
free( nsbuf );
}
} else {
RegDeleteValueW( RegKey, L"DhcpNameServer" );
}
RegCloseKey( RegKey );
}
void
set_domain(PDHCP_ADAPTER Adapter,
struct client_lease *new_lease)
{
CHAR Buffer1[MAX_PATH] = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
CHAR Buffer2[MAX_PATH] = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters";
HKEY RegKey1, RegKey2;
strcat(Buffer1, Adapter->DhclientInfo.name);
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, Buffer1, 0, KEY_WRITE, &RegKey1 ) != ERROR_SUCCESS)
{
return;
}
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, Buffer2, 0, KEY_WRITE, &RegKey2 ) != ERROR_SUCCESS)
{
RegCloseKey(RegKey1);
return;
}
if (new_lease->options[DHO_DOMAIN_NAME].len)
{
DH_DbgPrint(MID_TRACE, ("Setting DhcpDomain: %s\n", new_lease->options[DHO_DOMAIN_NAME].data));
RegSetValueExA(RegKey1,
"DhcpDomain",
0,
REG_SZ,
(LPBYTE)new_lease->options[DHO_DOMAIN_NAME].data,
new_lease->options[DHO_DOMAIN_NAME].len);
RegSetValueExA(RegKey2,
"DhcpDomain",
0,
REG_SZ,
(LPBYTE)new_lease->options[DHO_DOMAIN_NAME].data,
new_lease->options[DHO_DOMAIN_NAME].len);
}
else
{
RegDeleteValueW(RegKey1, L"DhcpDomain");
RegDeleteValueW(RegKey2, L"DhcpDomain");
}
RegCloseKey(RegKey1);
RegCloseKey(RegKey2);
}
void setup_adapter( PDHCP_ADAPTER Adapter, struct client_lease *new_lease ) {
CHAR Buffer[200] = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
struct iaddr netmask;
HKEY hkey;
int i;
DWORD dwEnableDHCP;
strcat(Buffer, Adapter->DhclientInfo.name);
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, Buffer, 0, KEY_WRITE, &hkey) != ERROR_SUCCESS)
hkey = NULL;
if( Adapter->NteContext )
{
DeleteIPAddress( Adapter->NteContext );
Adapter->NteContext = 0;
}
/* 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 (hkey) {
RegSetValueExA(hkey, "DhcpIPAddress", 0, REG_SZ, (LPBYTE)piaddr(new_lease->address), strlen(piaddr(new_lease->address))+1);
Buffer[0] = '\0';
for(i = 0; i < new_lease->options[DHO_SUBNET_MASK].len; i++)
{
sprintf(&Buffer[strlen(Buffer)], "%u", new_lease->options[DHO_SUBNET_MASK].data[i]);
if (i + 1 < new_lease->options[DHO_SUBNET_MASK].len)
strcat(Buffer, ".");
}
RegSetValueExA(hkey, "DhcpSubnetMask", 0, REG_SZ, (LPBYTE)Buffer, strlen(Buffer)+1);
dwEnableDHCP = 1;
RegSetValueExA(hkey, "EnableDHCP", 0, REG_DWORD, (LPBYTE)&dwEnableDHCP, sizeof(DWORD));
}
if( !NT_SUCCESS(Status) )
warning("AddIPAddress: %lx\n", Status);
}
if( new_lease->options[DHO_ROUTERS].len ) {
NTSTATUS Status;
Adapter->RouterMib.dwForwardDest = 0; /* Default route */
Adapter->RouterMib.dwForwardMask = 0;
Adapter->RouterMib.dwForwardMetric1 = 1;
Adapter->RouterMib.dwForwardIfIndex = Adapter->IfMib.dwIndex;
if( Adapter->RouterMib.dwForwardNextHop ) {
/* If we set a default route before, delete it before continuing */
DeleteIpForwardEntry( &Adapter->RouterMib );
}
Adapter->RouterMib.dwForwardNextHop =
*((ULONG*)new_lease->options[DHO_ROUTERS].data);
Status = CreateIpForwardEntry( &Adapter->RouterMib );
if( !NT_SUCCESS(Status) )
warning("CreateIpForwardEntry: %lx\n", Status);
if (hkey) {
Buffer[0] = '\0';
for(i = 0; i < new_lease->options[DHO_ROUTERS].len; i++)
{
sprintf(&Buffer[strlen(Buffer)], "%u", new_lease->options[DHO_ROUTERS].data[i]);
if (i + 1 < new_lease->options[DHO_ROUTERS].len)
strcat(Buffer, ".");
}
RegSetValueExA(hkey, "DhcpDefaultGateway", 0, REG_SZ, (LPBYTE)Buffer, strlen(Buffer)+1);
}
}
if (hkey)
RegCloseKey(hkey);
}
void
bind_lease(struct interface_info *ip)
{
PDHCP_ADAPTER Adapter;
struct client_lease *new_lease = ip->client->new;
time_t cur_time;
time(&cur_time);
/* Remember the medium. */
ip->client->new->medium = ip->client->medium;
/* Replace the old active lease with the new one. */
if (ip->client->active)
free_client_lease(ip->client->active);
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),
(long int)(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);
return;
}
set_name_servers( Adapter, new_lease );
set_domain( Adapter, new_lease );
}
/*
* 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;
time(&ip->client->first_sending);
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";
time_t cur_time;
time(&cur_time);
/* 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;
time_t cur_time;
DH_DbgPrint(MID_TRACE,("Doing discover on interface %p\n",ip));
time(&cur_time);
/* 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);
ip->client->first_sending = cur_time;
}
/* 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), (long int)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;
uint16_t address_low;
int i;
IPAddr IpAddress;
ULONG Buffer[20];
ULONG BufferSize;
DWORD ret;
PDHCP_ADAPTER Adapter = AdapterFindInfo(ip);
note("No DHCPOFFERS received.");
if (!Adapter->NteContext)
{
/* Generate an automatic private address */
DbgPrint("DHCPCSVC: Failed to receive a response from a DHCP server. An automatic private address will be assigned.\n");
/* FIXME: The address generation code sucks */
srand(0);
for (;;)
{
address_low = rand();
for (i = 0; i < ip->hw_address.hlen; i++)
address_low += ip->hw_address.haddr[i];
IpAddress = htonl(0xA9FE0000 | address_low); // 169.254.X.X
/* Send an ARP request to check if the IP address is already in use */
BufferSize = sizeof(Buffer);
ret = SendARP(IpAddress,
IpAddress,
Buffer,
&BufferSize);
DH_DbgPrint(MID_TRACE,("DHCPCSVC: SendARP returned %lu\n", ret));
if (ret != 0)
{
/* The IP address is not in use */
DH_DbgPrint(MID_TRACE,("DHCPCSVC: Using automatic private address\n"));
AddIPAddress(IpAddress,
htonl(0xFFFF0000), // 255.255.0.0
Adapter->IfMib.dwIndex,
&Adapter->NteContext,
&Adapter->NteInstance);
return;
}
}
}
}
void
send_request(void *ipp)
{
struct interface_info *ip = ipp;
struct sockaddr_in destination;
struct in_addr from;
int interval;
time_t cur_time;
time(&cur_time);
/* 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 ) {
/* 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 );
Adapter->NteContext = 0;
}
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);
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);
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);
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(struct interface_info *ifi)
{
struct client_lease *lp;
if (!leaseFile) {
leaseFile = fopen(path_dhclient_db, "w");
if (!leaseFile)
error("can't create %s", 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(ip);
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", path_dhclient_db);
return;
}
}
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);
if (t)
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);
if (t)
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);
if (t)
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
priv_script_init(struct interface_info *ip, char *reason, char *medium)
{
if (ip) {
// XXX Do we need to do anything?
}
}
void
priv_script_write_params(struct interface_info *ip, char *prefix, struct client_lease *lease)
{
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 + 1;
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-1] = '\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
}
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 (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>";
}
Reference in a new issue View git blame Copy permalink