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5aabfc78bc90d34f64dc43a9851556dde1aa103e
dnsmasq/src/config.h
Simon Kelley 5aabfc78bc import of dnsmasq-2.40.tar.gz
2012-01-05 17:31:13 +00:00

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/* dnsmasq is Copyright (c) 2000-2007 Simon Kelley
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#define VERSION "2.40"
#define FTABSIZ 150 /* max number of outstanding requests (default) */
#define MAX_PROCS 20 /* max no children for TCP requests */
#define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
#define EDNS_PKTSZ 1280 /* default max EDNS.0 UDP packet from RFC2671 */
#define TIMEOUT 10 /* drop UDP queries after TIMEOUT seconds */
#define LEASE_RETRY 60 /* on error, retry writing leasefile after LEASE_RETRY seconds */
#define CACHESIZ 150 /* default cache size */
#define MAXLEASES 150 /* maximum number of DHCP leases */
#define PING_WAIT 3 /* wait for ping address-in-use test */
#define PING_CACHE_TIME 30 /* Ping test assumed to be valid this long. */
#define DECLINE_BACKOFF 600 /* disable DECLINEd static addresses for this long */
#define DHCP_PACKET_MAX 16384 /* hard limit on DHCP packet size */
#define SMALLDNAME 40 /* most domain names are smaller than this */
#define HOSTSFILE "/etc/hosts"
#define ETHERSFILE "/etc/ethers"
#ifdef __uClinux__
# define RESOLVFILE "/etc/config/resolv.conf"
#else
# define RESOLVFILE "/etc/resolv.conf"
#endif
#define RUNFILE "/var/run/dnsmasq.pid"
#if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__)
# define LEASEFILE "/var/db/dnsmasq.leases"
#else
# define LEASEFILE "/var/lib/misc/dnsmasq.leases"
#endif
#if defined(__FreeBSD__)
# define CONFFILE "/usr/local/etc/dnsmasq.conf"
#else
# define CONFFILE "/etc/dnsmasq.conf"
#endif
#define DEFLEASE 3600 /* default lease time, 1 hour */
#define CHUSER "nobody"
#define CHGRP "dip"
#define DHCP_SERVER_PORT 67
#define DHCP_CLIENT_PORT 68
#define TFTP_PORT 69
#define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
#define LOG_MAX 5 /* log-queue length */
/* DBUS interface specifics */
#define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq"
#define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
/* A small collection of RR-types which are missing on some platforms */
#ifndef T_SIG
# define T_SIG 24
#endif
#ifndef T_SRV
# define T_SRV 33
#endif
#ifndef T_OPT
# define T_OPT 41
#endif
#ifndef T_TKEY
# define T_TKEY 249
#endif
#ifndef T_TSIG
# define T_TSIG 250
#endif
/* Get linux C library versions. */
#if defined(__linux__) && !defined(__UCLIBC__) && !defined(__uClinux__)
/*# include <libio.h> */
# include <features.h>
#endif
/* Follows system specific switches. If you run on a
new system, you may want to edit these.
May replace this with Autoconf one day.
HAVE_LINUX_NETWORK
define this to do networking the Linux way. When it's defined, the code will
use IP_PKTINFO, Linux capabilities and the RTnetlink system. If it's not defined,
a few facilities will be lost, namely support for multiple addresses on an interface,
DNS query retransmission, and (on some systems) wildcard interface binding.
HAVE_BROKEN_RTC
define this on embedded systems which don't have an RTC
which keeps time over reboots. Causes dnsmasq to use uptime
for timing, and keep lease lengths rather than expiry times
in its leases file. This also make dnsmasq "flash disk friendly".
Normally, dnsmasq tries very hard to keep the on-disk leases file
up-to-date: rewriting it after every renewal. When HAVE_BROKEN_RTC
is in effect, the lease file is only written when a new lease is
created, or an old one destroyed. (Because those are the only times
it changes.) This vastly reduces the number of file writes, and makes
it viable to keep the lease file on a flash filesystem.
NOTE: when enabling or disabling this, be sure to delete any old
leases file, otherwise dnsmasq may get very confused.
HAVE_ISC_READER
define this to include the old ISC dhcpcd integration. Note that you cannot
set both HAVE_ISC_READER and HAVE_BROKEN_RTC.
HAVE_TFTP
define this to get dnsmasq's built-in TFTP server.
HAVE_GETOPT_LONG
define this if you have GNU libc or GNU getopt.
HAVE_ARC4RANDOM
define this if you have arc4random() to get better security from DNS spoofs
by using really random ids (OpenBSD)
HAVE_RANDOM
define this if you have the 4.2BSD random() function (and its
associated srandom() function), which is at least as good as (if not
better than) the rand() function.
HAVE_DEV_RANDOM
define this if you have the /dev/random device, which gives truly
random numbers but may run out of random numbers.
HAVE_DEV_URANDOM
define this if you have the /dev/urandom device, which gives
semi-random numbers when it runs out of truly random numbers.
HAVE_SOCKADDR_SA_LEN
define this if struct sockaddr has sa_len field (*BSD)
HAVE_DBUS
Define this if you want to link against libdbus, and have dnsmasq
define some methods to allow (re)configuration of the upstream DNS
servers via DBus.
NOTES:
For Linux you should define
HAVE_LINUX_NETWORK
HAVE_GETOPT_LONG
HAVE_RANDOM
HAVE_DEV_RANDOM
HAVE_DEV_URANDOM
you should NOT define
HAVE_ARC4RANDOM
HAVE_SOCKADDR_SA_LEN
For *BSD systems you should define
HAVE_SOCKADDR_SA_LEN
HAVE_RANDOM
you should NOT define
HAVE_LINUX_NETWORK
and you MAY define
HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later
HAVE_DEV_URANDOM - OpenBSD and FreeBSD and NetBSD
HAVE_DEV_RANDOM - FreeBSD and NetBSD
(OpenBSD with hardware random number generator)
HAVE_GETOPT_LONG - NetBSD, later FreeBSD
(FreeBSD and OpenBSD only if you link GNU getopt)
*/
/* platform independent options- uncomment to enable */
#define HAVE_TFTP
/* #define HAVE_BROKEN_RTC */
/* #define HAVE_ISC_READER */
/* #define HAVE_DBUS */
#if defined(HAVE_BROKEN_RTC) && defined(HAVE_ISC_READER)
# error HAVE_ISC_READER is not compatible with HAVE_BROKEN_RTC
#endif
/* Allow TFTP to be disabled with COPT=-DNO_TFTP */
#ifdef NO_TFTP
#undef HAVE_TFTP
#endif
/* platform dependent options. */
/* Must preceed __linux__ since uClinux defines __linux__ too. */
#if defined(__uClinux__)
#define HAVE_LINUX_NETWORK
#define HAVE_GETOPT_LONG
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
/* Never use fork() on uClinux. Note that this is subtly different from the
--keep-in-foreground option, since it also suppresses forking new
processes for TCP connections and disables the call-a-script on leasechange
system. It's intended for use on MMU-less kernels. */
#define NO_FORK
#elif defined(__UCLIBC__)
#define HAVE_LINUX_NETWORK
#if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
# define HAVE_GETOPT_LONG
#else
# undef HAVE_GETOPT_LONG
#endif
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
#if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
# define NO_FORK
#endif
#if defined(__UCLIBC_HAS_IPV6__)
# ifndef IPV6_V6ONLY
# define IPV6_V6ONLY 26
# endif
#endif
/* This is for glibc 2.x */
#elif defined(__linux__)
#define HAVE_LINUX_NETWORK
#define HAVE_GETOPT_LONG
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
/* glibc < 2.2 has broken Sockaddr_in6 so we have to use our own. */
/* glibc < 2.2 doesn't define in_addr_t */
#if defined(__GLIBC__) && (__GLIBC__ == 2) && \
defined(__GLIBC_MINOR__) && (__GLIBC_MINOR__ < 2)
typedef unsigned long in_addr_t;
# define HAVE_BROKEN_SOCKADDR_IN6
#endif
#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#undef HAVE_LINUX_NETWORK
/* Later verions of FreeBSD have getopt_long() */
#if defined(optional_argument) && defined(required_argument)
# define HAVE_GETOPT_LONG
#else
# undef HAVE_GETOPT_LONG
#endif
#define HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_SOCKADDR_SA_LEN
#elif defined(__APPLE__)
#undef HAVE_LINUX_NETWORK
#undef HAVE_GETOPT_LONG
#define HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_SOCKADDR_SA_LEN
/* Define before sys/socket.h is included so we get socklen_t */
#define _BSD_SOCKLEN_T_
/* This is not defined in Mac OS X arpa/nameserv.h */
#define IN6ADDRSZ 16
#elif defined(__NetBSD__)
#undef HAVE_LINUX_NETWORK
#define HAVE_GETOPT_LONG
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#define HAVE_SOCKADDR_SA_LEN
#endif
/* Decide if we're going to support IPv6 */
/* IPv6 can be forced off with "make COPTS=-DNO_IPV6" */
/* We assume that systems which don't have IPv6
headers don't have ntop and pton either */
#if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6)
# define HAVE_IPV6
# define ADDRSTRLEN INET6_ADDRSTRLEN
# if defined(SOL_IPV6)
# define IPV6_LEVEL SOL_IPV6
# else
# define IPV6_LEVEL IPPROTO_IPV6
# endif
#elif defined(INET_ADDRSTRLEN)
# undef HAVE_IPV6
# define ADDRSTRLEN INET_ADDRSTRLEN
#else
# undef HAVE_IPV6
# define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
#endif
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