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e17fb629a2ffb3c12faa4e83da529e7c73841949
dnsmasq/src/config.h
Simon Kelley e17fb629a2 import of dnsmasq-2.25.tar.gz
2012-01-05 17:31:11 +00:00

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/* dnsmasq is Copyright (c) 2000-2006 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.
*/
/* Author's email: simon@thekelleys.org.uk */
#define VERSION "2.25"
#define FTABSIZ 150 /* max number of outstanding requests */
#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 20 /* drop UDP queries after TIMEOUT seconds */
#define LOGRATE 120 /* log table overflows every LOGRATE seconds */
#define CACHESIZ 150 /* default cache size */
#define MAXTOK 50 /* token in DHCP leases */
#define MAXLEASES 150 /* maximum number of DHCP leases */
#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__)
# 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 IP6INTERFACES "/proc/net/if_inet6"
#define UPTIME "/proc/uptime"
#define DHCP_SERVER_PORT 67
#define DHCP_CLIENT_PORT 68
/* DBUS interface specifics */
#define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq"
#define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
/* Logfile stuff - change this to change the options and facility */
/* debug is true if the --no-daemon flag is given */
#ifdef LOG_PERROR
# define DNSMASQ_LOG_OPT(debug) (debug) ? LOG_PERROR : LOG_PID
#else
# define DNSMASQ_LOG_OPT(debug) (debug) ? 0 : LOG_PID
#endif
#ifdef LOG_LOCAL0
# define DNSMASQ_LOG_FAC(debug) (debug) ? LOG_LOCAL0 : LOG_DAEMON
#else
# define DNSMASQ_LOG_FAC(debug) LOG_DAEMON
#endif
/* A small collection of RR-types which are missing on some platforms */
#ifndef T_SRV
# define T_SRV 33
#endif
#ifndef T_OPT
# define T_OPT 41
#endif
/* Get linux C library versions. */
#if defined(__linux__) && !defined(__UCLIBC__) && !defined(__uClinux__)
# include <libio.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_IPV6_PROC
define this to do IPv6 interface discovery using
proc/net/if_inet6 ala LINUX.
HAVE_BROKEN_RTC
define this on embeded systems which don't have an RTC
which keeps time over reboots. Causes dnsmasq to use uptime()
for timing, and keep relative time values in its leases file.
Also enables "Flash disk mode". Normally, dnsmasq tries very hard to
keep the on-disk leases file up-to-date: rewriting it after every change.
When HAVE_BROKEN_RTC is in effect, a different regime is used:
The leases file is written when dnsmasq terminates, when it receives
SIGALRM, when a brand new lease is allocated, or every n seconds,
where n is one third of the smallest time configured for leases
in a --dhcp-range or --dhcp-host option.
NOTE: when enabling or disabling this, be sure to delete any old
leases file, otherwise dnsmasq may get very confused.
This configuration currently only works on Linux, but could be made to
work on other systems by teaching dnsmasq_time() in utils.c how to
read the system uptime.
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_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_PSELECT
If your C library implements pselect, define this.
HAVE_BPF
If your OS implements Berkeley Packet filter, define this.
HAVE_RTNETLINK
If your OS has the Linux Routing netlink socket API and suitable
C library headers, define this. Note that the code will fall
back to the Berkley API at runtime if netlink support is not
configured into the kernel.
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_IPV6_PROC
HAVE_GETOPT_LONG
HAVE_RANDOM
HAVE_DEV_RANDOM
HAVE_DEV_URANDOM
HAVE_RTNETLINK
you should NOT define
HAVE_ARC4RANDOM
HAVE_SOCKADDR_SA_LEN
For *BSD systems you should define
HAVE_SOCKADDR_SA_LEN
HAVE_RANDOM
HAVE_BPF
you should NOT define
HAVE_LINUX_IPV6_PROC
HAVE_RTNETLINK
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. */
#undef HAVE_BROKEN_RTC
#define HAVE_ISC_READER
#undef HAVE_DBUS
#if defined(HAVE_BROKEN_RTC) && defined(HAVE_ISC_READER)
# error HAVE_ISC_READER is not compatible with HAVE_BROKEN_RTC
#endif
/* platform dependent options. */
/* Must preceed __linux__ since uClinux defines __linux__ too. */
#if defined(__uClinux__)
#define HAVE_LINUX_IPV6_PROC
#define HAVE_GETOPT_LONG
#define HAVE_RTNETLINK
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
#undef HAVE_PSELECT
/* 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. It's intended for use on MMU-less kernels. */
#define NO_FORK
#elif defined(__UCLIBC__)
#define HAVE_LINUX_IPV6_PROC
#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
#define HAVE_RTNETLINK
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
#undef HAVE_PSELECT
#if !defined(__ARCH_HAS_MMU__)
# define NO_FORK
#endif
#if !defined(__UCLIBC_HAS_IPV6__)
# define NO_IPV6
#endif
/* libc5 - must precede __linux__ too */
/* Note to build a libc5 binary on a modern Debian system:
install the packages altgcc libc5 and libc5-altdev
then run "make CC=i486-linuxlibc1-gcc" */
/* Note that compling dnsmasq 2.x under libc5 and kernel 2.0.x
is probably doomed - no packet socket for starters. */
#elif defined(__linux__) && \
defined(_LINUX_C_LIB_VERSION_MAJOR) && \
(_LINUX_C_LIB_VERSION_MAJOR == 5 )
#undef HAVE_IPV6
#undef HAVE_LINUX_IPV6_PROC
#undef HAVE_RTNETLINK
#define HAVE_GETOPT_LONG
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
#undef HAVE_PSELECT
/* Fix various misfeatures of libc5 headers */
typedef unsigned long in_addr_t;
typedef size_t socklen_t;
/* This is for glibc 2.x */
#elif defined(__linux__)
#define HAVE_LINUX_IPV6_PROC
#define HAVE_RTNETLINK
#define HAVE_GETOPT_LONG
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
#define HAVE_PSELECT
/* 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__)
#undef HAVE_LINUX_IPV6_PROC
#undef HAVE_RTNETLINK
/* 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
#undef HAVE_PSELECT
#define HAVE_BPF
#elif defined(__APPLE__)
#undef HAVE_LINUX_IPV6_PROC
#undef HAVE_RTNETLINK
#undef HAVE_GETOPT_LONG
#define HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_SOCKADDR_SA_LEN
#undef HAVE_PSELECT
#define HAVE_BPF
/* 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_IPV6_PROC
#undef HAVE_RTNETLINK
#define HAVE_GETOPT_LONG
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#define HAVE_DEV_URANDOM
#define HAVE_DEV_RANDOM
#define HAVE_SOCKADDR_SA_LEN
#undef HAVE_PSELECT
#define HAVE_BPF
/* env "LIBS=-lsocket -lnsl" make */
#elif defined(__sun) || defined(__sun__)
#undef HAVE_LINUX_IPV6_PROC
#undef HAVE_RTNETLINK
#undef HAVE_GETOPT_LONG
#undef HAVE_ARC4RANDOM
#define HAVE_RANDOM
#undef HAVE_DEV_URANDOM
#undef HAVE_DEV_RANDOM
#undef HAVE_SOCKADDR_SA_LEN
#undef HAVE_PSELECT
#define HAVE_BPF
#endif
/* Decide if we're going to support 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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