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+/* dnsmasq is Copyright (c) 2000-2009 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, or
+ (at your option) version 3 dated 29 June, 2007.
+
+ 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.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define VERSION "2.51"
+
+#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 FORWARD_TEST 50 /* try all servers every 50 queries */
+#define FORWARD_TIME 10 /* or 10 seconds */
+#define RANDOM_SOCKS 64 /* max simultaneous random ports */
+#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"
+
+#ifndef LEASEFILE
+# if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
+# define LEASEFILE "/var/db/dnsmasq.leases"
+# elif defined(__sun__) || defined (__sun)
+# define LEASEFILE "/var/cache/dnsmasq.leases"
+# else
+# define LEASEFILE "/var/lib/misc/dnsmasq.leases"
+# endif
+#endif
+
+#ifndef CONFFILE
+# if defined(__FreeBSD__)
+# define CONFFILE "/usr/local/etc/dnsmasq.conf"
+# else
+# define CONFFILE "/etc/dnsmasq.conf"
+# endif
+#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 DHCP_SERVER_ALTPORT 1067
+#define DHCP_CLIENT_ALTPORT 1068
+#define TFTP_PORT 69
+#define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
+#define LOG_MAX 5 /* log-queue length */
+#define RANDFILE "/dev/urandom"
+#define DAD_WAIT 20 /* retry binding IPv6 sockets for this long */
+
+/* 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
+
+
+/* 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
+HAVE_BSD_NETWORK
+HAVE_SOLARIS_NETWORK
+ define exactly one of these to alter interaction with kernel networking.
+
+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_TFTP
+ define this to get dnsmasq's built-in TFTP server.
+
+HAVE_DHCP
+ define this to get dnsmasq's DHCP server.
+
+HAVE_SCRIPT
+ define this to get the ability to call scripts on lease-change
+
+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_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
+ you should NOT define
+ HAVE_ARC4RANDOM
+ HAVE_SOCKADDR_SA_LEN
+
+ For *BSD systems you should define
+ HAVE_BSD_NETWORK
+ HAVE_SOCKADDR_SA_LEN
+ and you MAY define
+ HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later
+ HAVE_GETOPT_LONG - NetBSD, later FreeBSD
+ (FreeBSD and OpenBSD only if you link GNU getopt)
+
+*/
+
+/* platform independent options- uncomment to enable */
+#define HAVE_DHCP
+#define HAVE_TFTP
+#define HAVE_SCRIPT
+/* #define HAVE_BROKEN_RTC */
+/* #define HAVE_DBUS */
+
+/* Allow TFTP to be disabled with COPTS=-DNO_TFTP */
+#ifdef NO_TFTP
+#undef HAVE_TFTP
+#endif
+
+/* Allow DHCP to be disabled with COPTS=-DNO_DHCP */
+#ifdef NO_DHCP
+#undef HAVE_DHCP
+#endif
+
+/* Allow scripts to be disabled with COPTS=-DNO_SCRIPT */
+#ifdef NO_SCRIPT
+#undef HAVE_SCRIPT
+#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
+#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
+#endif
+#undef HAVE_ARC4RANDOM
+#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
+#undef HAVE_SOCKADDR_SA_LEN
+
+#elif defined(__FreeBSD__) || \
+ defined(__OpenBSD__) || \
+ defined(__DragonFly__) || \
+ defined (__FreeBSD_kernel__)
+#define HAVE_BSD_NETWORK
+/* Later verions of FreeBSD have getopt_long() */
+#if defined(optional_argument) && defined(required_argument)
+# define HAVE_GETOPT_LONG
+#endif
+#if !defined (__FreeBSD_kernel__)
+# define HAVE_ARC4RANDOM
+#endif
+#define HAVE_SOCKADDR_SA_LEN
+
+#elif defined(__APPLE__)
+#define HAVE_BSD_NETWORK
+#undef HAVE_GETOPT_LONG
+#define HAVE_ARC4RANDOM
+#define HAVE_SOCKADDR_SA_LEN
+/* Define before sys/socket.h is included so we get socklen_t */
+#define _BSD_SOCKLEN_T_
+
+#elif defined(__NetBSD__)
+#define HAVE_BSD_NETWORK
+#define HAVE_GETOPT_LONG
+#undef HAVE_ARC4RANDOM
+#define HAVE_SOCKADDR_SA_LEN
+
+#elif defined(__sun) || defined(__sun__)
+#define HAVE_SOLARIS_NETWORK
+#define HAVE_GETOPT_LONG
+#undef HAVE_ARC4RANDOM
+#undef HAVE_SOCKADDR_SA_LEN
+#define _XPG4_2
+#define __EXTENSIONS__
+#define ETHER_ADDR_LEN 6
+
+#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
+
+/* Can't do scripts without fork */
+#ifdef NOFORK
+# undef HAVE_SCRIPT
+#endif
+