src/config.h

   1 /* dnsmasq is Copyright (c) 2000-2007 Simon Kelley
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; version 2 dated June, 1991.
   6
   7    This program is distributed in the hope that it will be useful,
   8    but WITHOUT ANY WARRANTY; without even the implied warranty of
   9    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10    GNU General Public License for more details.
  11 */
  12
  13 #define VERSION "2.40"
  14
  15 #define FTABSIZ 150 /* max number of outstanding requests (default) */
  16 #define MAX_PROCS 20 /* max no children for TCP requests */
  17 #define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
  18 #define EDNS_PKTSZ 1280 /* default max EDNS.0 UDP packet from RFC2671 */
  19 #define TIMEOUT 10 /* drop UDP queries after TIMEOUT seconds */
  20 #define LEASE_RETRY 60 /* on error, retry writing leasefile after LEASE_RETRY seconds */
  21 #define CACHESIZ 150 /* default cache size */
  22 #define MAXLEASES 150 /* maximum number of DHCP leases */
  23 #define PING_WAIT 3 /* wait for ping address-in-use test */
  24 #define PING_CACHE_TIME 30 /* Ping test assumed to be valid this long. */
  25 #define DECLINE_BACKOFF 600 /* disable DECLINEd static addresses for this long */
  26 #define DHCP_PACKET_MAX 16384 /* hard limit on DHCP packet size */
  27 #define SMALLDNAME 40 /* most domain names are smaller than this */
  28 #define HOSTSFILE "/etc/hosts"
  29 #define ETHERSFILE "/etc/ethers"
  30 #ifdef __uClinux__
  31 #  define RESOLVFILE "/etc/config/resolv.conf"
  32 #else
  33 #  define RESOLVFILE "/etc/resolv.conf"
  34 #endif
  35 #define RUNFILE "/var/run/dnsmasq.pid"
  36 #if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__)
  37 #   define LEASEFILE "/var/db/dnsmasq.leases"
  38 #else
  39 #   define LEASEFILE "/var/lib/misc/dnsmasq.leases"
  40 #endif
  41 #if defined(__FreeBSD__)
  42 #   define CONFFILE "/usr/local/etc/dnsmasq.conf"
  43 #else
  44 #   define CONFFILE "/etc/dnsmasq.conf"
  45 #endif
  46 #define DEFLEASE 3600 /* default lease time, 1 hour */
  47 #define CHUSER "nobody"
  48 #define CHGRP "dip"
  49 #define DHCP_SERVER_PORT 67
  50 #define DHCP_CLIENT_PORT 68
  51 #define TFTP_PORT 69
  52 #define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
  53 #define LOG_MAX 5 /* log-queue length */
  54
  55 /* DBUS interface specifics */
  56 #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq"
  57 #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
  58
  59 /* A small collection of RR-types which are missing on some platforms */
  60
  61 #ifndef T_SIG
  62 #  define T_SIG 24
  63 #endif
  64
  65 #ifndef T_SRV
  66 #  define T_SRV 33
  67 #endif
  68
  69 #ifndef T_OPT
  70 #  define T_OPT 41
  71 #endif
  72
  73 #ifndef T_TKEY
  74 #  define T_TKEY 249
  75 #endif
  76
  77 #ifndef T_TSIG
  78 #  define T_TSIG 250
  79 #endif
  80
  81
  82 /* Get linux C library versions. */
  83 #if defined(__linux__) && !defined(__UCLIBC__) && !defined(__uClinux__)
  84 /*#  include <libio.h> */
  85 #  include <features.h>
  86 #endif
  87
  88
  89 /* Follows system specific switches. If you run on a
  90    new system, you may want to edit these.
  91    May replace this with Autoconf one day.
  92
  93 HAVE_LINUX_NETWORK
  94    define this to do networking the Linux way. When it's defined, the code will
  95    use IP_PKTINFO, Linux capabilities and the RTnetlink system. If it's not defined,
  96    a few facilities will be lost, namely support for multiple addresses on an interface,
  97    DNS query retransmission, and (on some systems) wildcard interface binding.
  98
  99 HAVE_BROKEN_RTC
 100    define this on embedded systems which don't have an RTC
 101    which keeps time over reboots. Causes dnsmasq to use uptime
 102    for timing, and keep lease lengths rather than expiry times
 103    in its leases file. This also make dnsmasq "flash disk friendly".
 104    Normally, dnsmasq tries very hard to keep the on-disk leases file
 105    up-to-date: rewriting it after every renewal.  When HAVE_BROKEN_RTC
 106    is in effect, the lease file is only written when a new lease is
 107    created, or an old one destroyed. (Because those are the only times
 108    it changes.) This vastly reduces the number of file writes, and makes
 109    it viable to keep the lease file on a flash filesystem.
 110    NOTE: when enabling or disabling this, be sure to delete any old
 111    leases file, otherwise dnsmasq may get very confused.
 112
 113 HAVE_ISC_READER
 114    define this to include the old ISC dhcpcd integration. Note that you cannot
 115    set both HAVE_ISC_READER and HAVE_BROKEN_RTC.
 116
 117 HAVE_TFTP
 118    define this to get dnsmasq's built-in TFTP server.
 119
 120 HAVE_GETOPT_LONG
 121    define this if you have GNU libc or GNU getopt.
 122
 123 HAVE_ARC4RANDOM
 124    define this if you have arc4random() to get better security from DNS spoofs
 125    by using really random ids (OpenBSD)
 126
 127 HAVE_RANDOM
 128    define this if you have the 4.2BSD random() function (and its
 129    associated srandom() function), which is at least as good as (if not
 130    better than) the rand() function.
 131
 132 HAVE_DEV_RANDOM
 133    define this if you have the /dev/random device, which gives truly
 134    random numbers but may run out of random numbers.
 135
 136 HAVE_DEV_URANDOM
 137    define this if you have the /dev/urandom device, which gives
 138    semi-random numbers when it runs out of truly random numbers.
 139
 140 HAVE_SOCKADDR_SA_LEN
 141    define this if struct sockaddr has sa_len field (*BSD)
 142
 143 HAVE_DBUS
 144    Define this if you want to link against libdbus, and have dnsmasq
 145    define some methods to allow (re)configuration of the upstream DNS
 146    servers via DBus.
 147
 148 NOTES:
 149    For Linux you should define
 150       HAVE_LINUX_NETWORK
 151       HAVE_GETOPT_LONG
 152       HAVE_RANDOM
 153       HAVE_DEV_RANDOM
 154       HAVE_DEV_URANDOM
 155   you should NOT define
 156       HAVE_ARC4RANDOM
 157       HAVE_SOCKADDR_SA_LEN
 158
 159    For *BSD systems you should define
 160      HAVE_SOCKADDR_SA_LEN
 161      HAVE_RANDOM
 162    you should NOT define
 163      HAVE_LINUX_NETWORK
 164    and you MAY define
 165      HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later
 166      HAVE_DEV_URANDOM - OpenBSD and FreeBSD and NetBSD
 167      HAVE_DEV_RANDOM - FreeBSD  and NetBSD
 168                        (OpenBSD with hardware random number generator)
 169      HAVE_GETOPT_LONG - NetBSD, later FreeBSD
 170                        (FreeBSD and OpenBSD only if you link GNU getopt)
 171
 172 */
 173
 174 /* platform independent options- uncomment to enable */
 175 #define HAVE_TFTP
 176 /* #define HAVE_BROKEN_RTC */
 177 /* #define HAVE_ISC_READER */
 178 /* #define HAVE_DBUS */
 179
 180 #if defined(HAVE_BROKEN_RTC) && defined(HAVE_ISC_READER)
 181 #  error HAVE_ISC_READER is not compatible with HAVE_BROKEN_RTC
 182 #endif
 183
 184 /* Allow TFTP to be disabled with COPT=-DNO_TFTP */
 185 #ifdef NO_TFTP
 186 #undef HAVE_TFTP
 187 #endif
 188
 189 /* platform dependent options. */
 190
 191 /* Must preceed __linux__ since uClinux defines __linux__ too. */
 192 #if defined(__uClinux__)
 193 #define HAVE_LINUX_NETWORK
 194 #define HAVE_GETOPT_LONG
 195 #undef HAVE_ARC4RANDOM
 196 #define HAVE_RANDOM
 197 #define HAVE_DEV_URANDOM
 198 #define HAVE_DEV_RANDOM
 199 #undef HAVE_SOCKADDR_SA_LEN
 200 /* Never use fork() on uClinux. Note that this is subtly different from the
 201    --keep-in-foreground option, since it also  suppresses forking new
 202    processes for TCP connections and disables the call-a-script on leasechange
 203    system. It's intended for use on MMU-less kernels. */
 204 #define NO_FORK
 205
 206 #elif defined(__UCLIBC__)
 207 #define HAVE_LINUX_NETWORK
 208 #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
 209    ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
 210 #    define HAVE_GETOPT_LONG
 211 #else
 212 #    undef HAVE_GETOPT_LONG
 213 #endif
 214 #undef HAVE_ARC4RANDOM
 215 #define HAVE_RANDOM
 216 #define HAVE_DEV_URANDOM
 217 #define HAVE_DEV_RANDOM
 218 #undef HAVE_SOCKADDR_SA_LEN
 219 #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
 220 #  define NO_FORK
 221 #endif
 222 #if defined(__UCLIBC_HAS_IPV6__)
 223 #  ifndef IPV6_V6ONLY
 224 #    define IPV6_V6ONLY 26
 225 #  endif
 226 #endif
 227
 228 /* This is for glibc 2.x */
 229 #elif defined(__linux__)
 230 #define HAVE_LINUX_NETWORK
 231 #define HAVE_GETOPT_LONG
 232 #undef HAVE_ARC4RANDOM
 233 #define HAVE_RANDOM
 234 #define HAVE_DEV_URANDOM
 235 #define HAVE_DEV_RANDOM
 236 #undef HAVE_SOCKADDR_SA_LEN
 237 /* glibc < 2.2  has broken Sockaddr_in6 so we have to use our own. */
 238 /* glibc < 2.2 doesn't define in_addr_t */
 239 #if defined(__GLIBC__) && (__GLIBC__ == 2) && \
 240     defined(__GLIBC_MINOR__) && (__GLIBC_MINOR__ < 2)
 241 typedef unsigned long in_addr_t;
 242 #   define HAVE_BROKEN_SOCKADDR_IN6
 243 #endif
 244
 245 #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
 246 #undef HAVE_LINUX_NETWORK
 247 /* Later verions of FreeBSD have getopt_long() */
 248 #if defined(optional_argument) && defined(required_argument)
 249 #   define HAVE_GETOPT_LONG
 250 #else
 251 #   undef HAVE_GETOPT_LONG
 252 #endif
 253 #define HAVE_ARC4RANDOM
 254 #define HAVE_RANDOM
 255 #define HAVE_DEV_URANDOM
 256 #define HAVE_SOCKADDR_SA_LEN
 257
 258 #elif defined(__APPLE__)
 259 #undef HAVE_LINUX_NETWORK
 260 #undef HAVE_GETOPT_LONG
 261 #define HAVE_ARC4RANDOM
 262 #define HAVE_RANDOM
 263 #define HAVE_DEV_URANDOM
 264 #define HAVE_SOCKADDR_SA_LEN
 265 /* Define before sys/socket.h is included so we get socklen_t */
 266 #define _BSD_SOCKLEN_T_
 267 /* This is not defined in Mac OS X arpa/nameserv.h */
 268 #define IN6ADDRSZ 16
 269
 270 #elif defined(__NetBSD__)
 271 #undef HAVE_LINUX_NETWORK
 272 #define HAVE_GETOPT_LONG
 273 #undef HAVE_ARC4RANDOM
 274 #define HAVE_RANDOM
 275 #define HAVE_DEV_URANDOM
 276 #define HAVE_DEV_RANDOM
 277 #define HAVE_SOCKADDR_SA_LEN
 278
 279 #endif
 280 /* Decide if we're going to support IPv6 */
 281 /* IPv6 can be forced off with "make COPTS=-DNO_IPV6" */
 282 /* We assume that systems which don't have IPv6
 283    headers don't have ntop and pton either */
 284
 285 #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6)
 286 #  define HAVE_IPV6
 287 #  define ADDRSTRLEN INET6_ADDRSTRLEN
 288 #  if defined(SOL_IPV6)
 289 #    define IPV6_LEVEL SOL_IPV6
 290 #  else
 291 #    define IPV6_LEVEL IPPROTO_IPV6
 292 #  endif
 293 #elif defined(INET_ADDRSTRLEN)
 294 #  undef HAVE_IPV6
 295 #  define ADDRSTRLEN INET_ADDRSTRLEN
 296 #else
 297 #  undef HAVE_IPV6
 298 #  define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
 299 #endif
 300