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Ted Lemon 1997-02-22 12:56:43 +00:00
parent 94db3c801c
commit 034aa896ce
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334
bootp.c
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@ -1,334 +0,0 @@
/* bootp.c
BOOTP Protocol support. */
/*
* Copyright (c) 1995, 1996 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''.
*/
#ifndef lint
static char copyright[] =
"$Id: bootp.c,v 1.24 1997/02/22 08:36:36 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
void bootp (packet)
struct packet *packet;
{
int result;
struct host_decl *hp;
struct host_decl *host = (struct host_decl *)0;
struct packet outgoing;
struct dhcp_packet raw;
struct sockaddr_in to;
struct in_addr from;
struct hardware hto;
struct tree_cache *options [256];
struct subnet *subnet;
struct lease *lease;
struct iaddr ip_address;
int i;
note ("BOOTREQUEST from %s via %s",
print_hw_addr (packet -> raw -> htype,
packet -> raw -> hlen,
packet -> raw -> chaddr),
packet -> raw -> giaddr.s_addr
? inet_ntoa (packet -> raw -> giaddr)
: packet -> interface -> name);
if (!locate_network (packet))
return;
hp = find_hosts_by_haddr (packet -> raw -> htype,
packet -> raw -> chaddr,
packet -> raw -> hlen);
lease = find_lease (packet, packet -> shared_network);
/* Find an IP address in the host_decl that matches the
specified network. */
if (hp)
subnet = find_host_for_network (&hp, &ip_address,
packet -> shared_network);
else
subnet = (struct subnet *)0;
if (!subnet) {
/* We didn't find an applicable host declaration.
Just in case we may be able to dynamically assign
an address, see if there's a host declaration
that doesn't have an ip address associated with it. */
if (hp) {
for (; hp; hp = hp -> n_ipaddr) {
if (!hp -> fixed_addr) {
host = hp;
break;
}
}
}
if (host && (!host -> group -> allow_booting)) {
note ("Ignoring excluded BOOTP client %s",
host -> name);
return;
}
if (host && (!host -> group -> allow_bootp)) {
note ("Ignoring BOOTP request from client %s",
host -> name);
return;
}
/* If we've been told not to boot unknown clients,
and we didn't find any host record for this client,
ignore it. */
if (!host && !(packet -> shared_network ->
group -> boot_unknown_clients)) {
note ("Ignoring unknown BOOTP client %s via %s",
print_hw_addr (packet -> raw -> htype,
packet -> raw -> hlen,
packet -> raw -> chaddr),
packet -> raw -> giaddr.s_addr
? inet_ntoa (packet -> raw -> giaddr)
: packet -> interface -> name);
return;
}
/* If we've been told not to boot with bootp on this
network, ignore it. */
if (!host &&
!(packet -> shared_network -> group -> allow_bootp)) {
note ("Ignoring BOOTP request from client %s via %s",
print_hw_addr (packet -> raw -> htype,
packet -> raw -> hlen,
packet -> raw -> chaddr),
packet -> raw -> giaddr.s_addr
? inet_ntoa (packet -> raw -> giaddr)
: packet -> interface -> name);
return;
}
/* If the packet is from a host we don't know and there
are no dynamic bootp addresses on the network it came
in on, drop it on the floor. */
if (!(packet -> shared_network -> group -> dynamic_bootp)) {
lose:
note ("No applicable record for BOOTP host %s via %s",
print_hw_addr (packet -> raw -> htype,
packet -> raw -> hlen,
packet -> raw -> chaddr),
packet -> raw -> giaddr.s_addr
? inet_ntoa (packet -> raw -> giaddr)
: packet -> interface -> name);
return;
}
/* If a lease has already been assigned to this client
and it's still okay to use dynamic bootp on
that lease, reassign it. */
if (lease) {
/* If this lease can be used for dynamic bootp,
do so. */
if ((lease -> flags & DYNAMIC_BOOTP_OK)) {
/* If it's not a DYNAMIC_BOOTP lease,
release it before reassigning it
so that we don't get a lease
conflict. */
if (!(lease -> flags & BOOTP_LEASE))
release_lease (lease);
lease -> host = host;
ack_lease (packet, lease, 0, 0);
return;
}
/* If dynamic BOOTP is no longer allowed for
this lease, set it free. */
release_lease (lease);
}
/* If there are dynamic bootp addresses that might be
available, try to snag one. */
for (lease = packet -> shared_network -> last_lease;
lease && lease -> ends <= cur_time;
lease = lease -> prev) {
if ((lease -> flags & DYNAMIC_BOOTP_OK)) {
lease -> host = host;
ack_lease (packet, lease, 0, 0);
return;
}
}
goto lose;
}
/* Make sure we're allowed to boot this client. */
if (hp && (!hp -> group -> allow_booting)) {
note ("Ignoring excluded BOOTP client %s",
hp -> name);
return;
}
/* Make sure we're allowed to boot this client with bootp. */
if (hp && (!hp -> group -> allow_bootp)) {
note ("Ignoring BOOTP request from client %s",
hp -> name);
return;
}
/* Set up the outgoing packet... */
memset (&outgoing, 0, sizeof outgoing);
memset (&raw, 0, sizeof raw);
outgoing.raw = &raw;
/* Come up with a list of options that we want to send to this
client. Start with the per-subnet options, and then override
those with client-specific options. */
memcpy (options, subnet -> group -> options, sizeof options);
for (i = 0; i < 256; i++) {
if (hp -> group -> options [i])
options [i] = hp -> group -> options [i];
}
/* Pack the options into the buffer. Unlike DHCP, we can't
pack options into the filename and server name buffers. */
outgoing.packet_length =
cons_options (packet, outgoing.raw, options, 0, 0);
if (outgoing.packet_length < BOOTP_MIN_LEN)
outgoing.packet_length = BOOTP_MIN_LEN;
/* Take the fields that we care about... */
raw.op = BOOTREPLY;
raw.htype = packet -> raw -> htype;
raw.hlen = packet -> raw -> hlen;
memcpy (raw.chaddr, packet -> raw -> chaddr, raw.hlen);
memset (&raw.chaddr [raw.hlen], 0,
(sizeof raw.chaddr) - raw.hlen);
raw.hops = packet -> raw -> hops;
raw.xid = packet -> raw -> xid;
raw.secs = packet -> raw -> secs;
raw.flags = 0;
raw.ciaddr = packet -> raw -> ciaddr;
memcpy (&raw.yiaddr, ip_address.iabuf, sizeof raw.yiaddr);
/* Figure out the address of the next server. */
if (hp && hp -> group -> next_server.len)
memcpy (&raw.siaddr, hp -> group -> next_server.iabuf, 4);
else if (subnet -> group -> next_server.len)
memcpy (&raw.siaddr, subnet -> group -> next_server.iabuf, 4);
else if (subnet -> interface_address.len)
memcpy (&raw.siaddr, subnet -> interface_address.iabuf, 4);
else
raw.siaddr = packet -> interface -> primary_address;
raw.giaddr = packet -> raw -> giaddr;
if (hp -> group -> server_name) {
strncpy (raw.sname, hp -> group -> server_name,
(sizeof raw.sname) - 1);
raw.sname [(sizeof raw.sname) - 1] = 0;
}
if (hp -> group -> filename) {
strncpy (raw.file, hp -> group -> filename,
(sizeof raw.file) - 1);
raw.file [(sizeof raw.file) - 1] = 0;
}
/* Set up the hardware destination address... */
hto.htype = packet -> raw -> htype;
hto.hlen = packet -> raw -> hlen;
memcpy (hto.haddr, packet -> raw -> chaddr, hto.hlen);
from = packet -> interface -> primary_address;
/* Report what we're doing... */
note ("BOOTREPLY for %s to %s (%s) via %s",
piaddr (ip_address), hp -> name,
print_hw_addr (packet -> raw -> htype,
packet -> raw -> hlen,
packet -> raw -> chaddr),
packet -> raw -> giaddr.s_addr
? inet_ntoa (packet -> raw -> giaddr)
: packet -> interface -> name);
/* Set up the parts of the address that are in common. */
to.sin_family = AF_INET;
#ifdef HAVE_SA_LEN
to.sin_len = sizeof to;
#endif
memset (to.sin_zero, 0, sizeof to.sin_zero);
/* If this was gatewayed, send it back to the gateway... */
if (raw.giaddr.s_addr) {
to.sin_addr = raw.giaddr;
to.sin_port = local_port;
#ifdef USE_FALLBACK
result = send_fallback (&fallback_interface,
(struct packet *)0,
&raw, outgoing.packet_length,
from, &to, &hto);
if (result < 0)
warn ("send_fallback: %m");
return;
#endif
/* Otherwise, broadcast it on the local network. */
} else {
to.sin_addr.s_addr = INADDR_BROADCAST;
to.sin_port = remote_port; /* XXX */
}
errno = 0;
result = send_packet (packet -> interface,
packet, &raw, outgoing.packet_length,
from, &to, &hto);
if (result < 0)
warn ("send_packet: %m");
}
void relay (ip, packet, length)
struct interface_info *ip;
struct dhcp_packet *packet;
int length;
{
}

521
conflex.c
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@ -1,521 +0,0 @@
/* conflex.c
Lexical scanner for dhcpd config file... */
/*
* Copyright (c) 1995, 1996, 1997 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''.
*/
#ifndef lint
static char copyright[] =
"$Id: conflex.c,v 1.22 1997/02/22 12:23:40 mellon Exp $ Copyright (c) 1995, 1996, 1997 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
#include "dhctoken.h"
#include <ctype.h>
int lexline;
int lexchar;
char *token_line;
char *prev_line;
char *cur_line;
char *tlname;
static char line1 [81];
static char line2 [81];
static int lpos;
static int line;
static int tlpos;
static int tline;
static int token;
static int ugflag;
static char *tval;
static char tokbuf [1500];
#ifdef OLD_LEXER
char comments [4096];
int comment_index;
#endif
static int get_char PROTO ((FILE *));
static int get_token PROTO ((FILE *));
static void skip_to_eol PROTO ((FILE *));
static int read_string PROTO ((FILE *));
static int read_number PROTO ((int, FILE *));
static int read_num_or_name PROTO ((int, FILE *));
static int intern PROTO ((char *, int));
void new_parse (name)
char *name;
{
tlname = name;
lpos = line = 1;
cur_line = line1;
prev_line = line2;
token_line = cur_line;
cur_line [0] = prev_line [0] = 0;
warnings_occurred = 0;
}
static int get_char (cfile)
FILE *cfile;
{
int c = getc (cfile);
if (!ugflag) {
if (c == EOL) {
if (cur_line == line1) {
cur_line = line2;
prev_line = line1;
} else {
cur_line = line2;
prev_line = line1;
}
line++;
lpos = 1;
cur_line [0] = 0;
} else if (c != EOF) {
if (lpos <= 81) {
cur_line [lpos - 1] = c;
cur_line [lpos] = 0;
}
lpos++;
}
} else
ugflag = 0;
return c;
}
static int get_token (cfile)
FILE *cfile;
{
int c;
int ttok;
static char tb [2];
int l, p, u;
do {
l = line;
p = lpos;
u = ugflag;
c = get_char (cfile);
#ifdef OLD_LEXER
if (c == '\n' && p == 1 && !u
&& comment_index < sizeof comments)
comments [comment_index++] = '\n';
#endif
if (isascii (c) && isspace (c))
continue;
if (c == '#') {
#ifdef OLD_LEXER
if (comment_index < sizeof comments)
comments [comment_index++] = '#';
#endif
skip_to_eol (cfile);
continue;
}
if (c == '"') {
lexline = l;
lexchar = p;
ttok = read_string (cfile);
break;
}
if ((isascii (c) && isdigit (c)) || c == '-') {
lexline = l;
lexchar = p;
ttok = read_number (c, cfile);
break;
} else if (isascii (c) && isalpha (c)) {
lexline = l;
lexchar = p;
ttok = read_num_or_name (c, cfile);
break;
} else {
lexline = l;
lexchar = p;
tb [0] = c;
tb [1] = 0;
tval = tb;
ttok = c;
break;
}
} while (1);
return ttok;
}
int next_token (rval, cfile)
char **rval;
FILE *cfile;
{
int rv;
if (token) {
if (lexline != tline)
token_line = cur_line;
lexchar = tlpos;
lexline = tline;
rv = token;
token = 0;
} else {
rv = get_token (cfile);
token_line = cur_line;
}
if (rval)
*rval = tval;
#ifdef DEBUG_TOKENS
fprintf (stderr, "%s:%d ", tval, rv);
#endif
return rv;
}
int peek_token (rval, cfile)
char **rval;
FILE *cfile;
{
int x;
if (!token) {
tlpos = lexchar;
tline = lexline;
token = get_token (cfile);
if (lexline != tline)
token_line = prev_line;
x = lexchar; lexchar = tlpos; tlpos = x;
x = lexline; lexline = tline; tline = x;
}
if (rval)
*rval = tval;
#ifdef DEBUG_TOKENS
fprintf (stderr, "(%s:%d) ", tval, token);
#endif
return token;
}
static void skip_to_eol (cfile)
FILE *cfile;
{
int c;
do {
c = get_char (cfile);
if (c == EOF)
return;
#ifdef OLD_LEXER
if (comment_index < sizeof (comments))
comments [comment_index++] = c;
#endif
if (c == EOL) {
return;
}
} while (1);
}
static int read_string (cfile)
FILE *cfile;
{
int i;
int bs = 0;
int c;
for (i = 0; i < sizeof tokbuf; i++) {
c = get_char (cfile);
if (c == EOF) {
parse_warn ("eof in string constant");
break;
}
if (bs) {
bs = 0;
tokbuf [i] = c;
} else if (c == '\\')
bs = 1;
else if (c == '"')
break;
else
tokbuf [i] = c;
}
/* Normally, I'd feel guilty about this, but we're talking about
strings that'll fit in a DHCP packet here... */
if (i == sizeof tokbuf) {
parse_warn ("string constant larger than internal buffer");
--i;
}
tokbuf [i] = 0;
tval = tokbuf;
return STRING;
}
static int read_number (c, cfile)
int c;
FILE *cfile;
{
int seenx = 0;
int i = 0;
int token = NUMBER;
tokbuf [i++] = c;
for (; i < sizeof tokbuf; i++) {
c = get_char (cfile);
if (!seenx && c == 'x') {
seenx = 1;
#ifndef OLD_LEXER
} else if (isascii (c) && !isxdigit (c) &&
(c == '-' || c == '_' || isalpha (c))) {
token = NAME;
} else if (isascii (c) && !isdigit (c) && isxdigit (c)) {
token = NUMBER_OR_NAME;
#endif
} else if (!isascii (c) || !isxdigit (c)) {
ungetc (c, cfile);
ugflag = 1;
break;
}
tokbuf [i] = c;
}
if (i == sizeof tokbuf) {
parse_warn ("numeric token larger than internal buffer");
--i;
}
tokbuf [i] = 0;
tval = tokbuf;
return token;
}
static int read_num_or_name (c, cfile)
int c;
FILE *cfile;
{
int i = 0;
int rv = NUMBER_OR_NAME;
tokbuf [i++] = c;
for (; i < sizeof tokbuf; i++) {
c = get_char (cfile);
if (!isascii (c) ||
(c != '-' && c != '_' && !isalnum (c))) {
ungetc (c, cfile);
ugflag = 1;
break;
}
if (!isxdigit (c))
rv = NAME;
tokbuf [i] = c;
}
if (i == sizeof tokbuf) {
parse_warn ("token larger than internal buffer");
--i;
}
tokbuf [i] = 0;
tval = tokbuf;
return intern (tval, rv);
}
static int intern (atom, dfv)
char *atom;
int dfv;
{
if (!isascii (atom [0]))
return dfv;
switch (tolower (atom [0])) {
case 'a':
if (!strcasecmp (atom + 1, "llow"))
return ALLOW;
if (!strcasecmp (atom + 1, "lias"))
return ALIAS;
break;
case 'b':
if (!strcasecmp (atom + 1, "ootp"))
return BOOTP;
if (!strcasecmp (atom + 1, "ooting"))
return BOOTING;
if (!strcasecmp (atom + 1, "oot-unknown-clients"))
return BOOT_UNKNOWN_CLIENTS;
case 'c':
if (!strcasecmp (atom + 1, "lass"))
return CLASS;
if (!strcasecmp (atom + 1, "iaddr"))
return CIADDR;
if (!strcasecmp (atom + 1, "lient-identifier"))
return CLIENT_IDENTIFIER;
break;
case 'd':
if (!strcasecmp (atom + 1, "eny"))
return DENY;
if (!strncasecmp (atom + 1, "efault", 6)) {
if (!atom [7])
return DEFAULT;
if (!strcasecmp (atom + 7, "-lease-time"))
return DEFAULT_LEASE_TIME;
break;
}
if (!strncasecmp (atom + 1, "ynamic-bootp", 12)) {
if (!atom [13])
return DYNAMIC_BOOTP;
if (!strcasecmp (atom + 13, "-lease-cutoff"))
return DYNAMIC_BOOTP_LEASE_CUTOFF;
if (!strcasecmp (atom + 13, "-lease-length"))
return DYNAMIC_BOOTP_LEASE_LENGTH;
break;
}
break;
case 'e':
if (!strcasecmp (atom + 1, "thernet"))
return ETHERNET;
if (!strcasecmp (atom + 1, "nds"))
return ENDS;
if (!strcasecmp (atom + 1, "xpire"))
return EXPIRE;
break;
case 'f':
if (!strcasecmp (atom + 1, "ilename"))
return FILENAME;
if (!strcasecmp (atom + 1, "ixed-address"))
return FIXED_ADDR;
break;
case 'g':
if (!strcasecmp (atom + 1, "iaddr"))
return GIADDR;
if (!strcasecmp (atom + 1, "roup"))
return GROUP;
if (!strcasecmp (atom + 1, "et-lease-hostnames"))
return GET_LEASE_HOSTNAMES;
break;
case 'h':
if (!strcasecmp (atom + 1, "ost"))
return HOST;
if (!strcasecmp (atom + 1, "ardware"))
return HARDWARE;
break;
case 'i':
if (!strcasecmp (atom + 1, "nterface"))
return INTERFACE;
break;
case 'l':
if (!strcasecmp (atom + 1, "ease"))
return LEASE;
break;
case 'm':
if (!strcasecmp (atom + 1, "ax-lease-time"))
return MAX_LEASE_TIME;
if (!strncasecmp (atom + 1, "edi", 3)) {
if (!strcasecmp (atom + 4, "a"))
return MEDIA;
if (!strcasecmp (atom + 4, "um"))
return MEDIUM;
break;
}
break;
case 'n':
if (!strcasecmp (atom + 1, "etmask"))
return NETMASK;
if (!strcasecmp (atom + 1, "ext-server"))
return NEXT_SERVER;
break;
case 'o':
if (!strcasecmp (atom + 1, "ption"))
return OPTION;
if (!strcasecmp (atom + 1, "ne-lease-per-client"))
return ONE_LEASE_PER_CLIENT;
break;
case 'p':
if (!strcasecmp (atom + 1, "acket"))
return PACKET;
break;
case 'r':
if (!strcasecmp (atom + 1, "ange"))
return RANGE;
if (!strcasecmp (atom + 1, "equest"))
return REQUEST;
if (!strcasecmp (atom + 1, "equire"))
return REQUIRE;
if (!strcasecmp (atom + 1, "etry"))
return RETRY;
if (!strcasecmp (atom + 1, "enew"))
return RENEW;
if (!strcasecmp (atom + 1, "ebind"))
return REBIND;
break;
case 's':
if (!strcasecmp (atom + 1, "tarts"))
return STARTS;
if (!strcasecmp (atom + 1, "iaddr"))
return SIADDR;
if (!strcasecmp (atom + 1, "ubnet"))
return SUBNET;
if (!strcasecmp (atom + 1, "hared-network"))
return SHARED_NETWORK;
if (!strcasecmp (atom + 1, "erver-name"))
return SERVER_NAME;
if (!strcasecmp (atom + 1, "erver-identifier"))
return SERVER_IDENTIFIER;
if (!strcasecmp (atom + 1, "elect-timeout"))
return SELECT_TIMEOUT;
if (!strcasecmp (atom + 1, "end"))
return SEND;
if (!strcasecmp (atom + 1, "cript"))
return SCRIPT;
break;
case 't':
if (!strcasecmp (atom + 1, "imestamp"))
return TIMESTAMP;
if (!strcasecmp (atom + 1, "imeout"))
return TIMEOUT;
if (!strcasecmp (atom + 1, "oken-ring"))
return TOKEN_RING;
break;
case 'u':
if (!strcasecmp (atom + 1, "id"))
return UID;
if (!strcasecmp (atom + 1, "ser-class"))
return USER_CLASS;
if (!strcasecmp (atom + 1, "se-host-decl-names"))
return USE_HOST_DECL_NAMES;
if (!strcasecmp (atom + 1, "nknown-clients"))
return UNKNOWN_CLIENTS;
break;
case 'v':
if (!strcasecmp (atom + 1, "endor-class"))
return VENDOR_CLASS;
break;
case 'y':
if (!strcasecmp (atom + 1, "iaddr"))
return YIADDR;
break;
}
return dfv;
}

212
db.c
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@ -1,212 +0,0 @@
/* db.c
Persistent database management routines for DHCPD... */
/*
* Copyright (c) 1995, 1996 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''.
*/
#ifndef lint
static char copyright[] =
"$Id: db.c,v 1.8 1996/09/02 21:16:24 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
FILE *db_file;
static int counting = 0;
static int count = 0;
TIME write_time;
/* Write the specified lease to the current lease database file. */
int write_lease (lease)
struct lease *lease;
{
struct tm *t;
char tbuf [64];
int errors = 0;
if (counting)
++count;
errno = 0;
fprintf (db_file, "lease %s {\n", piaddr (lease -> ip_addr));
if (errno) {
++errors;
}
t = gmtime (&lease -> starts);
sprintf (tbuf, "%d %d/%d/%d %02d:%02d:%02d;",
t -> tm_wday, t -> tm_year + 1900,
t -> tm_mon + 1, t -> tm_mday,
t -> tm_hour, t -> tm_min, t -> tm_sec);
errno = 0;
fprintf (db_file, "\tstarts %s\n", tbuf);
if (errno) {
++errors;
}
t = gmtime (&lease -> ends);
sprintf (tbuf, "%d %d/%d/%d %02d:%02d:%02d;",
t -> tm_wday, t -> tm_year + 1900,
t -> tm_mon + 1, t -> tm_mday,
t -> tm_hour, t -> tm_min, t -> tm_sec);
errno = 0;
fprintf (db_file, "\tends %s", tbuf);
if (errno) {
++errors;
}
if (lease -> hardware_addr.hlen) {
errno = 0;
fprintf (db_file, "\n\thardware %s %s;",
hardware_types [lease -> hardware_addr.htype],
print_hw_addr (lease -> hardware_addr.htype,
lease -> hardware_addr.hlen,
lease -> hardware_addr.haddr));
if (errno) {
++errors;
}
}
if (lease -> uid_len) {
int i;
errno = 0;
fprintf (db_file, "\n\tuid %x", lease -> uid [0]);
if (errno) {
++errors;
}
for (i = 1; i < lease -> uid_len; i++) {
errno = 0;
fprintf (db_file, ":%x", lease -> uid [i]);
if (errno) {
++errors;
}
}
putc (';', db_file);
}
if (lease -> flags & BOOTP_LEASE) {
errno = 0;
fprintf (db_file, "\n\tdynamic-bootp;");
if (errno) {
++errors;
}
}
errno = 0;
fputs ("\n}\n", db_file);
if (errno) {
++errors;
}
if (errors)
note ("write_lease: unable to write lease %s",
piaddr (lease -> ip_addr));
return !errors;
}
/* Commit any leases that have been written out... */
int commit_leases ()
{
/* Commit any outstanding writes to the lease database file.
We need to do this even if we're rewriting the file below,
just in case the rewrite fails. */
if (fflush (db_file) == EOF) {
note ("commit_leases: unable to commit: %m");
return 0;
}
if (fsync (fileno (db_file)) < 0) {
note ("commit_leases: unable to commit: %m");
return 0;
}
/* If we've written more than a thousand leases or if
we haven't rewritten the lease database in over an
hour, rewrite it now. */
if (count > 1000 || (count && cur_time - write_time > 3600)) {
count = 0;
write_time = cur_time;
new_lease_file ();
}
return 1;
}
void db_startup ()
{
/* Read in the existing lease file... */
read_leases ();
new_lease_file ();
}
void new_lease_file ()
{
char newfname [512];
char backfname [512];
TIME t;
/* If we already have an open database, close it. */
if (db_file) {
fclose (db_file);
}
/* Make a temporary lease file... */
time (&t);
sprintf (newfname, "%s.%d", path_dhcpd_db, (int) (t & 32767));
if ((db_file = fopen (newfname, "w")) == NULL) {
error ("Can't start new lease file: %m");
}
/* Write out all the leases that we know of... */
counting = 0;
write_leases ();
/* Get the old database out of the way... */
sprintf (backfname, "%s~", path_dhcpd_db);
if (unlink (backfname) < 0 && errno != ENOENT)
error ("Can't remove old lease database backup %s: %m",
backfname);
if (link (path_dhcpd_db, backfname) < 0)
error ("Can't backup lease database %s to %s: %m",
path_dhcpd_db, backfname);
/* Move in the new file... */
if (rename (newfname, path_dhcpd_db) < 0)
error ("Can't install new lease database %s to %s: %m",
newfname, path_dhcpd_db);
counting = 1;
}

1158
dhcp.c
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308
dhcpd.8
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@ -1,308 +0,0 @@
.\" dhcpd.8
.\"
.\" Copyright (c) 1995, 1996 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.isc.org/isc''. To learn more about Vixie
.\" Enterprises, see ``http://www.vix.com''.
.TH dhcpd 8
.SH NAME
dhcpd - Dynamic Host Configuration Protocol Server
.SH SYNOPSIS
.B dhcpd
[
.B -p
.I port
]
[
.B -f
]
[
.B -d
]
[
.B -cf
.I config-file
]
[
.B -lf
.I lease-file
]
[
.I if0
[
.I ...ifN
]
]
.SH DESCRIPTION
The Internet Software Consortium DHCP Server, dhcpd, implements the
Dynamic Host Configuration Protocol (DHCP) and the Internet Bootstrap
Protocol (BOOTP). DHCP allows hosts on a TCP/IP network to request
and be assigned IP addresses, and also to discover information about
the network to which they are attached. BOOTP provides similar
functionality, with certain restrictions.
.SH OPERATION
.PP
The DHCP protocol allows a host which is unknown to the network
administrator to be automatically assigned a new IP address out of a
pool of IP addresses for its network. In order for this to work, the
network administrator allocates address pools in each subnet and
enters them into the dhcpd.conf(5) file.
.PP
On startup, dhcpd reads the
.IR dhcpd.conf
file and stores a list of available addresses on each subnet in
memory. When a client requests an address using the DHCP protocol,
dhcpd allocates an address for it. Each client is assigned a lease,
which expires after an amount of time chosen by the administrator (by
default, one day). Before leases expire, the clients to which leases
are assigned are expected to renew them in order to continue to use
the addresses. Once a lease has expired, the client to which that
lease was assigned is no longer permitted to use the leased IP
address.
.PP
In order to keep track of leases across system reboots and server
restarts, dhcpd keeps a list of leases it has assigned in the
dhcpd.leases(5) file. Before dhcpd grants a lease to a host, it
records the lease in this file and makes sure that the contents of the
file are flushed to disk. This ensures that even in the event of a
system crash, dhcpd will not forget about a lease that it has
assigned. On startup, after reading the dhcpd.conf file, dhcpd
reads the dhcpd.leases file to refresh its memory about what leases
have been assigned.
.PP
New leases are appended to the end of the dhcpd.leases
file. In order to prevent the file from becoming arbitrarily large,
from time to time dhcpd creates a new dhcpd.leases file from its
in-core lease database. Once this file has been written to disk, the
old file is renamed
.IR dhcpd.leases~ ,
and the new file is renamed dhcpd.leases. If the system crashes in
the middle of this process, whichever dhcpd.leases file remains will
contain all the lease information, so there is no need for a special
crash recovery process.
.PP
BOOTP support is also provided by this server. Unlike DHCP, the BOOTP
protocol does not provide a protocol for recovering
dynamically-assigned addresses once they are no longer needed. It is
still possible to dynamically assign addresses to BOOTP clients, but
some administrative process for reclaiming addresses is required. By
default, leases are granted to BOOTP clients in perpetuity, although
the network administrator may set an earlier cutoff date or a shorter
lease length for BOOTP leases if that makes sense.
.PP
BOOTP clients may also be served in the old standard way, which is to
simply provide a declaration in the dhcpd.conf file for each
BOOTP client, permanently assigning an address to each client.
.PP
Whenever changes are made to the dhcpd.conf file, dhcpd must be
restarted. To restart dhcpd, send a SIGTERM (signal 15) to the
process ID contained in
.IR RUNDIR/dhcpd.pid ,
and then re-invoke dhcpd. Because the DHCP server database is not as
lightweight as a BOOTP database, dhcpd does not automatically restart
itself when it sees a change to the dhcpd.conf file.
.SH COMMAND LINE
.PP
The names of the network interfaces on which dhcpd should listen for
broadcasts may be specified on the command line. This should be done
on systems where dhcpd is unable to identify non-broadcast interfaces,
but should not be required on other systems. If no interface names
are specified on the command line dhcpd will identify all network
interfaces which are up, elimininating non-broadcast interfaces if
possible, and listen for DHCP broadcasts on each interface.
.PP
If dhcpd should listen on a port other than the standard (port 67),
the
.B -p
flag may used. It should be followed by the udp port number on which
dhcpd should listen. This is mostly useful for debugging purposes.
.PP
To run dhcpd as a foreground process, rather than allowing it to run
as a daemon in the background, the
.B -f
flag should be specified. This is useful when running dhcpd under a
debugger, or when running it out of inittab on System V systems.
.PP
To have dhcpd log to the standard error descriptor, specify the
.B -d
flag. This can be useful for debugging, and also at sites where a
complete log of all dhcp activity must be kept but syslogd is not
reliable or otherwise cannot be used. Normally, dhcpd will log all
output using the syslog(3) function with the log facility set to
LOG_DAEMON.
.PP
Dhcpd can be made to use an alternate configuration file with the
.B -cf
flag, or an alternate lease file with the
.B -lf
flag. Because of the importance of using the same lease database at
all times when running dhcpd in production, these options should be
used \fBonly\fR for testing lease files or database files in a
non-production environment.
.SH CONFIGURATION
The syntax of the dhcpd.conf(8) file is discussed seperately. This
section should be used as an overview of the configuration process,
and the dhcpd.conf(8) documentation should be consulted for detailed
reference information.
.PP
.SH Subnets
dhcpd needs to know the subnet numbers and netmasks of all subnets for
which it will be providing service. In addition, in order to
dynamically allocate addresses, it must be assigned one or more ranges
of addresses on each subnet which it can in turn assign to client
hosts as they boot. Thus, a very simple configuration providing DHCP
support might look like this:
.nf
.sp 1
subnet 239.252.197.0 netmask 255.255.255.0 {
range 239.252.197.10 239.252.197.250;
}
.fi
.PP
Multiple address ranges may be specified like this:
.nf
.sp 1
subnet 239.252.197.0 netmask 255.255.255.0 {
range 239.252.197.10 239.252.197.107;
range 239.252.197.113 239.252.197.250;
}
.fi
.PP
If a subnet will only be provided with BOOTP service and no dynamic
address assignment, the range clause can be left out entirely, but the
subnet statement must appear.
.PP
.SH Lease Lengths
DHCP leases can be assigned almost any length from zero seconds to
infinity. What lease length makes sense for any given subnet, or for
any given installation, will vary depending on the kinds of hosts
being served.
.PP
For example, in an office environment where systems are added from
time to time and removed from time to time, but move relatively
infrequently, it might make sense to allow lease times of a month of
more. In a final test environment on a manufacturing floor, it may
make more sense to assign a maximum lease length of 30 minutes -
enough time to go through a simple test procedure on a network
appliance before packaging it up for delivery.
.PP
It is possible to specify two lease lengths: the default length that
will be assigned if a client doesn't ask for any particular lease
length, and a maximum lease length. These are specified as clauses
to the subnet command:
.nf
.sp 1
subnet 239.252.197.0 netmask 255.255.255.0 {
range 239.252.197.10 239.252.197.107;
default-lease-time 600;
max-lease-time 7200;
|
.fi
.PP
This particular subnet declaration specifies a default lease time of
600 seconds (ten minutes), and a maximum lease time of 7200 seconds
(two hours). Other common values would be 86400 (one day), 604800
(one week) and 2592000 (30 days).
.PP
Each subnet need not have the same lease\(emin the case of an office
environment and a manufacturing environment served by the same DHCP
server, it might make sense to have widely disparate values for
default and maximum lease times on each subnet.
.SH BOOTP Support
Each BOOTP client must be explicitly declared in the dhcpd.conf
file. A very basic client declaration will specify the client
network interface's hardware address and the IP address to assign to
that client. If the client needs to be able to load a boot file from
the server, that file's name must be specified. A simple bootp
client declaration might look like this:
.nf
.sp 1
host haagen {
hardware ethernet 08:00:2b:4c:59:23;
fixed-address 239.252.197.9;
filename "/tftpboot/haagen.boot";
}
.fi
.SH Options
DHCP (and also BOOTP with Vendor Extensions) provide a mechanism
whereby the server can provide the client with information about how
to configure its network interface (e.g., subnet mask), and also how
the client can access various network services (e.g., DNS, IP routers,
and so on).
.PP
These options can be specified on a per-subnet basis, and, for BOOTP
clients, also on a per-client basis. In the event that a BOOTP
client declaration specifies options that are also specified in its
subnet declaration, the options specified in the client declaration
take precedence. An reasonably complete DHCP configuration might
look something like this:
.nf
.sp 1
subnet 239.252.197.0 netmask 255.255.255.0 {
range 239.252.197.10 239.252.197.250;
default-lease-time 600 max-lease-time 7200;
option subnet-mask 255.255.255.0;
option broadcast-address 239.252.197.255;
option routers 239.252.197.1;
option domain-name-servers 239.252.197.2, 239.252.197.3;
option domain-name "isc.org";
}
.fi
.PP
A bootp host on that subnet that needs to be in a different domain and
use a different name server might be declared as follows:
.nf
.sp 1
host haagen hardware ethernet 08:00:2b:4c:59:23 {
fixed-address 239.252.197.9;
filename "/tftpboot/haagen.boot";
option domain-name-servers 192.5.5.1;
option domain-name "vix.com";
}
.fi
.PP
A more complete description of the dhcpd.conf file syntax is provided
in dhcpd.conf(5).
.SH FILES
.B ETCDIR/dhcpd.conf, DBDIR/dhcpd.leases, RUNDIR/dhcpd.pid,
.B DBDIR/dhcpd.leases~.
.SH SEE ALSO
dhclient(8), dhcrelay(8), dhcpd.conf(5), dhcpd.leases(5)
.SH AUTHOR
.B dhcpd(8)
was written by Ted Lemon <mellon@vix.com>
under a contract with Vixie Labs. Funding
for this project was provided by the Internet Software Corporation.
Information about the Internet Software Consortium can be found at
.B http://www.isc.org/isc.

267
dhcpd.c
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@ -1,267 +0,0 @@
/* dhcpd.c
DHCP Server Daemon. */
/*
* Copyright (c) 1995, 1996, 1997 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''.
*/
#ifndef lint
static char ocopyright[] =
"$Id: dhcpd.c,v 1.38 1997/02/22 08:49:44 mellon Exp $ Copyright 1995, 1996 The Internet Software Consortium.";
#endif
static char copyright[] =
"Copyright 1995, 1996 The Internet Software Consortium.";
static char arr [] = "All rights reserved.";
static char message [] = "Internet Software Consortium DHCPD $Name: $";
#include "dhcpd.h"
static void usage PROTO ((void));
TIME cur_time;
struct group root_group;
struct iaddr server_identifier;
int server_identifier_matched;
#ifdef USE_FALLBACK
struct interface_info fallback_interface;
#endif
u_int16_t local_port;
u_int16_t remote_port;
int log_priority;
#ifdef DEBUG
int log_perror = -1;
#else
int log_perror = 1;
#endif
char *path_dhcpd_conf = _PATH_DHCPD_CONF;
char *path_dhcpd_db = _PATH_DHCPD_DB;
char *path_dhcpd_pid = _PATH_DHCPD_PID;
int main (argc, argv, envp)
int argc;
char **argv, **envp;
{
int i, status;
struct servent *ent;
char *s;
#ifndef DEBUG
int pidfilewritten = 0;
int pid;
char pbuf [20];
int daemon = 1;
#endif
/* Initially, log errors to stderr as well as to syslogd. */
#ifdef SYSLOG_4_2
openlog ("dhcpd", LOG_NDELAY);
log_priority = DHCPD_LOG_FACILITY;
#else
openlog ("dhcpd", LOG_NDELAY, DHCPD_LOG_FACILITY);
#endif
#ifndef DEBUG
#ifndef SYSLOG_4_2
setlogmask (LOG_UPTO (LOG_INFO));
#endif
#endif
note (message);
note (copyright);
note (arr);
for (i = 1; i < argc; i++) {
if (!strcmp (argv [i], "-p")) {
if (++i == argc)
usage ();
for (s = argv [i]; *s; s++)
if (!isdigit (*s))
error ("%s: not a valid UDP port",
argv [i]);
status = atoi (argv [i]);
if (status < 1 || status > 65535)
error ("%s: not a valid UDP port",
argv [i]);
local_port = htons (status);
debug ("binding to user-specified port %d",
ntohs (local_port));
} else if (!strcmp (argv [i], "-f")) {
#ifndef DEBUG
daemon = 0;
#endif
} else if (!strcmp (argv [i], "-d")) {
#ifndef DEBUG
daemon = 0;
#endif
log_perror = -1;
} else if (!strcmp (argv [i], "-cf")) {
if (++i == argc)
usage ();
path_dhcpd_conf = argv [i];
} else if (!strcmp (argv [i], "-lf")) {
if (++i == argc)
usage ();
path_dhcpd_db = argv [i];
} else if (argv [i][0] == '-') {
usage ();
} else {
struct interface_info *tmp =
((struct interface_info *)
dmalloc (sizeof *tmp, "get_interface_list"));
if (!tmp)
error ("Insufficient memory to %s %s",
"record interface", argv [i]);
memset (tmp, 0, sizeof *tmp);
strcpy (tmp -> name, argv [i]);
tmp -> next = interfaces;
tmp -> flags = INTERFACE_REQUESTED;
interfaces = tmp;
}
}
#ifndef DEBUG
if (daemon) {
/* First part of becoming a daemon... */
if ((pid = fork ()) < 0)
error ("Can't fork daemon: %m");
else if (pid)
exit (0);
}
/* Read previous pid file. */
if ((i = open (path_dhcpd_pid, O_RDONLY)) >= 0) {
status = read (i, pbuf, (sizeof pbuf) - 1);
close (i);
pbuf [status] = 0;
pid = atoi (pbuf);
/* If the previous server process is not still running,
write a new pid file immediately. */
if (pid && kill (pid, 0) < 0) {
unlink (path_dhcpd_pid);
if ((i = open (path_dhcpd_pid,
O_WRONLY | O_CREAT, 0640)) >= 0) {
sprintf (pbuf, "%d\n", (int)getpid ());
write (i, pbuf, strlen (pbuf));
close (i);
pidfilewritten = 1;
}
}
}
#endif /* !DEBUG */
/* Default to the DHCP/BOOTP port. */
if (!local_port)
{
ent = getservbyname ("dhcp", "udp");
if (!ent)
local_port = htons (67);
else
local_port = ent -> s_port;
endservent ();
}
remote_port = htons (ntohs (local_port) + 1);
/* Get the current time... */
GET_TIME (&cur_time);
/* Read the dhcpd.conf file... */
if (!readconf ())
error ("Configuration file errors encountered -- exiting");
/* Start up the database... */
db_startup ();
/* Discover all the network interfaces and initialize them. */
discover_interfaces (1);
#ifndef DEBUG
/* If we were requested to log to stdout on the command line,
keep doing so; otherwise, stop. */
if (log_perror == -1)
log_perror = 1;
else
log_perror = 0;
if (daemon) {
/* Become session leader and get pid... */
close (0);
close (1);
close (2);
pid = setsid ();
}
/* If we didn't write the pid file earlier because we found a
process running the logged pid, but we made it to here,
meaning nothing is listening on the bootp port, then write
the pid file out - what's in it now is bogus anyway. */
if (!pidfilewritten) {
unlink (path_dhcpd_pid);
if ((i = open (path_dhcpd_pid,
O_WRONLY | O_CREAT, 0640)) >= 0) {
sprintf (pbuf, "%d\n", (int)getpid ());
write (i, pbuf, strlen (pbuf));
close (i);
pidfilewritten = 1;
}
}
#endif /* !DEBUG */
/* Receive packets and dispatch them... */
dispatch (1);
/* Not reached */
return 0;
}
/* Print usage message. */
static void usage ()
{
error ("Usage: dhcpd [-p <UDP port #>] [-d] [-f] [-cf config-file]%s",
"\n [-lf lease-file] [if0 [...ifN]]");
}
void cleanup ()
{
}

128
dhcpd.conf
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# dhcpd.conf
#
# Configuration file for ISC dhcpd
#
# Hosts with more than one interface MUST specify a ``server-identifier'',
# which should be the IP address of the server's primary network interface,
# or if there is no interface that can be described that way, at least an
# interface whose address isn't likely to change.
server-identifier toccata.fugue.com;
# option definitions common to all supported networks...
option domain-name "fugue.com";
option domain-name-servers toccata.fugue.com;
# Shared network declaration is used to group subnets which share the same
# physical network together. The name is specified so that the shared
# network can be referred to in log messages - it serves no other function.
shared-network FUGUE {
# option definitions common to this shared network.
option subnet-mask 255.255.255.224;
default-lease-time 600;
max-lease-time 7200;
# One of the two IP subnets that share this physical network
#
# Address ranges can be specified for each subnet attached to
# a shared network. Since these subnets share the same physical
# network, addresses are pooled together, and assignments are made
# without regard to the actual subnet. If the optional dynamic-bootp
# keyword is given in the address range declaration, then addresses
# in that range can be assigned either with the DHCP protocol or the
# BOOTP protocol; otherwise, only DHCP clients will have addresses
# allocated from the address range.
#
# Note that each IP subnet can have its own options specific to that subnet.
# options that aren't specified in the subnet are taken from the shared
# network (if any) and then from the global option list.
subnet 204.254.239.0 netmask 255.255.255.224 {
range 204.254.239.10 204.254.239.20;
option broadcast-address 204.254.239.31;
option routers prelude.fugue.com;
}
# The other subnet that shares this physical network
subnet 204.254.239.32 netmask 255.255.255.224 {
range dynamic-bootp 204.254.239.10 204.254.239.20;
option broadcast-address 204.254.239.31;
option routers snarg.fugue.com;
}
}
# IP subnets that are alone on their physical wire should be declared by
# themselves. ISC dhcpd may still refer to them as shared networks in
# log messages, but this is simply an artifact of the underlying data
# structures.
#
# Note that options can be specified in the subnet declaration which
# supersede the global options specified earlier.
subnet 192.5.5.0 netmask 255.255.255.224 {
range 192.5.5.26 192.5.5.30;
option name-servers bb.home.vix.com, gw.home.vix.com;
option domain-name "vix.com";
option routers 192.5.5.1;
option subnet-mask 255.255.255.224;
option broadcast-address 192.5.5.31;
default-lease-time 600;
max-lease-time 7200;
}
# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-specific information
# will still come from the host declaration.
host passacaglia {
hardware ethernet 0:0:c0:5d:bd:95;
filename "vmunix.passacaglia";
server-name "toccata.fugue.com";
}
# Fixed IP addresses can also be specified for hosts. These addresses
# should not also be listed as being available for dynamic assignment.
# Hosts for which fixed IP addresses have been specified can boot using
# BOOTP or DHCP. Hosts for which no fixed address is specified can only
# be booted with DHCP, unless there is an address range on the subnet
# to which a BOOTP client is connected which has the dynamic-bootp flag
# set.
host fantasia {
hardware ethernet 08:00:07:26:c0:a5;
fixed-address fantasia.fugue.com;
}
# If a DHCP or BOOTP client is mobile and might be connected to a variety
# of networks, more than one fixed address for that host can be specified.
# Hosts can have fixed addresses on some networks, but receive dynamically
# allocated address on other subnets; in order to support this, a host
# declaration for that client must be given which does not have a fixed
# address. If a client should get different parameters depending on
# what subnet it boots on, host declarations for each such network should
# be given. Finally, if a domain name is given for a host's fixed address
# and that domain name evaluates to more than one address, the address
# corresponding to the network to which the client is attached, if any,
# will be assigned.
host confusia {
hardware ethernet 02:03:04:05:06:07;
fixed-address confusia-1.fugue.com, confusia-2.fugue.com;
filename "vmunix.confusia";
server-name "toccata.fugue.com";
}
host confusia {
hardware ethernet 02:03:04:05:06:07;
fixed-address confusia-3.fugue.com;
filename "vmunix.confusia";
server-name "snarg.fugue.com";
}
host confusia {
hardware ethernet 02:03:04:05:06:07;
filename "vmunix.confusia";
server-name "bb.home.vix.com";
}

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dhcpd.conf.5
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