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delete dhclient(8). ipv4 dhcp leases have been acquired by the

Browse Source 
always-running-in-background dhcpleased(8) for a while, which is
activated per-interface with "ifconfig $if autoconf', or
"ifconfig $if inet autoconf", or with "inet autoconf" in /etc/hostname.$if
dhclient(8) has done execve(3) of ifconfig(8) to handle this for a while,
so everyone has moved to the dhcpleased(8) method
ok florian
This commit is contained in:
deraadt 2024-06-30 17:30:52 +00:00
parent 9518e4db3d
commit 0fbf39a0b5
25 changed files with 4 additions and 9455 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
distrib/sets/lists/base/mi
View File

@ -54,7 +54,6 @@
./etc/examples/acme-client.conf
./etc/examples/bgpd.conf
./etc/examples/chio.conf
./etc/examples/dhclient.conf
./etc/examples/dhcpd.conf
./etc/examples/doas.conf
./etc/examples/dvmrpd.conf
@ -349,7 +348,6 @@
./sbin/bioctl
./sbin/chown
./sbin/clri
./sbin/dhclient
./sbin/dhcp6leased
./sbin/dhcpleased
./sbin/disklabel

3
distrib/sets/lists/man/mi
View File

@ -2233,8 +2233,6 @@
./usr/share/man/man5/crontab.5
./usr/share/man/man5/cvs.5
./usr/share/man/man5/defaultdomain.5
./usr/share/man/man5/dhclient.conf.5
./usr/share/man/man5/dhclient.leases.5
./usr/share/man/man5/dhcp-options.5
./usr/share/man/man5/dhcp6leased.conf.5
./usr/share/man/man5/dhcpd.conf.5
@ -2436,7 +2434,6 @@
./usr/share/man/man8/cvsbug.8
./usr/share/man/man8/daily.8
./usr/share/man/man8/dev_mkdb.8
./usr/share/man/man8/dhclient.8
./usr/share/man/man8/dhcp6leasectl.8
./usr/share/man/man8/dhcp6leased.8
./usr/share/man/man8/dhcpd.8

4
etc/Makefile
View File

@ -1,4 +1,4 @@
# $OpenBSD: Makefile,v 1.489 2024/06/03 10:06:35 florian Exp $
# $OpenBSD: Makefile,v 1.490 2024/06/30 17:30:54 deraadt Exp $
.include <bsd.own.mk>
@ -45,7 +45,7 @@ MUTABLE=changelist daily etc.${MACHINE}/disktab \
pf.os protocols rc rc.conf rpc services shells syslog.conf weekly
# -rw-r--r--
EXAMPLES=acme-client.conf chio.conf dhclient.conf dhcpd.conf exports \
EXAMPLES=acme-client.conf chio.conf dhcpd.conf exports \
httpd.conf ifstated.conf inetd.conf man.conf mixerctl.conf \
mrouted.conf ntpd.conf printcap rad.conf rbootd.conf \
remote sensorsd.conf wsconsctl.conf

15
etc/examples/dhclient.conf
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@ -1,15 +0,0 @@
# $OpenBSD: dhclient.conf,v 1.2 2017/10/16 23:43:41 krw Exp $
#
# DHCP Client Configuration
#
# See dhclient.conf(5) for possible contents of this file.
#
# Example:
#
# send dhcp-lease-time 3600;
# send host-name "myhost";
# supersede host-name "myhost";
# supersede domain-name "my.domain";
# request subnet-mask, broadcast-address, time-offset, routers,
# domain-name, domain-name-servers, host-name, lpr-servers, ntp-servers;
# require subnet-mask, domain-name-servers, routers;

4
sbin/Makefile
View File

@ -1,6 +1,6 @@
# $OpenBSD: Makefile,v 1.111 2024/06/03 10:05:18 florian Exp $
# $OpenBSD: Makefile,v 1.112 2024/06/30 17:30:54 deraadt Exp $
SUBDIR= atactl badsect bioctl clri dhclient dhcp6leased dhcpleased \
SUBDIR= atactl badsect bioctl clri dhcp6leased dhcpleased \
disklabel dmesg dump dumpfs fdisk fsck fsck_ext2fs fsck_ffs \
fsck_msdos fsdb fsirand growfs ifconfig iked init ipsecctl \
isakmpd kbd ldattach mknod mount \

50
sbin/dhclient/Makefile
View File

@ -1,50 +0,0 @@
# $OpenBSD: Makefile,v 1.20 2017/07/08 20:38:31 krw Exp $
#
# Copyright (c) 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.
#
.include <bsd.own.mk>
SRCS= dhclient.c clparse.c dispatch.c bpf.c options.c \
conflex.c log.c packet.c \
parse.c privsep.c kroute.c
PROG= dhclient
LDADD+= -lutil
DPADD+= ${LIBUTIL}
MAN= dhclient.8 dhclient.conf.5 dhclient.leases.5
CFLAGS+=-Wall
CFLAGS+=-Wstrict-prototypes -Wmissing-prototypes
CFLAGS+=-Wmissing-declarations
CFLAGS+=-Wshadow -Wpointer-arith -Wcast-qual
CFLAGS+=-Wsign-compare
.include <bsd.prog.mk>

401
sbin/dhclient/bpf.c
View File

@ -1,401 +0,0 @@
/* $OpenBSD: bpf.c,v 1.75 2019/03/18 00:00:59 dlg Exp $ */
/* BPF socket interface code, originally contributed by Archie Cobbs. */
/*
* Copyright (c) 1995, 1996, 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''.
*/
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <net/bpf.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/if_ether.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dhcp.h"
#include "dhcpd.h"
#include "log.h"
int
get_bpf_sock(char *name)
{
struct ifreq ifr;
int sock;
if ((sock = open("/dev/bpf", O_RDWR | O_CLOEXEC)) == -1)
fatal("open(/dev/bpf)");
/* Set the BPF device to point at this interface. */
strlcpy(ifr.ifr_name, name, IFNAMSIZ);
if (ioctl(sock, BIOCSETIF, &ifr) == -1)
fatal("BIOCSETIF");
return sock;
}
int
get_udp_sock(int rdomain)
{
int sock, on = 1;
/*
* Use raw socket for unicast send.
*/
if ((sock = socket(AF_INET, SOCK_RAW, IPPROTO_UDP)) == -1)
fatal("socket(AF_INET, SOCK_RAW)");
if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, &on,
sizeof(on)) == -1)
fatal("setsockopt(IP_HDRINCL)");
if (setsockopt(sock, IPPROTO_IP, SO_RTABLE, &rdomain,
sizeof(rdomain)) == -1)
fatal("setsockopt(SO_RTABLE)");
return sock;
}
/*
* Packet filter program.
*
* N.B.: Changes to the filter program may require changes to the
* constant offsets used in if_register_receive to patch the BPF program!
*/
struct bpf_insn dhcp_bpf_filter[] = {
/* Make sure this is an IP packet. */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 12),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 8),
/* Make sure it's a UDP packet. */
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, 23),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 6),
/* Make sure this isn't a fragment. */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 20),
BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 4, 0),
/* Get the IP header length. */
BPF_STMT(BPF_LDX + BPF_B + BPF_MSH, 14),
/* Make sure it's to the right port. */
BPF_STMT(BPF_LD + BPF_H + BPF_IND, 16),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 67, 0, 1), /* patch */
/* If we passed all the tests, ask for the whole packet. */
BPF_STMT(BPF_RET+BPF_K, (unsigned int)-1),
/* Otherwise, drop it. */
BPF_STMT(BPF_RET+BPF_K, 0),
};
int dhcp_bpf_filter_len = sizeof(dhcp_bpf_filter) / sizeof(struct bpf_insn);
/*
* Packet write filter program:
* 'ip and udp and src port bootps and dst port (bootps or bootpc)'
*/
struct bpf_insn dhcp_bpf_wfilter[] = {
BPF_STMT(BPF_LD + BPF_B + BPF_IND, 14),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (IPVERSION << 4) + 5, 0, 12),
/* Make sure this is an IP packet. */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 12),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 10),
/* Make sure it's a UDP packet. */
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, 23),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 8),
/* Make sure this isn't a fragment. */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 20),
BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 6, 0), /* patched */
/* Get the IP header length. */
BPF_STMT(BPF_LDX + BPF_B + BPF_MSH, 14),
/* Make sure it's from the right port. */
BPF_STMT(BPF_LD + BPF_H + BPF_IND, 14),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 68, 0, 3),
/* Make sure it is to the right ports. */
BPF_STMT(BPF_LD + BPF_H + BPF_IND, 16),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 67, 0, 1),
/* If we passed all the tests, ask for the whole packet. */
BPF_STMT(BPF_RET+BPF_K, (unsigned int)-1),
/* Otherwise, drop it. */
BPF_STMT(BPF_RET+BPF_K, 0),
};
int dhcp_bpf_wfilter_len = sizeof(dhcp_bpf_wfilter) / sizeof(struct bpf_insn);
int
configure_bpf_sock(int bpffd)
{
struct bpf_version v;
struct bpf_program p;
int flag = 1, sz;
int fildrop = BPF_FILDROP_CAPTURE;
/* Make sure the BPF version is in range. */
if (ioctl(bpffd, BIOCVERSION, &v) == -1)
fatal("BIOCVERSION");
if (v.bv_major != BPF_MAJOR_VERSION ||
v.bv_minor < BPF_MINOR_VERSION)
fatalx("kernel BPF version out of range - recompile "
"dhclient");
/*
* Set immediate mode so that reads return as soon as a packet
* comes in, rather than waiting for the input buffer to fill
* with packets.
*/
if (ioctl(bpffd, BIOCIMMEDIATE, &flag) == -1)
fatal("BIOCIMMEDIATE");
if (ioctl(bpffd, BIOCSFILDROP, &fildrop) == -1)
fatal("BIOCSFILDROP");
/* Get the required BPF buffer length from the kernel. */
if (ioctl(bpffd, BIOCGBLEN, &sz) == -1)
fatal("BIOCGBLEN");
/* Set up the bpf filter program structure. */
p.bf_len = dhcp_bpf_filter_len;
p.bf_insns = dhcp_bpf_filter;
/* Patch the server port into the BPF program.
*
* N.B.: changes to filter program may require changes to the
* insn number(s) used below!
*/
dhcp_bpf_filter[8].k = LOCAL_PORT;
if (ioctl(bpffd, BIOCSETF, &p) == -1)
fatal("BIOCSETF");
/* Set up the bpf write filter program structure. */
p.bf_len = dhcp_bpf_wfilter_len;
p.bf_insns = dhcp_bpf_wfilter;
if (dhcp_bpf_wfilter[7].k == 0x1fff)
dhcp_bpf_wfilter[7].k = htons(IP_MF|IP_OFFMASK);
if (ioctl(bpffd, BIOCSETWF, &p) == -1)
fatal("BIOCSETWF");
if (ioctl(bpffd, BIOCLOCK, NULL) == -1)
fatal("BIOCLOCK");
return sz;
}
ssize_t
send_packet(struct interface_info *ifi, struct in_addr from, struct in_addr to,
const char *desc)
{
struct iovec iov[4];
struct sockaddr_in dest;
struct ether_header eh;
struct ip ip;
struct udphdr udp;
struct msghdr msg;
struct dhcp_packet *packet = &ifi->sent_packet;
ssize_t result, total;
unsigned int iovcnt = 0, i;
int len = ifi->sent_packet_length;
memset(&dest, 0, sizeof(dest));
dest.sin_family = AF_INET;
dest.sin_port = htons(REMOTE_PORT);
dest.sin_addr.s_addr = to.s_addr;
if (to.s_addr == INADDR_BROADCAST) {
assemble_eh_header(ifi->hw_address, &eh);
iov[0].iov_base = &eh;
iov[0].iov_len = sizeof(eh);
iovcnt++;
}
ip.ip_v = 4;
ip.ip_hl = 5;
ip.ip_tos = IPTOS_LOWDELAY;
ip.ip_len = htons(sizeof(ip) + sizeof(udp) + len);
ip.ip_id = 0;
ip.ip_off = 0;
ip.ip_ttl = 128;
ip.ip_p = IPPROTO_UDP;
ip.ip_sum = 0;
ip.ip_src.s_addr = from.s_addr;
ip.ip_dst.s_addr = to.s_addr;
ip.ip_sum = wrapsum(checksum((unsigned char *)&ip, sizeof(ip), 0));
iov[iovcnt].iov_base = &ip;
iov[iovcnt].iov_len = sizeof(ip);
iovcnt++;
udp.uh_sport = htons(LOCAL_PORT);
udp.uh_dport = htons(REMOTE_PORT);
udp.uh_ulen = htons(sizeof(udp) + len);
udp.uh_sum = 0;
udp.uh_sum = wrapsum(checksum((unsigned char *)&udp, sizeof(udp),
checksum((unsigned char *)packet, len,
checksum((unsigned char *)&ip.ip_src,
2 * sizeof(ip.ip_src),
IPPROTO_UDP + (uint32_t)ntohs(udp.uh_ulen)))));
iov[iovcnt].iov_base = &udp;
iov[iovcnt].iov_len = sizeof(udp);
iovcnt++;
iov[iovcnt].iov_base = packet;
iov[iovcnt].iov_len = len;
iovcnt++;
total = 0;
for (i = 0; i < iovcnt; i++)
total += iov[i].iov_len;
if (to.s_addr == INADDR_BROADCAST) {
result = writev(ifi->bpffd, iov, iovcnt);
if (result == -1)
log_warn("%s: writev(%s)", log_procname, desc);
else if (result < total) {
log_warnx("%s, writev(%s): %zd of %zd bytes",
log_procname, desc, result, total);
result = -1;
}
} else {
memset(&msg, 0, sizeof(msg));
msg.msg_name = (struct sockaddr *)&dest;
msg.msg_namelen = sizeof(dest);
msg.msg_iov = iov;
msg.msg_iovlen = iovcnt;
result = sendmsg(ifi->udpfd, &msg, 0);
if (result == -1)
log_warn("%s: sendmsg(%s)", log_procname, desc);
else if (result < total) {
result = -1;
log_warnx("%s, sendmsg(%s): %zd of %zd bytes",
log_procname, desc, result, total);
}
}
return result;
}
/*
* Extract a DHCP packet from a bpf capture buffer.
*
* Each captured packet is
*
* <BPF header>
* <padding to BPF_WORDALIGN>
* <captured DHCP packet>
* <padding to BPF_WORDALIGN>
*
* Return the number of bytes processed or 0 if there is
* no valid DHCP packet in the buffer.
*/
ssize_t
receive_packet(unsigned char *buf, unsigned char *lim,
struct sockaddr_in *from, struct ether_addr *hfrom,
struct dhcp_packet *packet)
{
struct bpf_hdr bh;
struct ether_header eh;
unsigned char *pktlim, *data, *next;
size_t datalen;
int len;
for (next = buf; next < lim; next = pktlim) {
/* No bpf header means no more packets. */
if (lim < next + sizeof(bh))
return 0;
memcpy(&bh, next, sizeof(bh));
pktlim = next + BPF_WORDALIGN(bh.bh_hdrlen + bh.bh_caplen);
/* Truncated bpf packet means no more packets. */
if (lim < next + bh.bh_hdrlen + bh.bh_caplen)
return 0;
/* Drop incompletely captured DHCP packets. */
if (bh.bh_caplen != bh.bh_datalen)
continue;
/*
* Drop packets with invalid ethernet/ip/udp headers.
*/
if (pktlim < next + bh.bh_hdrlen + sizeof(eh))
continue;
memcpy(&eh, next + bh.bh_hdrlen, sizeof(eh));
memcpy(hfrom->ether_addr_octet, eh.ether_shost, ETHER_ADDR_LEN);
len = decode_udp_ip_header(next + bh.bh_hdrlen + sizeof(eh),
bh.bh_caplen - sizeof(eh), from);
if (len < 0)
continue;
/* Drop packets larger than sizeof(struct dhcp_packet). */
datalen = bh.bh_caplen - (sizeof(eh) + len);
if (datalen > sizeof(*packet))
continue;
/* Extract the DHCP packet for further processing. */
data = next + bh.bh_hdrlen + sizeof(eh) + len;
memset(packet, DHO_END, sizeof(*packet));
memcpy(packet, data, datalen);
return (pktlim - buf);
}
return 0;
}

1029
sbin/dhclient/clparse.c
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File diff suppressed because it is too large Load Diff

406
sbin/dhclient/conflex.c
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@ -1,406 +0,0 @@
/* $OpenBSD: conflex.c,v 1.50 2019/01/26 23:26:20 krw Exp $ */
/* Lexical scanner for dhclient 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''.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <ctype.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dhcp.h"
#include "dhcpd.h"
#include "dhctoken.h"
#include "log.h"
int lexline;
int lexchar;
char *token_line;
char *tlname;
static char line1[81];
static char line2[81];
static char *prev_line;
static char *cur_line;
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];
static void eol(void);
static void skip_to_eol(FILE *);
static int get_char(FILE *);
static int get_token(FILE *);
static int read_string(FILE *);
static int read_num_or_name(int, FILE *);
static int intern(char *, int);
void
new_parse(char *name)
{
/*
* Initialize all parsing state, as we are starting to parse a
* new file, 'name'.
*/
memset(line1, 0, sizeof(line1));
memset(line2, 0, sizeof(line2));
memset(tokbuf, 0, sizeof(tokbuf));
lpos = line = 1;
tlpos = tline = token = ugflag = 0;
tval = NULL;
lexline = lexchar = 0;
cur_line = line1;
prev_line = line2;
token_line = cur_line;
tlname = name;
}
/*
* eol() increments the lexical line.
*
* It is split from get_char() because read_num_or_name() does *not*
* want the lexical line incremented when a '\n' ends the token assembly.
* Instead, it ungetc()'s the '\n' for the next token parse to deal with.
* Incrementing the lexical line in that case causes parse_warn() to
* generate messages that display a blank line instead of the offending
* token in context.
*
* Invoccations of get_char() wanting to increment the lexical line on '\n'
* must call eol().
*/
static void
eol(void)
{
if (cur_line == line1) {
cur_line = line2;
prev_line = line1;
} else {
cur_line = line1;
prev_line = line2;
}
line++;
lpos = 1;
cur_line[0] = 0;
}
static int
get_char(FILE *cfile)
{
int c;
c = getc(cfile);
if (ugflag == 0) {
if (c != EOF && c != '\n') {
if ((unsigned int)lpos < sizeof(line1)) {
cur_line[lpos - 1] = c;
cur_line[lpos] = 0;
}
lpos++;
}
} else
ugflag = 0;
return c;
}
static int
get_token(FILE *cfile)
{
static char tb[2];
int c, ttok;
int l, p, u;
u = ugflag;
for (;;) {
l = line;
p = lpos - u;
u = 0;
c = get_char(cfile);
if (isascii(c) != 0 && isspace(c) != 0) {
if (c == '\n')
eol();
continue;
}
if (c == '#') {
skip_to_eol(cfile);
continue;
}
lexline = l;
lexchar = p;
if (c == '"') {
ttok = read_string(cfile);
break;
} else if (c == '-' || (isascii(c) != 0 && isalnum(c) != 0)) {
ttok = read_num_or_name(c, cfile);
break;
} else {
tb[0] = c;
tb[1] = 0;
tval = tb;
ttok = c;
break;
}
}
return ttok;
}
int
next_token(char **rval, FILE *cfile)
{
int rv;
if (token != 0) {
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 != 0)
*rval = tval;
return rv;
}
int
peek_token(char **rval, FILE *cfile)
{
int x;
if (token == 0) {
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 != 0)
*rval = tval;
return token;
}
static void
skip_to_eol(FILE *cfile)
{
int c;
for (;;) {
c = get_char(cfile);
if (c == EOF)
return;
if (c == '\n') {
eol();
return;
}
}
}
static int
read_string(FILE *cfile)
{
int i, c, bs;
/*
* Read in characters until an un-escaped '"' is encountered.
*/
bs = i = 0;
while ((c = get_char(cfile)) != EOF) {
if (c == '"' && bs == 0)
break;
if (c == '\n')
eol();
tokbuf[i++] = c;
if (bs != 0)
bs = 0;
else if (c == '\\')
bs = 1;
if (i == sizeof(tokbuf) - 1)
break;
}
if (bs == 1)
i--;
if (c == EOF)
parse_warn("eof in string constant");
else if (c != '"')
parse_warn("string constant too long");
tokbuf[i] = '\0';
tval = tokbuf;
return TOK_STRING;
}
static int
read_num_or_name(int c, FILE *cfile)
{
unsigned int i, xdigits;
int rv;
xdigits = (isxdigit(c) != 0) ? 1 : 0;
tokbuf[0] = c;
for (i = 1; i < sizeof(tokbuf); i++) {
c = get_char(cfile);
if (isascii(c) == 0 || (c != '-' && c != '_' &&
isalnum(c) == 0)) {
/* N.B.: Do not call eol()! '\n' is put back. */
ungetc(c, cfile);
ugflag = 1;
break;
}
if (isxdigit(c) != 0)
xdigits++;
tokbuf[i] = c;
}
if (i == sizeof(tokbuf)) {
parse_warn("token larger than internal buffer");
i--;
c = tokbuf[i];
if (isxdigit(c) != 0)
xdigits--;
}
tokbuf[i] = 0;
tval = tokbuf;
c = (unsigned int)tokbuf[0];
if (c == '-')
rv = TOK_NUMBER;
else
rv = intern(tval, TOK_NUMBER_OR_NAME);
if (rv == TOK_NUMBER_OR_NAME && xdigits != i)
rv = TOK_NAME;
return rv;
}
static const struct keywords {
const char *k_name;
int k_val;
} keywords[] = {
{ "append", TOK_APPEND },
{ "backoff-cutoff", TOK_BACKOFF_CUTOFF },
{ "bootp", TOK_BOOTP },
{ "default", TOK_DEFAULT },
{ "epoch", TOK_EPOCH },
{ "expire", TOK_EXPIRE },
{ "filename", TOK_FILENAME },
{ "fixed-address", TOK_FIXED_ADDR },
{ "ignore", TOK_IGNORE },
{ "initial-interval", TOK_INITIAL_INTERVAL },
{ "interface", TOK_INTERFACE },
{ "lease", TOK_LEASE },
{ "link-timeout", TOK_LINK_TIMEOUT },
{ "next-server", TOK_NEXT_SERVER },
{ "option", TOK_OPTION },
{ "prepend", TOK_PREPEND },
{ "rebind", TOK_REBIND },
{ "reboot", TOK_REBOOT },
{ "reject", TOK_REJECT },
{ "renew", TOK_RENEW },
{ "request", TOK_REQUEST },
{ "require", TOK_REQUIRE },
{ "retry", TOK_RETRY },
{ "select-timeout", TOK_SELECT_TIMEOUT },
{ "send", TOK_SEND },
{ "server-name", TOK_SERVER_NAME },
{ "ssid", TOK_SSID },
{ "supersede", TOK_SUPERSEDE },
{ "timeout", TOK_TIMEOUT },
{ "uselease", TOK_USELEASE }
};
int kw_cmp(const void *k, const void *e);
int
kw_cmp(const void *k, const void *e)
{
return strcasecmp(k, ((const struct keywords *)e)->k_name);
}
static int
intern(char *atom, int dfv)
{
const struct keywords *p;
p = bsearch(atom, keywords, sizeof(keywords)/sizeof(keywords[0]),
sizeof(keywords[0]), kw_cmp);
if (p != NULL)
return p->k_val;
return dfv;
}

292
sbin/dhclient/dhclient.8
View File

@ -1,292 +0,0 @@
.\" $OpenBSD: dhclient.8,v 1.50 2022/05/16 17:15:16 abieber Exp $
.\"
.\" Copyright (c) 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.isc.org/isc''. To learn more about Vixie
.\" Enterprises, see ``http://www.vix.com''.
.Dd $Mdocdate: May 16 2022 $
.Dt DHCLIENT 8
.Os
.Sh NAME
.Nm dhclient
.Nd Dynamic Host Configuration Protocol (DHCP) client
.Sh SYNOPSIS
.Nm
.Op Fl dnrv
.Op Fl c Ar file
.Op Fl i Ar options
.Ar interface
.Sh DESCRIPTION
.Nm
uses the Dynamic Host Configuration Protocol (DHCP), or its
predecessor BOOTP, to configure a network interface.
Information typically provided via DHCP includes
IPv4 address and subnet mask, default route,
and domain name server.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl c Ar file
Specify an alternate location to
.Pa /etc/dhclient.conf
for the configuration file.
If
.Ar file
is the empty string then no configuration file is read.
.It Fl d
Do not daemonize.
If this option is specified,
.Nm
will run in the foreground and log to
.Em stderr .
.It Fl i Ar options
.Nm
will ignore values provided by leases for the options specified.
This list will supplement ignore statements in
.Xr dhclient.conf 5 .
.Ar options
must be a comma separated list of valid option names.
.It Fl n
Configtest mode.
Only check the configuration file for validity.
.It Fl r
Release the current lease back to the server it came from.
.Nm
exits after removing the active lease from
.Pa /var/db/dhclient.leases . Ns Aq Ar IFNAME ,
deleting the address the lease caused to be added to the interface,
and sending a DHCPRELEASE packet to the server that supplied the lease.
.Pp
If there is no
.Nm
controlling the specified interface, or
.Nm
has no active lease configured, no action is performed.
.It Fl v
Causes
.Nm
to show more information about interactions with the DHCP server and what
network configuration changes are attempted after accepting a lease.
.Fl v
is implied if either
.Fl d
or
.Fl n
is present.
.El
.Pp
The DHCP protocol allows a host to contact a central server which
maintains a list of IP addresses which may be assigned on one or more
subnets.
A DHCP client may request an address from this pool, and
then use it on a temporary basis for communication on the network.
The DHCP protocol also provides a mechanism whereby a client can learn
important details about the network to which it is attached, such as
the location of a default router, the location of a name server, and
so on.
.Pp
On startup,
.Nm
reads
.Pa /etc/dhclient.conf
for configuration instructions.
It then attempts to configure the network interface
.Ar interface
with DHCP.
The special value
.Dq egress
may be used instead of a network interface name.
In this case
.Nm
will look for the network interface currently in the interface group
.Dq egress
and configure it with DHCP.
If there is more than one network interface in the egress group,
.Nm
will exit with an error.
.Pp
When configuring the interface,
.Nm
attempts to remove any existing addresses, gateway routes that use
the interface, and non-permanent
.Xr arp 8
entries.
.Nm
automatically exits whenever a new
.Nm
is run on the same interface.
.Pp
Once the interface is configured,
.Nm
constructs a
.Xr resolv.conf 5
file.
It does this only if any of the options
.Cm domain-name ,
.Cm domain-name-servers ,
or
.Cm domain-search
are present
(note that these options may be offered by the DHCP server but suppressed by
.Xr dhclient.conf 5 ) .
If a resolv.conf is constructed,
.Nm
appends any contents of the
.Pa /etc/resolv.conf.tail
file, which are read once at start up.
The constructed resolv.conf is copied into
.Pa /etc/resolv.conf
whenever the default route goes out the interface
.Nm
is running on.
.Nm
monitors the system for changes to the default route and re-checks
whether it should write its resolv.conf when possible changes are
detected.
.Pp
In order to keep track of leases across system reboots and server
restarts,
.Nm
keeps a list of leases it has been assigned in the
.Pa /var/db/dhclient.leases . Ns Aq Ar IFNAME
file.
.Ar IFNAME
represents the network interface of the DHCP client
.Pq e.g. em0 ,
one for each interface.
On startup, after reading the
.Xr dhclient.conf 5
file,
.Nm
reads the leases file to refresh its memory about what leases it has been
assigned.
.Pp
Old leases are kept around in case the DHCP server is unavailable when
.Nm
is first invoked (generally during the initial system boot
process).
In that event, old leases from the
.Pa dhclient.leases . Ns Aq Ar IFNAME
file which have not yet expired are tested, and if they are determined to
be valid, they are used until either they expire or the DHCP server
becomes available.
.Pp
A mobile host which may sometimes need to access a network on which no
DHCP server exists may be preloaded with a lease for a fixed
address on that network.
When all attempts to contact a DHCP server have failed,
.Nm
will try to validate the static lease, and if it
succeeds, it will use that lease until it is restarted.
.Pp
A mobile host may also travel to some networks on which DHCP is not
available but BOOTP is.
In that case, it may be advantageous to
arrange with the network administrator for an entry on the BOOTP
database, so that the host can boot quickly on that network rather
than cycling through the list of old leases.
.Sh FILES
.Bl -tag -width "/var/db/dhclient.leases.<IFNAME>XXX" -compact
.It Pa /etc/dhclient.conf
DHCP client configuration file
.It Pa /etc/hostname.XXX
interface-specific configuration files
.It Pa /var/db/dhclient.leases . Ns Aq Ar IFNAME
database of acquired leases
.El
.Sh SEE ALSO
.Xr dhclient.conf 5 ,
.Xr dhclient.leases 5 ,
.Xr hostname.if 5 ,
.Xr dhcpd 8 ,
.Xr dhcrelay 8 ,
.Xr ifconfig 8
.Sh STANDARDS
.Rs
.%A R. Droms
.%D October 1993
.%R RFC 1534
.%T Interoperation Between DHCP and BOOTP
.Re
.Pp
.Rs
.%A R. Droms
.%D March 1997
.%R RFC 2131
.%T Dynamic Host Configuration Protocol
.Re
.Pp
.Rs
.%A S. Alexander
.%A R. Droms
.%D March 1997
.%R RFC 2132
.%T DHCP Options and BOOTP Vendor Extensions
.Re
.Pp
.Rs
.%A T. Lemon
.%A S. Cheshire
.%D November 2002
.%R RFC 3396
.%T Encoding Long Options in the Dynamic Host Configuration Protocol (DHCPv4)
.Re
.Pp
.Rs
.%A T. Lemon
.%A S. Cheshire
.%A B. Volz
.%D December 2002
.%R RFC 3442
.%T The Classless Static Route Option for Dynamic Host Configuration Protocol (DHCP) version 4
.Re
.Pp
.Rs
.%A N. Swamy
.%A G. Halwasia
.%A P. Jhingram
.%D January 2013
.%R RFC 6842
.%T Client Identifier Option in DHCP Server Replies
.Re
.Sh AUTHORS
.An -nosplit
.Nm
was written by
.An Ted Lemon Aq Mt mellon@fugue.com
and
.An Elliot Poger Aq Mt elliot@poger.com .
.Pp
The current implementation was reworked by
.An Henning Brauer Aq Mt henning@openbsd.org .

2927
sbin/dhclient/dhclient.c
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File diff suppressed because it is too large Load Diff

301
sbin/dhclient/dhclient.conf.5
View File

@ -1,301 +0,0 @@
.\" $OpenBSD: dhclient.conf.5,v 1.52 2022/03/31 17:27:19 naddy Exp $
.\"
.\" Copyright (c) 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.isc.org/isc''. To learn more about Vixie
.\" Enterprises, see ``http://www.vix.com''.
.\"
.Dd $Mdocdate: March 31 2022 $
.Dt DHCLIENT.CONF 5
.Os
.Sh NAME
.Nm dhclient.conf
.Nd DHCP client configuration file
.Sh DESCRIPTION
.Nm
is the configuration file for
.Xr dhclient 8 .
It is a free-form ASCII text file made up of declarations, extra
tabs and newlines for formatting purposes and comments.
Keywords in the file are case-insensitive.
Comments begin with the
.Sq #
character and extend to the end of the current line.
.Sh PROTOCOL TIMING DECLARATIONS
.Bl -tag -width Ds
.It Ic backoff-cutoff Ar seconds ;
Sets the maximum number of seconds to
wait before retransmitting a packet.
The default is 10 seconds.
.It Ic initial-interval Ar seconds ;
Sets the number of seconds between the first packet transmission
and the first retransmission of the packet.
The default is 1 second.
.It Ic link-timeout Ar seconds ;
Sets the number of seconds
to wait for a lease before going into the background as a daemon.
The default is 10 seconds.
.It Ic reboot Ar seconds ;
Sets the number of seconds to wait
before giving up on reacquiring the previous lease, and how long
to attempt unicast renewal requests before falling back to broadcast
renewal requests.
The default is 1 second.
.It Ic retry Ar seconds ;
Sets the number of seconds to wait before starting a new attempt to
obtain a lease.
The default is 1 second.
.It Ic select-timeout Ar seconds ;
Sets the number of seconds to wait for additional leases after the
first lease arrives.
After
.Ic select-timeout
seconds the best lease received will be selected.
The default is 0 seconds, i.e. immediately use
the first acceptable lease received.
.It Ic timeout Ar seconds ;
Sets the number of seconds to wait for a lease.
If no lease is received, the first valid lease in
.Xr dhclient.leases 5
will be used.
The default is 30 seconds.
.El
.Sh DHCP OPTION DECLARATIONS
.Bl -tag -width Ds
.It Ic append Ar option option-value ;
Append
.Ar option-value
to the value of
.Ar option
in the lease.
Each
.Ic append
for
.Ar option
overrides any previous
.Ic append ,
.Ic default ,
.Ic ignore ,
.Ic prepend
or
.Ic supersede
for
.Ar option .
.Pp
If the option's data cannot be appended to, i.e. it has a fixed size,
then
.Ic append
will be treated as
.Ic default .
.It Ic default Ar option option-value ;
If no value for
.Ar option
is present in the lease, use
.Ar option-value .
Each
.Ic default
for
.Ar option
overrides any previous
.Ic append ,
.Ic default ,
.Ic ignore ,
.Ic prepend
or
.Ic supersede
for
.Ar option .
.It Ic ignore Op Ar option , ... ;
Discard values provided for the listed options.
.Ic ignore
statements are cumulative, except that an empty
list will remove all previously specified options.
Each
.Ic ignore
for
.Ar option
overrides any previous
.Ic append ,
.Ic default ,
.Ic prepend
or
.Ic supersede
for
.Ar option .
.It Ic prepend Ar option option-value ;
Prepend
.Ar option-value
to the value of
.Ar option
in the lease.
Each
.Ic prepend
for
.Ar option
overrides any previous
.Ic append ,
.Ic default ,
.Ic ignore ,
.Ic prepend
or
.Ic supersede
for
.Ar option .
.Pp
If the option's data cannot be prepended to, i.e. it has a fixed size,
then
.Ic prepend
will be treated as
.Ic supersede .
.It Ic request Op Ar option , ... ;
Ask that any lease contain values
for the listed options.
.Ic request
statements are cumulative, except that an empty
list will remove all previously specified options.
The default is to request the options
bootfile-name,
broadcast-address,
classless-static-routes,
host-name,
domain-name,
domain-name-servers,
domain-search,
routers,
subnet-mask,
tftp-server-name
and
time-offset.
.It Ic require Op Ar option , ... ;
Discard leases that do not contain the listed options.
.Ic require
statements are cumulative, except that an empty
list will remove all previously specified options.
The default is to require the option subnet-mask.
.It Ic send Ar option option-value ;
Include
.Ar option-value
in requests for a lease.
To include multiple options in requests,
.Ic send
can be used multiple times.
.It Ic supersede Ar option option-value ;
Use
.Ar option-value
for the given
.Ar option
regardless of the value in the lease.
Each
.Ic supersede
for
.Ar option
overrides any previous
.Ic append ,
.Ic default ,
.Ic ignore ,
.Ic prepend
or
.Ic supersede
for
.Ar option .
.It Ic uselease Op Ar option , ... ;
Use the unmodified values provided in the lease for
any specified
.Ar option .
.Ic uselease
statements are cumulative.
If no
.Ar option
is specified, all lease option values will be used unmodified.
.Ic uselease
for
.Ar option
overrides any previous
.Ic append ,
.Ic default ,
.Ic ignore ,
.Ic prepend
or
.Ic supersede
for
.Ar option .
.El
.Sh OTHER DECLARATIONS
.Bl -tag -width Ds
.It Ic filename Ar path ;
Use
.Ar path
instead of the
.Ic file
field of the DHCP offer when binding a lease.
.It Ic fixed-address Ar ip-address ;
Use
.Ar ip-address
instead of the
.Ic yiaddr
field of the DHCP offer when binding a lease.
.It Ic interface Qo Ar name Qc No { Ar declaration ; ... ; No }
Apply any
.Ar declaration
only to the named interface.
.It Ic reject Ar ip-address ;
Discard leases from the specified address.
If more than one
.Ic reject
is present, all leases from any of the
addresses will be discarded.
.It Ic next-server Ar ip-address ;
Use
.Ar ip-address
instead of the
.Ic siaddr
field of the DHCP offer when binding a lease.
.It Ic server-name Ar host ;
Use
.Ar host
instead of the
.Ic sname
field of the DHCP offer when binding a lease.
.El
.Sh FILES
.Bl -tag -width /etc/examples/dhclient.conf -compact
.It Pa /etc/dhclient.conf
.It Pa /etc/examples/dhclient.conf
.El
.Sh SEE ALSO
.Xr dhclient.leases 5 ,
.Xr dhcp-options 5 ,
.Xr dhcpd.conf 5 ,
.Xr dhclient 8 ,
.Xr dhcpd 8

170
sbin/dhclient/dhclient.leases.5
View File

@ -1,170 +0,0 @@
.\" $OpenBSD: dhclient.leases.5,v 1.14 2017/12/18 14:17:58 krw Exp $
.\"
.\" Copyright (c) 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.isc.org/isc''. To learn more about Vixie
.\" Enterprises, see ``http://www.vix.com''.
.\"
.Dd $Mdocdate: December 18 2017 $
.Dt DHCLIENT.LEASES 5
.Os
.Sh NAME
.Nm dhclient.leases
.Nd DHCP client lease database
.Sh DESCRIPTION
.Xr dhclient 8
keeps a persistent database of leases that it has acquired that are still
valid.
The database is a free-form ASCII file containing one valid declaration
per lease.
The file is written as a log, so the last declaration is the most recent
lease obtained.
.Pp
The lease file is named
.Pa /var/db/dhclient.leases . Ns Aq Ar IFNAME ,
where
.Qq IFNAME
represents the network interface
.Xr dhclient 8
acquired the lease on.
For example, if
.Xr dhclient 8
is configured for the em0 network device,
the lease file will be named
.Pa /var/db/dhclient.leases.em0 ,
.Pp
A lease statement has the format
.Pp
.D1 Ic lease No { Ar lease-declaration ; ... ; No }
.Pp
Where
.Ar lease\-declaration
is one of:
.Pp
.Bl -tag -width Ds -compact
.It Ic bootp
The lease was acquired using the
BOOTP protocol rather than the DHCP protocol.
.Pp
.It Ic epoch
The
.Xr time 3
when the lease was obtained.
This value is used to convert the values of the DHCP options
.Ic dhcp-lease-time ,
.Ic dhcp-renewal-time ,
and
.Ic dhcp-rebinding-time
to times.
A value of 0 will cause
.Ic epoch
to be set to the current time when
.Nm
is processed.
.Pp
.It Ic expire Ar date
.It Ic rebind Ar date
.It Ic renew Ar date
.Ic expire
is when
.Xr dhclient 8
will no longer use the lease to configure the interface.
.Ic rebind
is when
.Xr dhclient 8
will begin trying to renew the lease with broadcasts to any server.
.Ic renew
is when
.Xr dhclient 8
will begin trying to renew the lease with unicasts to the originating server.
.Pp
Dates are specified in accordance with the
.Xr strptime 3
format:
.Pp
.D1 %w %Y/%m/%d \&%T UTC
.Pp
For example:
.Pp
.Dl renew 1 2017/10/16 14:03:49 UTC
.Pp
.Ic expire ,
.Ic rebind ,
.Ic renew
are just comments that are ignored when processing
.Nm .
The values used by
.Xr dhclient 8
are always recalculated based on
.Ic epoch
when
.Nm
is processed.
.Pp
.It Ic filename Qq Ar string
The boot filename.
.Pp
.It Ic fixed-address Ar ip-address
The IPv4 address of the lease.
This is required for all lease statements.
The IPv4 address is specified as a dotted quad (e.g. 12.34.56.78).
.Pp
.It Ic next-server Ar ip-address
The IPv4 address of the boot server.
The IPv4 address is specified as a dotted quad (e.g. 12.34.56.78).
.Pp
.It Ic option Ar option option-value
The value of
.Ar option .
DHCP options are described in
.Xr dhcp-options 5 .
.Pp
.It Ic server-name Qq Ar string
The name of the boot server.
.Pp
.It Ic ssid Qq Ar string
The SSID to which the lease applies.
.El
.Sh FILES
.Bl -tag -width "/var/db/dhclient.leases.IFNAME "
.It Pa /var/db/dhclient.leases . Ns Aq Ar IFNAME
Persistent database of leases for
.Aq Ar IFNAME .
.El
.Sh SEE ALSO
.Xr dhclient.conf 5 ,
.Xr dhcp-options 5 ,
.Xr dhcpd.conf 5 ,
.Xr dhclient 8 ,
.Xr dhcpd 8

201
sbin/dhclient/dhcp.h
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@ -1,201 +0,0 @@
/* $OpenBSD: dhcp.h,v 1.21 2017/07/24 16:17:35 krw Exp $ */
/* Protocol structures. */
/*
* 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''.
*/
#define DHCP_UDP_OVERHEAD (20 + /* IP header */ \
8) /* UDP header */
#define DHCP_SNAME_LEN 64
#define DHCP_FILE_LEN 128
#define DHCP_FIXED_NON_UDP 236
#define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD)
/* Everything but options. */
#define DHCP_MTU_MAX 1500
#define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN)
/* Respect historical limits on 'search' line in resolv.conf(5) */
#define DHCP_DOMAIN_SEARCH_LEN 1024
#define DHCP_DOMAIN_SEARCH_CNT 6
#define BOOTP_MIN_LEN 300
struct dhcp_packet {
uint8_t op; /* Message opcode/type */
uint8_t htype; /* Hardware addr type (see net/if_types.h) */
uint8_t hlen; /* Hardware addr length */
uint8_t hops; /* Number of relay agent hops from client */
uint32_t xid; /* Transaction ID */
uint16_t secs; /* Seconds since client started looking */
uint16_t flags; /* Flag bits */
struct in_addr ciaddr; /* Client IP address (if already in use) */
struct in_addr yiaddr; /* Client IP address */
struct in_addr siaddr; /* IP address of next server to talk to */
struct in_addr giaddr; /* DHCP relay agent IP address */
unsigned char chaddr[16]; /* Client hardware address */
char sname[DHCP_SNAME_LEN]; /* Server name */
char file[DHCP_FILE_LEN]; /* Boot filename */
unsigned char options[DHCP_OPTION_LEN];
/* Optional parameters
(actual length dependent on MTU). */
};
/* BOOTP (rfc951) message types */
#define BOOTREQUEST 1
#define BOOTREPLY 2
/* Possible values for flags field. */
#define BOOTP_BROADCAST 32768L
/* Possible values for hardware type (htype) field. */
#define HTYPE_ETHER 1 /* Ethernet */
#define HTYPE_IPSEC_TUNNEL 31 /* IPsec Tunnel (RFC3456) */
/*
* Magic cookie validating dhcp options field (and bootp vendor
* extensions field).
*/
#define DHCP_OPTIONS_COOKIE "\143\202\123\143"
#define DHCP_OPTIONS_COOKIE_LEN 4
#define DHCP_OPTIONS_MESSAGE_TYPE "\065\001\000"
/* DHCP Option codes: */
#define DHO_PAD 0
#define DHO_SUBNET_MASK 1
#define DHO_TIME_OFFSET 2
#define DHO_ROUTERS 3
#define DHO_TIME_SERVERS 4
#define DHO_NAME_SERVERS 5
#define DHO_DOMAIN_NAME_SERVERS 6
#define DHO_LOG_SERVERS 7
#define DHO_COOKIE_SERVERS 8
#define DHO_LPR_SERVERS 9
#define DHO_IMPRESS_SERVERS 10
#define DHO_RESOURCE_LOCATION_SERVERS 11
#define DHO_HOST_NAME 12
#define DHO_BOOT_SIZE 13
#define DHO_MERIT_DUMP 14
#define DHO_DOMAIN_NAME 15
#define DHO_SWAP_SERVER 16
#define DHO_ROOT_PATH 17
#define DHO_EXTENSIONS_PATH 18
#define DHO_IP_FORWARDING 19
#define DHO_NON_LOCAL_SOURCE_ROUTING 20
#define DHO_POLICY_FILTER 21
#define DHO_MAX_DGRAM_REASSEMBLY 22
#define DHO_DEFAULT_IP_TTL 23
#define DHO_PATH_MTU_AGING_TIMEOUT 24
#define DHO_PATH_MTU_PLATEAU_TABLE 25
#define DHO_INTERFACE_MTU 26
#define DHO_ALL_SUBNETS_LOCAL 27
#define DHO_BROADCAST_ADDRESS 28
#define DHO_PERFORM_MASK_DISCOVERY 29
#define DHO_MASK_SUPPLIER 30
#define DHO_ROUTER_DISCOVERY 31
#define DHO_ROUTER_SOLICITATION_ADDRESS 32
#define DHO_STATIC_ROUTES 33
#define DHO_TRAILER_ENCAPSULATION 34
#define DHO_ARP_CACHE_TIMEOUT 35
#define DHO_IEEE802_3_ENCAPSULATION 36
#define DHO_DEFAULT_TCP_TTL 37
#define DHO_TCP_KEEPALIVE_INTERVAL 38
#define DHO_TCP_KEEPALIVE_GARBAGE 39
#define DHO_NIS_DOMAIN 40
#define DHO_NIS_SERVERS 41
#define DHO_NTP_SERVERS 42
#define DHO_VENDOR_ENCAPSULATED_OPTIONS 43
#define DHO_NETBIOS_NAME_SERVERS 44
#define DHO_NETBIOS_DD_SERVER 45
#define DHO_NETBIOS_NODE_TYPE 46
#define DHO_NETBIOS_SCOPE 47
#define DHO_FONT_SERVERS 48
#define DHO_X_DISPLAY_MANAGER 49
#define DHO_DHCP_REQUESTED_ADDRESS 50
#define DHO_DHCP_LEASE_TIME 51
#define DHO_DHCP_OPTION_OVERLOAD 52
#define DHO_DHCP_MESSAGE_TYPE 53
#define DHO_DHCP_SERVER_IDENTIFIER 54
#define DHO_DHCP_PARAMETER_REQUEST_LIST 55
#define DHO_DHCP_MESSAGE 56
#define DHO_DHCP_MAX_MESSAGE_SIZE 57
#define DHO_DHCP_RENEWAL_TIME 58
#define DHO_DHCP_REBINDING_TIME 59
#define DHO_DHCP_CLASS_IDENTIFIER 60
#define DHO_DHCP_CLIENT_IDENTIFIER 61
#define DHO_NISPLUS_DOMAIN 64
#define DHO_NISPLUS_SERVERS 65
#define DHO_TFTP_SERVER 66
#define DHO_BOOTFILE_NAME 67
#define DHO_MOBILE_IP_HOME_AGENT 68
#define DHO_SMTP_SERVER 69
#define DHO_POP_SERVER 70
#define DHO_NNTP_SERVER 71
#define DHO_WWW_SERVER 72
#define DHO_FINGER_SERVER 73
#define DHO_IRC_SERVER 74
#define DHO_STREETTALK_SERVER 75
#define DHO_STREETTALK_DIRECTORY_ASSISTANCE_SERVER 76
#define DHO_DHCP_USER_CLASS_ID 77
#define DHO_RELAY_AGENT_INFORMATION 82
#define DHO_NDS_SERVERS 85
#define DHO_NDS_TREE_NAME 86
#define DHO_NDS_CONTEXT 87
#define DHO_DOMAIN_SEARCH 119
#define DHO_CLASSLESS_STATIC_ROUTES 121
#define DHO_TFTP_CONFIG_FILE 144
#define DHO_VOIP_CONFIGURATION_SERVER 150
#define DHO_CLASSLESS_MS_STATIC_ROUTES 249
#define DHO_AUTOPROXY_SCRIPT 252
#define DHO_END 255
#define DHO_COUNT 256 /* # of DHCP options */
/* DHCP message types. */
#define DHCPDISCOVER 1
#define DHCPOFFER 2
#define DHCPREQUEST 3
#define DHCPDECLINE 4
#define DHCPACK 5
#define DHCPNAK 6
#define DHCPRELEASE 7
#define DHCPINFORM 8
/* Relay Agent Information sub-options */
#define RAI_CIRCUIT_ID 1
#define RAI_REMOTE_ID 2
#define RAI_AGENT_ID 3

255
sbin/dhclient/dhcpd.h
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@ -1,255 +0,0 @@
/* $OpenBSD: dhcpd.h,v 1.299 2021/03/28 16:23:05 krw Exp $ */
/*
* Copyright (c) 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''.
*/
#define LOCAL_PORT 68
#define REMOTE_PORT 67
#define TERMINATE 1
#define RESTART 2
#define DB_TIMEFMT "%w %Y/%m/%d %T UTC"
#define RT_BUF_SIZE 2048
struct option_data {
unsigned int len;
uint8_t *data;
};
struct reject_elem {
TAILQ_ENTRY(reject_elem) next;
struct in_addr addr;
};
struct client_lease {
TAILQ_ENTRY(client_lease) next;
time_t epoch;
struct in_addr address;
struct in_addr next_server;
char *server_name;
char *filename;
char ssid[32];
uint8_t ssid_len;
struct option_data options[DHO_COUNT];
};
#define BOOTP_LEASE(l) ((l)->options[DHO_DHCP_MESSAGE_TYPE].len == 0)
/* Possible states in which the client can be. */
enum dhcp_state {
S_PREBOOT,
S_REBOOTING,
S_INIT,
S_SELECTING,
S_REQUESTING,
S_BOUND,
S_RENEWING
};
enum actions {
ACTION_USELEASE,
ACTION_DEFAULT,
ACTION_SUPERSEDE,
ACTION_PREPEND,
ACTION_APPEND,
ACTION_IGNORE
};
TAILQ_HEAD(client_lease_tq, client_lease);
struct client_config {
struct option_data defaults[DHO_COUNT];
enum actions default_actions[DHO_COUNT];
struct in_addr address;
struct in_addr next_server;
struct option_data send_options[DHO_COUNT];
uint8_t required_options[DHO_COUNT];
uint8_t requested_options[DHO_COUNT];
int requested_option_count;
int required_option_count;
time_t offer_interval;
time_t initial_interval;
time_t link_interval;
time_t retry_interval;
time_t select_interval;
time_t reboot_interval;
time_t backoff_cutoff;
TAILQ_HEAD(, reject_elem) reject_list;
char *filename;
char *server_name;
};
struct interface_info {
struct ether_addr hw_address;
char name[IFNAMSIZ];
char ssid[32];
uint8_t ssid_len;
int bpffd; /* bpf - reading & broadcast writing*/
int udpfd; /* udp - unicast writing */
unsigned char *rbuf;
size_t rbuf_max;
int errors;
uint16_t index;
int link_state;
int rdomain;
int flags;
#define IFI_IN_CHARGE 0x01
uint32_t mtu;
struct dhcp_packet recv_packet;
struct dhcp_packet sent_packet;
int sent_packet_length;
uint32_t xid;
struct timespec timeout;
struct timespec reboot_timeout;
struct timespec expiry;
struct timespec rebind;
struct timespec renew;
void (*timeout_func)(struct interface_info *);
uint16_t secs;
struct timespec first_sending;
struct timespec link_timeout;
struct timespec offer_timeout;
struct timespec select_timeout;
enum dhcp_state state;
struct in_addr destination;
time_t interval;
struct in_addr requested_address;
struct client_lease *active;
struct client_lease *offer;
char *offer_src;
struct proposal *configured;
struct unwind_info *unwind_info;
struct client_lease_tq lease_db;
};
#define _PATH_DHCLIENT_CONF "/etc/dhclient.conf"
#define _PATH_LEASE_DB "/var/db/dhclient.leases"
/* options.c */
int pack_options(unsigned char *, int,
struct option_data *);
struct option_data *unpack_options(struct dhcp_packet *);
char *pretty_print_option(unsigned int, struct option_data *,
int);
char *pretty_print_string(unsigned char *, size_t, int);
char *code_to_name(int);
char *code_to_format(int);
int code_to_action(int, int);
int name_to_code(char *);
void merge_option_data(char *, struct option_data *,
struct option_data *, struct option_data *);
/* conflex.c */
extern int lexline, lexchar;
extern char *token_line, *tlname;
void new_parse(char *);
int next_token(char **, FILE *);
int peek_token(char **, FILE *);
/* parse.c */
void skip_to_semi(FILE *);
int parse_semi(FILE *);
int parse_string(FILE *, char **);
int parse_ip_addr(FILE *, struct in_addr *);
int parse_cidr(FILE *, unsigned char *);
int parse_number(FILE *, long long *, long long, long long);
int parse_boolean(FILE *, unsigned char *);
void parse_warn(char *);
/* bpf.c */
int get_bpf_sock(char *);
int get_udp_sock(int);
int configure_bpf_sock(int);
ssize_t send_packet(struct interface_info *, struct in_addr,
struct in_addr, const char *);
ssize_t receive_packet(unsigned char *, unsigned char *,
struct sockaddr_in *, struct ether_addr *, struct dhcp_packet *);
/* dispatch.c */
void dispatch(struct interface_info *, int);
void set_timeout( struct interface_info *, time_t,
void (*)(struct interface_info *));
void cancel_timeout(struct interface_info *);
/* dhclient.c */
extern char *path_dhclient_conf;
extern char *path_lease_db;
extern char *log_procname;
extern struct client_config *config;
extern struct imsgbuf *unpriv_ibuf;
extern int quit;
extern int cmd_opts;
#define OPT_NOACTION 0x01
#define OPT_VERBOSE 0x02
#define OPT_FOREGROUND 0x04
#define OPT_RELEASE 0x08
void dhcpoffer(struct interface_info *, struct option_data *,
const char *);
void dhcpack(struct interface_info *, struct option_data *,
const char *);
void dhcpnak(struct interface_info *, const char *);
void bootreply(struct interface_info *, struct option_data *,
const char *);
void free_client_lease(struct client_lease *);
void routefd_handler(struct interface_info *, int);
void state_preboot(struct interface_info *);
char *rfc1035_as_string(unsigned char *, size_t);
/* packet.c */
void assemble_eh_header(struct ether_addr, struct ether_header *);
ssize_t decode_udp_ip_header(unsigned char *, uint32_t,
struct sockaddr_in *);
uint32_t checksum(unsigned char *, uint32_t, uint32_t);
uint32_t wrapsum(uint32_t);
/* clparse.c */
void init_config(void);
void read_conf(char *, uint8_t *, struct ether_addr *);
void read_lease_db(struct client_lease_tq *);
/* kroute.c */
unsigned int extract_route(uint8_t *, unsigned int, in_addr_t *,
in_addr_t *, in_addr_t *);
void write_resolv_conf(void);
void propose(struct proposal *);
void revoke_proposal(struct proposal *);
void tell_unwind(struct unwind_info *, int);

82
sbin/dhclient/dhctoken.h
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/* $OpenBSD: dhctoken.h,v 1.16 2019/01/26 23:26:20 krw Exp $ */
/* Tokens for config file lexer and parser. */
/*
* 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''.
*/
#define TOK_FIRST_TOKEN TOK_FILENAME
#define TOK_FILENAME 257
#define TOK_FIXED_ADDR 259
#define TOK_OPTION 260
#define TOK_STRING 262
#define TOK_NUMBER 263
#define TOK_NUMBER_OR_NAME 264
#define TOK_NAME 265
#define TOK_LEASE 266
#define TOK_SERVER_NAME 267
#define TOK_SEND 269
#define TOK_REQUEST 270
#define TOK_REQUIRE 271
#define TOK_TIMEOUT 272
#define TOK_RETRY 273
#define TOK_SELECT_TIMEOUT 274
#define TOK_NEXT_SERVER 275
#define TOK_INTERFACE 276
#define TOK_RENEW 277
#define TOK_REBIND 278
#define TOK_EXPIRE 279
#define TOK_BOOTP 280
#define TOK_DEFAULT 282
#define TOK_REBOOT 286
#define TOK_BACKOFF_CUTOFF 287
#define TOK_INITIAL_INTERVAL 288
#define TOK_SUPERSEDE 289
#define TOK_APPEND 290
#define TOK_PREPEND 291
#define TOK_REJECT 292
#define TOK_LINK_TIMEOUT 294
#define TOK_IGNORE 295
#define TOK_SSID 296
#define TOK_EPOCH 297
#define TOK_USELEASE 298
#define is_identifier(x) ((x) >= TOK_FIRST_TOKEN && \
(x) != TOK_STRING && \
(x) != TOK_NUMBER && \
(x) != EOF)

322
sbin/dhclient/dispatch.c
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@ -1,322 +0,0 @@
/* $OpenBSD: dispatch.c,v 1.172 2021/03/28 17:25:21 krw 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''.
*/
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_media.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <errno.h>
#include <imsg.h>
#include <limits.h>
#include <poll.h>
#include <resolv.h>
#include <signal.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dhcp.h"
#include "dhcpd.h"
#include "log.h"
#include "privsep.h"
void bpffd_handler(struct interface_info *);
void dhcp_packet_dispatch(struct interface_info *, struct sockaddr_in *,
struct ether_addr *);
void flush_unpriv_ibuf(void);
/*
* Loop waiting for packets, timeouts or routing messages.
*/
void
dispatch(struct interface_info *ifi, int routefd)
{
const struct timespec link_intvl = {config->link_interval, 0};
struct pollfd fds[3];
struct timespec timeout;
struct timespec *ts;
void (*func)(struct interface_info *);
int nfds;
log_debug("%s: link is %s", log_procname,
LINK_STATE_IS_UP(ifi->link_state) ? "up" : "down");
while (quit == 0 || quit == RESTART) {
if (quit == RESTART) {
quit = 0;
clock_gettime(CLOCK_MONOTONIC, &ifi->link_timeout);
timespecadd(&ifi->link_timeout, &link_intvl, &ifi->link_timeout);
free(ifi->configured);
ifi->configured = NULL;
free(ifi->unwind_info);
ifi->unwind_info = NULL;
ifi->state = S_PREBOOT;
state_preboot(ifi);
}
if (timespecisset(&ifi->timeout)) {
clock_gettime(CLOCK_MONOTONIC, &timeout);
if (timespeccmp(&timeout, &ifi->timeout, >=)) {
func = ifi->timeout_func;
cancel_timeout(ifi);
(*(func))(ifi);
continue;
}
timespecsub(&ifi->timeout, &timeout, &timeout);
ts = &timeout;
} else
ts = NULL;
/*
* Set up the descriptors to be polled.
*
* fds[0] == bpf socket for incoming packets
* fds[1] == routing socket for incoming RTM messages
* fds[2] == imsg socket to privileged process
*/
fds[0].fd = ifi->bpffd;
fds[1].fd = routefd;
fds[2].fd = unpriv_ibuf->fd;
fds[0].events = fds[1].events = fds[2].events = POLLIN;
if (unpriv_ibuf->w.queued)
fds[2].events |= POLLOUT;
nfds = ppoll(fds, 3, ts, NULL);
if (nfds == -1) {
if (errno == EINTR)
continue;
log_warn("%s: ppoll(bpffd, routefd, unpriv_ibuf)",
log_procname);
break;
}
if ((fds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) != 0) {
log_debug("%s: bpffd: ERR|HUP|NVAL", log_procname);
break;
}
if ((fds[1].revents & (POLLERR | POLLHUP | POLLNVAL)) != 0) {
log_debug("%s: routefd: ERR|HUP|NVAL", log_procname);
break;
}
if ((fds[2].revents & (POLLERR | POLLHUP | POLLNVAL)) != 0) {
log_debug("%s: unpriv_ibuf: ERR|HUP|NVAL", log_procname);
break;
}
if (nfds == 0)
continue;
if ((fds[0].revents & POLLIN) != 0)
bpffd_handler(ifi);
if ((fds[1].revents & POLLIN) != 0)
routefd_handler(ifi, routefd);
if ((fds[2].revents & POLLOUT) != 0)
flush_unpriv_ibuf();
if ((fds[2].revents & POLLIN) != 0)
break;
}
}
void
bpffd_handler(struct interface_info *ifi)
{
struct sockaddr_in from;
struct ether_addr hfrom;
unsigned char *next, *lim;
ssize_t n;
n = read(ifi->bpffd, ifi->rbuf, ifi->rbuf_max);
if (n == -1) {
log_warn("%s: read(bpffd)", log_procname);
ifi->errors++;
if (ifi->errors > 20)
fatalx("too many read(bpffd) failures");
return;
}
ifi->errors = 0;
lim = ifi->rbuf + n;
for (next = ifi->rbuf; quit == 0 && n > 0; next += n) {
n = receive_packet(next, lim, &from, &hfrom, &ifi->recv_packet);
if (n > 0)
dhcp_packet_dispatch(ifi, &from, &hfrom);
}
}
void
dhcp_packet_dispatch(struct interface_info *ifi, struct sockaddr_in *from,
struct ether_addr *hfrom)
{
struct in_addr ifrom;
struct dhcp_packet *packet = &ifi->recv_packet;
struct reject_elem *ap;
struct option_data *options;
char *src;
int i, rslt;
ifrom.s_addr = from->sin_addr.s_addr;
if (packet->hlen != ETHER_ADDR_LEN) {
log_debug("%s: discarding packet with hlen == %u", log_procname,
packet->hlen);
return;
} else if (memcmp(&ifi->hw_address, packet->chaddr,
sizeof(ifi->hw_address)) != 0) {
log_debug("%s: discarding packet with chaddr == %s",
log_procname,
ether_ntoa((struct ether_addr *)packet->chaddr));
return;
}
if (ifi->xid != packet->xid) {
log_debug("%s: discarding packet with XID != %u (%u)",
log_procname, ifi->xid, packet->xid);
return;
}
TAILQ_FOREACH(ap, &config->reject_list, next)
if (ifrom.s_addr == ap->addr.s_addr) {
log_debug("%s: discarding packet from address on reject "
"list (%s)", log_procname, inet_ntoa(ifrom));
return;
}
options = unpack_options(&ifi->recv_packet);
/*
* RFC 6842 says if the server sends a client identifier
* that doesn't match then the packet must be dropped.
*/
i = DHO_DHCP_CLIENT_IDENTIFIER;
if ((options[i].len != 0) &&
((options[i].len != config->send_options[i].len) ||
memcmp(options[i].data, config->send_options[i].data,
options[i].len) != 0)) {
log_debug("%s: discarding packet with client-identifier %s'",
log_procname, pretty_print_option(i, &options[i], 0));
return;
}
rslt = asprintf(&src, "%s (%s)", inet_ntoa(ifrom), ether_ntoa(hfrom));
if (rslt == -1)
fatal("src");
i = DHO_DHCP_MESSAGE_TYPE;
if (options[i].data != NULL) {
/* Always try a DHCP packet, even if a bad option was seen. */
switch (options[i].data[0]) {
case DHCPOFFER:
dhcpoffer(ifi, options, src);
break;
case DHCPNAK:
dhcpnak(ifi, src);
break;
case DHCPACK:
dhcpack(ifi, options, src);
break;
default:
log_debug("%s: discarding DHCP packet of unknown type "
"(%d)", log_procname, options[i].data[0]);
break;
}
} else if (packet->op == BOOTREPLY) {
bootreply(ifi, options, src);
} else {
log_debug("%s: discarding packet which is neither DHCP nor "
"BOOTP", log_procname);
}
free(src);
}
/*
* flush_unpriv_ibuf stuffs queued messages into the imsg socket.
*/
void
flush_unpriv_ibuf(void)
{
while (unpriv_ibuf->w.queued) {
if (msgbuf_write(&unpriv_ibuf->w) <= 0) {
if (errno == EAGAIN)
break;
if (quit == 0)
quit = TERMINATE;
if (errno != EPIPE && errno != 0)
log_warn("%s: msgbuf_write(unpriv_ibuf)",
log_procname);
break;
}
}
}
void
set_timeout(struct interface_info *ifi, time_t secs,
void (*where)(struct interface_info *))
{
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
timespecclear(&ifi->timeout);
ifi->timeout.tv_sec = secs;
timespecadd(&ifi->timeout, &now, &ifi->timeout);
ifi->timeout_func = where;
}
void
cancel_timeout(struct interface_info *ifi)
{
timespecclear(&ifi->timeout);
ifi->timeout_func = NULL;
}

1072
sbin/dhclient/kroute.c
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File diff suppressed because it is too large Load Diff

199
sbin/dhclient/log.c
View File

@ -1,199 +0,0 @@
/* $OpenBSD: log.c,v 1.2 2017/03/21 12:06:55 bluhm Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <time.h>
#include "log.h"
static int debug;
static int verbose;
static const char *log_procname;
void
log_init(int n_debug, int facility)
{
extern char *__progname;
debug = n_debug;
verbose = n_debug;
log_procinit(__progname);
if (!debug)
openlog(__progname, LOG_PID | LOG_NDELAY, facility);
tzset();
}
void
log_procinit(const char *procname)
{
if (procname != NULL)
log_procname = procname;
}
void
log_setverbose(int v)
{
verbose = v;
}
int
log_getverbose(void)
{
return (verbose);
}
void
logit(int pri, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vlog(pri, fmt, ap);
va_end(ap);
}
void
vlog(int pri, const char *fmt, va_list ap)
{
char *nfmt;
int saved_errno = errno;
if (debug) {
/* best effort in out of mem situations */
if (asprintf(&nfmt, "%s\n", fmt) == -1) {
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
} else {
vfprintf(stderr, nfmt, ap);
free(nfmt);
}
fflush(stderr);
} else
vsyslog(pri, fmt, ap);
errno = saved_errno;
}
void
log_warn(const char *emsg, ...)
{
char *nfmt;
va_list ap;
int saved_errno = errno;
/* best effort to even work in out of memory situations */
if (emsg == NULL)
logit(LOG_ERR, "%s", strerror(saved_errno));
else {
va_start(ap, emsg);
if (asprintf(&nfmt, "%s: %s", emsg,
strerror(saved_errno)) == -1) {
/* we tried it... */
vlog(LOG_ERR, emsg, ap);
logit(LOG_ERR, "%s", strerror(saved_errno));
} else {
vlog(LOG_ERR, nfmt, ap);
free(nfmt);
}
va_end(ap);
}
errno = saved_errno;
}
void
log_warnx(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vlog(LOG_ERR, emsg, ap);
va_end(ap);
}
void
log_info(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vlog(LOG_INFO, emsg, ap);
va_end(ap);
}
void
log_debug(const char *emsg, ...)
{
va_list ap;
if (verbose) {
va_start(ap, emsg);
vlog(LOG_DEBUG, emsg, ap);
va_end(ap);
}
}
static void
vfatalc(int code, const char *emsg, va_list ap)
{
static char s[BUFSIZ];
const char *sep;
if (emsg != NULL) {
(void)vsnprintf(s, sizeof(s), emsg, ap);
sep = ": ";
} else {
s[0] = '\0';
sep = "";
}
if (code)
logit(LOG_CRIT, "fatal in %s: %s%s%s",
log_procname, s, sep, strerror(code));
else
logit(LOG_CRIT, "fatal in %s%s%s", log_procname, sep, s);
}
void
fatal(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vfatalc(errno, emsg, ap);
va_end(ap);
exit(1);
}
void
fatalx(const char *emsg, ...)
{
va_list ap;
va_start(ap, emsg);
vfatalc(0, emsg, ap);
va_end(ap);
exit(1);
}

45
sbin/dhclient/log.h
View File

@ -1,45 +0,0 @@
/* $OpenBSD: log.h,v 1.2 2021/12/13 18:28:39 deraadt Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef LOG_H
#define LOG_H
#include <stdarg.h>
void log_init(int, int);
void log_procinit(const char *);
void log_setverbose(int);
int log_getverbose(void);
void log_warn(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_warnx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_info(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void log_debug(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
void logit(int, const char *, ...)
__attribute__((__format__ (printf, 2, 3)));
void vlog(int, const char *, va_list)
__attribute__((__format__ (printf, 2, 0)));
__dead void fatal(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
__dead void fatalx(const char *, ...)
__attribute__((__format__ (printf, 1, 2)));
#endif /* LOG_H */

1001
sbin/dhclient/options.c
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File diff suppressed because it is too large Load Diff

215
sbin/dhclient/packet.c
View File

@ -1,215 +0,0 @@
/* $OpenBSD: packet.c,v 1.45 2021/02/22 23:43:59 jsg Exp $ */
/* Packet assembly code, originally contributed by Archie Cobbs. */
/*
* Copyright (c) 1995, 1996, 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''.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/if_ether.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "dhcp.h"
#include "dhcpd.h"
#include "log.h"
uint32_t
checksum(unsigned char *buf, uint32_t nbytes, uint32_t sum)
{
unsigned int i;
/* Checksum all the pairs of bytes first. */
for (i = 0; i < (nbytes & ~1U); i += 2) {
sum += (uint16_t)ntohs(*((uint16_t *)(buf + i)));
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
/*
* If there's a single byte left over, checksum it, too.
* Network byte order is big-endian, so the remaining byte is
* the high byte.
*/
if (i < nbytes) {
sum += buf[i] << 8;
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
return sum;
}
uint32_t
wrapsum(uint32_t sum)
{
sum = ~sum & 0xFFFF;
return htons(sum);
}
void
assemble_eh_header(struct ether_addr shost, struct ether_header *eh)
{
memset(eh->ether_dhost, 0xff, sizeof(eh->ether_dhost));
memcpy(eh->ether_shost, shost.ether_addr_octet,
sizeof(eh->ether_shost));
eh->ether_type = htons(ETHERTYPE_IP);
}
ssize_t
decode_udp_ip_header(unsigned char *buf, uint32_t buflen,
struct sockaddr_in *from)
{
static int ip_packets_seen;
static int ip_packets_bad_checksum;
static int udp_packets_seen;
static int udp_packets_bad_checksum;
static int udp_packets_length_checked;
static int udp_packets_length_overflow;
struct ip *ip;
struct udphdr *udp;
unsigned char *data;
int len;
uint32_t ip_len;
uint32_t sum, usum;
/* Assure that an entire IP header is within the buffer. */
if (sizeof(*ip) > buflen)
return -1;
ip_len = (*buf & 0xf) << 2;
if (ip_len > buflen)
return -1;
ip = (struct ip *)(buf);
ip_packets_seen++;
/* Check the IP header checksum - it should be zero. */
if (wrapsum(checksum((unsigned char *)ip, ip_len, 0)) != 0) {
ip_packets_bad_checksum++;
if (ip_packets_seen > 4 && ip_packets_bad_checksum != 0 &&
(ip_packets_seen / ip_packets_bad_checksum) < 2) {
log_debug("%s: %d bad IP checksums seen in %d packets",
log_procname, ip_packets_bad_checksum,
ip_packets_seen);
ip_packets_seen = ip_packets_bad_checksum = 0;
}
return -1;
}
memcpy(&from->sin_addr, &ip->ip_src, sizeof(from->sin_addr));
if (ntohs(ip->ip_len) != buflen)
log_debug("%s: ip length %hu disagrees with bytes received %d",
log_procname, ntohs(ip->ip_len), buflen);
/* Assure that the entire IP packet is within the buffer. */
if (ntohs(ip->ip_len) > buflen)
return -1;
/* Assure that the UDP header is within the buffer. */
if (ip_len + sizeof(*udp) > buflen)
return -1;
udp = (struct udphdr *)(buf + ip_len);
udp_packets_seen++;
/* Assure that the entire UDP packet is within the buffer. */
if (ip_len + ntohs(udp->uh_ulen) > buflen)
return -1;
data = buf + ip_len + sizeof(*udp);
/*
* Compute UDP checksums, including the ``pseudo-header'', the
* UDP header and the data. If the UDP checksum field is zero,
* we're not supposed to do a checksum.
*/
udp_packets_length_checked++;
len = ntohs(udp->uh_ulen) - sizeof(*udp);
if ((len < 0) || (len + data > buf + buflen)) {
udp_packets_length_overflow++;
if (udp_packets_length_checked > 4 &&
udp_packets_length_overflow != 0 &&
(udp_packets_length_checked /
udp_packets_length_overflow) < 2) {
log_debug("%s: %d udp packets in %d too long - dropped",
log_procname, udp_packets_length_overflow,
udp_packets_length_checked);
udp_packets_length_overflow =
udp_packets_length_checked = 0;
}
return -1;
}
if (len + data != buf + buflen)
log_debug("%s: accepting packet with data after udp payload",
log_procname);
usum = udp->uh_sum;
udp->uh_sum = 0;
sum = wrapsum(checksum((unsigned char *)udp, sizeof(*udp),
checksum(data, len, checksum((unsigned char *)&ip->ip_src,
2 * sizeof(ip->ip_src),
IPPROTO_UDP + (uint32_t)ntohs(udp->uh_ulen)))));
udp_packets_seen++;
if (usum != 0 && usum != sum) {
udp_packets_bad_checksum++;
if (udp_packets_seen > 4 && udp_packets_bad_checksum != 0 &&
(udp_packets_seen / udp_packets_bad_checksum) < 2) {
log_debug("%s: %d bad udp checksums in %d packets",
log_procname, udp_packets_bad_checksum,
udp_packets_seen);
udp_packets_seen = udp_packets_bad_checksum = 0;
}
return -1;
}
memcpy(&from->sin_port, &udp->uh_sport, sizeof(udp->uh_sport));
return ip_len + sizeof(*udp);
}

300
sbin/dhclient/parse.c
View File

@ -1,300 +0,0 @@
/* $OpenBSD: parse.c,v 1.83 2019/07/22 17:20:06 krw Exp $ */
/* Common parser code for dhcpd and dhclient. */
/*
* Copyright (c) 1995, 1996, 1997, 1998 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''.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <vis.h>
#include "dhcp.h"
#include "dhcpd.h"
#include "dhctoken.h"
#include "log.h"
/*
* Skip to the semicolon ending the current statement. If we encounter
* braces, the matching closing brace terminates the statement. If we
* encounter a right brace but haven't encountered a left brace, return
* leaving the brace in the token buffer for the caller. If we see a
* semicolon and haven't seen a left brace, return. This lets us skip
* over:
*
* statement;
* statement foo bar { }
* statement foo bar { statement { } }
* statement}
*
* ...et cetera.
*/
void
skip_to_semi(FILE *cfile)
{
int token;
int brace_count = 0;
do {
token = peek_token(NULL, cfile);
if (token == '}') {
if (brace_count > 0) {
if (--brace_count == 0) {
token = next_token(NULL, cfile);
return;
}
} else
return;
} else if (token == '{') {
brace_count++;
} else if (token == ';' && brace_count == 0) {
token = next_token(NULL, cfile);
return;
}
token = next_token(NULL, cfile);
} while (token != EOF);
}
int
parse_semi(FILE *cfile)
{
int token;
token = next_token(NULL, cfile);
if (token == ';')
return 1;
parse_warn("expecting semicolon.");
skip_to_semi(cfile);
return 0;
}
int
parse_string(FILE *cfile, char **string)
{
static char unvisbuf[1500];
char *val;
int i, token;
token = next_token(&val, cfile);
if (token == TOK_STRING) {
i = strnunvis(unvisbuf, val, sizeof(unvisbuf));
if (i >= 0) {
*string = strdup(unvisbuf);
if (*string == NULL)
fatal("strdup(unvisbuf)");
return 1;
}
}
parse_warn("expecting string.");
if (token != ';')
skip_to_semi(cfile);
return 0;
}
/*
* cidr :== ip-address "/" bit-count
* ip-address :== NUMBER [ DOT NUMBER [ DOT NUMBER [ DOT NUMBER ] ] ]
* bit-count :== 0..32
*/
int
parse_cidr(FILE *cfile, unsigned char *cidr)
{
uint8_t buf[5];
const char *errstr;
char *val;
long long numval;
unsigned int i;
int token;
memset(buf, 0, sizeof(buf));
i = 1; /* Last four octets hold subnet, first octet the # of bits. */
do {
token = next_token(&val, cfile);
if (i == 0)
numval = strtonum(val, 0, 32, &errstr);
else
numval = strtonum(val, 0, UINT8_MAX, &errstr);
if (errstr != NULL)
break;
buf[i++] = numval;
if (i == 1) {
memcpy(cidr, buf, sizeof(buf)); /* XXX Need cidr_t */
return 1;
}
token = next_token(NULL, cfile);
if (token == '/')
i = 0;
if (i == sizeof(buf))
break;
} while (token == '.' || token == '/');
parse_warn("expecting IPv4 CIDR block.");
if (token != ';')
skip_to_semi(cfile);
return 0;
}
int
parse_ip_addr(FILE *cfile, struct in_addr *addr)
{
struct in_addr buf;
const char *errstr;
char *val;
long long numval;
unsigned int i;
int token;
i = 0;
do {
token = next_token(&val, cfile);
numval = strtonum(val, 0, UINT8_MAX, &errstr);
if (errstr != NULL)
break;
((uint8_t *)&buf)[i++] = numval;
if (i == sizeof(buf)) {
memcpy(addr, &buf, sizeof(*addr));
return 1;
}
token = next_token(NULL, cfile);
} while (token == '.');
parse_warn("expecting IPv4 address.");
if (token != ';')
skip_to_semi(cfile);
return 0;
}
int
parse_boolean(FILE *cfile, unsigned char *buf)
{
char *val;
int token;
token = next_token(&val, cfile);
if (is_identifier(token) != 0) {
if (strcasecmp(val, "true") == 0 ||
strcasecmp(val, "on") == 0) {
buf[0] = 1;
return 1;
}
if (strcasecmp(val, "false") == 0 ||
strcasecmp(val, "off") == 0) {
buf[0] = 0;
return 1;
}
}
parse_warn("expecting boolean.");
if (token != ';')
skip_to_semi(cfile);
return 0;
}
int
parse_number(FILE *cfile, long long *number, long long low, long long high)
{
const char *errstr;
char *val, *msg;
int rslt, token;
long long numval;
token = next_token(&val, cfile);
numval = strtonum(val, low, high, &errstr);
if (errstr == NULL) {
*number = numval;
return 1;
}
rslt = asprintf(&msg, "expecting integer between %lld and %lld", low,
high);
if (rslt != -1) {
parse_warn(msg);
free(msg);
}
if (token != ';')
skip_to_semi(cfile);
return 0;
}
void
parse_warn(char *msg)
{
static char spaces[81];
unsigned int i;
log_warnx("%s: %s line %d: %s", log_procname, tlname, lexline, msg);
log_warnx("%s: %s", log_procname, token_line);
if ((unsigned int)lexchar < sizeof(spaces)) {
memset(spaces, 0, sizeof(spaces));
for (i = 0; (int)i < lexchar - 1; i++) {
if (token_line[i] == '\t')
spaces[i] = '\t';
else
spaces[i] = ' ';
}
log_warnx("%s: %s^", log_procname, spaces);
}
}

114
sbin/dhclient/privsep.c
View File

@ -1,114 +0,0 @@
/* $OpenBSD: privsep.c,v 1.79 2020/11/21 18:34:25 krw Exp $ */
/*
* Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE, ABUSE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <errno.h>
#include <imsg.h>
#include <resolv.h>
#include <signal.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "dhcp.h"
#include "dhcpd.h"
#include "log.h"
#include "privsep.h"
void
dispatch_imsg(char *name, int rdomain, int ioctlfd, int routefd,
struct imsgbuf *ibuf)
{
static char *resolv_conf;
static int lastidx;
struct imsg imsg;
ssize_t n;
int index;
index = if_nametoindex(name);
if (index == 0) {
log_warnx("%s: unknown interface", log_procname);
quit = TERMINATE;
return;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_REVOKE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct proposal))
log_warnx("%s: bad IMSG_REVOKE",
log_procname);
else
priv_revoke_proposal(name, ioctlfd, imsg.data,
&resolv_conf);
break;
case IMSG_PROPOSE:
if (imsg.hdr.len < IMSG_HEADER_SIZE +
sizeof(struct proposal))
log_warnx("%s: bad IMSG_PROPOSE",
log_procname);
else {
priv_propose(name, ioctlfd, imsg.data,
imsg.hdr.len - IMSG_HEADER_SIZE - sizeof(struct proposal),
&resolv_conf, routefd, rdomain, index, &lastidx);
}
break;
case IMSG_WRITE_RESOLV_CONF:
if (imsg.hdr.len != IMSG_HEADER_SIZE)
log_warnx("%s: bad IMSG_WRITE_RESOLV_CONF",
log_procname);
else
priv_write_resolv_conf(index, routefd, rdomain,
resolv_conf, &lastidx);
break;
case IMSG_TELL_UNWIND:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct unwind_info))
log_warnx("%s: bad IMSG_TELL_UNWIND",
log_procname);
else
priv_tell_unwind(index, routefd, rdomain, imsg.data);
break;
default:
log_warnx("%s: received unknown message, code %u",
log_procname, imsg.hdr.type);
}
imsg_free(&imsg);
}
}

49
sbin/dhclient/privsep.h
View File

@ -1,49 +0,0 @@
/* $OpenBSD: privsep.h,v 1.70 2020/11/21 18:34:25 krw Exp $ */
/*
* Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE, ABUSE OR PERFORMANCE OF THIS SOFTWARE.
*/
enum imsg_code {
IMSG_NONE,
IMSG_REVOKE,
IMSG_WRITE_RESOLV_CONF,
IMSG_PROPOSE,
IMSG_TELL_UNWIND
};
struct proposal {
struct in_addr address;
struct in_addr netmask;
unsigned int routes_len;
unsigned int domains_len;
unsigned int ns_len;
int mtu;
};
struct unwind_info {
in_addr_t ns[MAXNS];
unsigned int count;
};
void dispatch_imsg(char *, int, int, int, struct imsgbuf *);
void priv_write_resolv_conf(int, int, int, char *, int *);
void priv_propose(char *, int, struct proposal *, size_t, char **, int, int,
int, int *);
void priv_revoke_proposal(char *, int, struct proposal *, char **);
void priv_tell_unwind(int, int, int, struct unwind_info *);