release/src/router/dnsmasq/src/config.h

   1 /* dnsmasq is Copyright (c) 2000-2013 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, or
   6    (at your option) version 3 dated 29 June, 2007.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16
  17 #define FTABSIZ 150 /* max number of outstanding requests (default) */
  18 #define MAX_PROCS 20 /* max no children for TCP requests */
  19 #define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
  20 #define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
  21 #define KEYBLOCK_LEN 140 /* choose to mininise fragmentation when storing DNSSEC keys */
  22 #define TIMEOUT 10 /* drop UDP queries after TIMEOUT seconds */
  23 #define FORWARD_TEST 50 /* try all servers every 50 queries */
  24 #define FORWARD_TIME 20 /* or 20 seconds */
  25 #define RANDOM_SOCKS 64 /* max simultaneous random ports */
  26 #define LEASE_RETRY 60 /* on error, retry writing leasefile after LEASE_RETRY seconds */
  27 #define CACHESIZ 150 /* default cache size */
  28 #define MAXLEASES 1000 /* maximum number of DHCP leases */
  29 #define PING_WAIT 3 /* wait for ping address-in-use test */
  30 #define PING_CACHE_TIME 30 /* Ping test assumed to be valid this long. */
  31 #define DECLINE_BACKOFF 600 /* disable DECLINEd static addresses for this long */
  32 #define DHCP_PACKET_MAX 16384 /* hard limit on DHCP packet size */
  33 #define SMALLDNAME 40 /* most domain names are smaller than this */
  34 #define HOSTSFILE "/etc/hosts"
  35 #define ETHERSFILE "/etc/ethers"
  36 #define DEFLEASE 3600 /* default lease time, 1 hour */
  37 #define CHUSER "nobody"
  38 #define CHGRP "dip"
  39 #define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
  40 #define LOG_MAX 5 /* log-queue length */
  41 #define RANDFILE "/dev/urandom"
  42 #define EDNS0_OPTION_MAC 5 /* dyndns.org temporary assignment */
  43 #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq" /* Default - may be overridden by config */
  44 #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
  45 #define AUTH_TTL 600 /* default TTL for auth DNS */
  46 #define SOA_REFRESH 1200 /* SOA refresh default */
  47 #define SOA_RETRY 180 /* SOA retry default */
  48 #define SOA_EXPIRY 1209600 /* SOA expiry default */
  49 #define RA_INTERVAL 600 /* Send unsolicited RA's this often when not provoked. */
  50
  51 /* compile-time options: uncomment below to enable or do eg.
  52    make COPTS=-DHAVE_BROKEN_RTC
  53
  54 HAVE_BROKEN_RTC
  55    define this on embedded systems which don't have an RTC
  56    which keeps time over reboots. Causes dnsmasq to use uptime
  57    for timing, and keep lease lengths rather than expiry times
  58    in its leases file. This also make dnsmasq "flash disk friendly".
  59    Normally, dnsmasq tries very hard to keep the on-disk leases file
  60    up-to-date: rewriting it after every renewal.  When HAVE_BROKEN_RTC
  61    is in effect, the lease file is only written when a new lease is
  62    created, or an old one destroyed. (Because those are the only times
  63    it changes.) This vastly reduces the number of file writes, and makes
  64    it viable to keep the lease file on a flash filesystem.
  65    NOTE: when enabling or disabling this, be sure to delete any old
  66    leases file, otherwise dnsmasq may get very confused.
  67
  68 HAVE_TFTP
  69    define this to get dnsmasq's built-in TFTP server.
  70
  71 HAVE_DHCP
  72    define this to get dnsmasq's DHCPv4 server.
  73
  74 HAVE_DHCP6
  75    define this to get dnsmasq's DHCPv6 server. (implies HAVE_DHCP).
  76
  77 HAVE_SCRIPT
  78    define this to get the ability to call scripts on lease-change.
  79
  80 HAVE_LUASCRIPT
  81    define this to get the ability to call Lua script on lease-change. (implies HAVE_SCRIPT)
  82
  83 HAVE_DBUS
  84    define this if you want to link against libdbus, and have dnsmasq
  85    support some methods to allow (re)configuration of the upstream DNS
  86    servers via DBus.
  87
  88 HAVE_IDN
  89    define this if you want international domain name support.
  90    NOTE: for backwards compatibility, IDN support is automatically
  91          included when internationalisation support is built, using the
  92          *-i18n makefile targets, even if HAVE_IDN is not explicitly set.
  93
  94 HAVE_CONNTRACK
  95    define this to include code which propogates conntrack marks from
  96    incoming DNS queries to the corresponding upstream queries. This adds
  97    a build-dependency on libnetfilter_conntrack, but the resulting binary will
  98    still run happily on a kernel without conntrack support.
  99
 100 HAVE_IPSET
 101     define this to include the ability to selectively add resolved ip addresses
 102     to given ipsets.
 103
 104 HAVE_AUTH
 105    define this to include the facility to act as an authoritative DNS
 106    server for one or more zones.
 107
 108
 109 NO_IPV6
 110 NO_TFTP
 111 NO_DHCP
 112 NO_DHCP6
 113 NO_SCRIPT
 114 NO_LARGEFILE
 115 NO_AUTH
 116    these are avilable to explictly disable compile time options which would
 117    otherwise be enabled automatically (HAVE_IPV6, >2Gb file sizes) or
 118    which are enabled  by default in the distributed source tree. Building dnsmasq
 119    with something like "make COPTS=-DNO_SCRIPT" will do the trick.
 120
 121 LEASEFILE
 122 CONFFILE
 123 RESOLVFILE
 124    the default locations of these files are determined below, but may be overridden
 125    in a build command line using COPTS.
 126
 127 */
 128
 129
 130 /* The default set of options to build. Built with these options, dnsmasq
 131    has no library dependencies other than libc */
 132
 133 #define HAVE_DHCP
 134 #define HAVE_DHCP6
 135 #define HAVE_TFTP
 136 #define HAVE_SCRIPT
 137 #define HAVE_AUTH
 138 #define HAVE_IPSET
 139 /* #define HAVE_LUASCRIPT */
 140 /* #define HAVE_BROKEN_RTC */
 141 /* #define HAVE_DBUS */
 142 /* #define HAVE_IDN */
 143 /* #define HAVE_CONNTRACK */
 144
 145
 146 /* Default locations for important system files. */
 147
 148 #ifndef LEASEFILE
 149 #   if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
 150 #      define LEASEFILE "/var/db/dnsmasq.leases"
 151 #   elif defined(__sun__) || defined (__sun)
 152 #      define LEASEFILE "/var/cache/dnsmasq.leases"
 153 #   elif defined(__ANDROID__)
 154 #      define LEASEFILE "/data/misc/dhcp/dnsmasq.leases"
 155 #   else
 156 #      define LEASEFILE "/var/lib/misc/dnsmasq.leases"
 157 #   endif
 158 #endif
 159
 160 #ifndef CONFFILE
 161 #   if defined(__FreeBSD__)
 162 #      define CONFFILE "/usr/local/etc/dnsmasq.conf"
 163 #   else
 164 #      define CONFFILE "/etc/dnsmasq.conf"
 165 #   endif
 166 #endif
 167
 168 #ifndef RESOLVFILE
 169 #   if defined(__uClinux__)
 170 #      define RESOLVFILE "/etc/config/resolv.conf"
 171 #   else
 172 #      define RESOLVFILE "/etc/resolv.conf"
 173 #   endif
 174 #endif
 175
 176 #ifndef RUNFILE
 177 #   if defined(__ANDROID__)
 178 #      define RUNFILE "/data/dnsmasq.pid"
 179 #    else
 180 #      define RUNFILE "/var/run/dnsmasq.pid"
 181 #    endif
 182 #endif
 183
 184 /* platform dependent options: these are determined automatically below
 185
 186 HAVE_LINUX_NETWORK
 187 HAVE_BSD_NETWORK
 188 HAVE_SOLARIS_NETWORK
 189    define exactly one of these to alter interaction with kernel networking.
 190
 191 HAVE_GETOPT_LONG
 192    defined when GNU-style getopt_long available.
 193
 194 HAVE_ARC4RANDOM
 195    defined if arc4random() available to get better security from DNS spoofs
 196    by using really random ids (OpenBSD)
 197
 198 HAVE_SOCKADDR_SA_LEN
 199    defined if struct sockaddr has sa_len field (*BSD)
 200 */
 201
 202 /* Must preceed __linux__ since uClinux defines __linux__ too. */
 203 #if defined(__uClinux__)
 204 #define HAVE_LINUX_NETWORK
 205 #define HAVE_GETOPT_LONG
 206 #undef HAVE_ARC4RANDOM
 207 #undef HAVE_SOCKADDR_SA_LEN
 208 /* Never use fork() on uClinux. Note that this is subtly different from the
 209    --keep-in-foreground option, since it also  suppresses forking new
 210    processes for TCP connections and disables the call-a-script on leasechange
 211    system. It's intended for use on MMU-less kernels. */
 212 #define NO_FORK
 213
 214 #elif defined(__UCLIBC__)
 215 #define HAVE_LINUX_NETWORK
 216 #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
 217    ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
 218 #    define HAVE_GETOPT_LONG
 219 #endif
 220 #undef HAVE_ARC4RANDOM
 221 #undef HAVE_SOCKADDR_SA_LEN
 222 #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
 223 #  define NO_FORK
 224 #endif
 225 #if defined(__UCLIBC_HAS_IPV6__)
 226 #  ifndef IPV6_V6ONLY
 227 #    define IPV6_V6ONLY 26
 228 #  endif
 229 #endif
 230
 231 /* This is for glibc 2.x */
 232 #elif defined(__linux__)
 233 #define HAVE_LINUX_NETWORK
 234 #define HAVE_GETOPT_LONG
 235 #undef HAVE_ARC4RANDOM
 236 #undef HAVE_SOCKADDR_SA_LEN
 237
 238 #elif defined(__FreeBSD__) || \
 239       defined(__OpenBSD__) || \
 240       defined(__DragonFly__) || \
 241       defined(__FreeBSD_kernel__)
 242 #define HAVE_BSD_NETWORK
 243 /* Later verions of FreeBSD have getopt_long() */
 244 #if defined(optional_argument) && defined(required_argument)
 245 #   define HAVE_GETOPT_LONG
 246 #endif
 247 #if !defined(__FreeBSD_kernel__)
 248 #   define HAVE_ARC4RANDOM
 249 #endif
 250 #define HAVE_SOCKADDR_SA_LEN
 251
 252 #elif defined(__APPLE__)
 253 #define HAVE_BSD_NETWORK
 254 #define HAVE_GETOPT_LONG
 255 #define HAVE_ARC4RANDOM
 256 #define HAVE_SOCKADDR_SA_LEN
 257 /* Define before sys/socket.h is included so we get socklen_t */
 258 #define _BSD_SOCKLEN_T_
 259
 260 #elif defined(__NetBSD__)
 261 #define HAVE_BSD_NETWORK
 262 #define HAVE_GETOPT_LONG
 263 #undef HAVE_ARC4RANDOM
 264 #define HAVE_SOCKADDR_SA_LEN
 265
 266 #elif defined(__sun) || defined(__sun__)
 267 #define HAVE_SOLARIS_NETWORK
 268 #define HAVE_GETOPT_LONG
 269 #undef HAVE_ARC4RANDOM
 270 #undef HAVE_SOCKADDR_SA_LEN
 271 #define ETHER_ADDR_LEN 6
 272
 273 #endif
 274
 275 /* Decide if we're going to support IPv6 */
 276 /* We assume that systems which don't have IPv6
 277    headers don't have ntop and pton either */
 278
 279 #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY)
 280 #  define HAVE_IPV6
 281 #  define ADDRSTRLEN INET6_ADDRSTRLEN
 282 #elif defined(INET_ADDRSTRLEN)
 283 #  undef HAVE_IPV6
 284 #  define ADDRSTRLEN INET_ADDRSTRLEN
 285 #else
 286 #  undef HAVE_IPV6
 287 #  define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
 288 #endif
 289
 290
 291 /* rules to implement compile-time option dependencies and
 292    the NO_XXX flags */
 293
 294 #ifdef NO_IPV6
 295 #undef HAVE_IPV6
 296 #endif
 297
 298 #ifdef NO_TFTP
 299 #undef HAVE_TFTP
 300 #endif
 301
 302 #ifdef NO_DHCP
 303 #undef HAVE_DHCP
 304 #undef HAVE_DHCP6
 305 #endif
 306
 307 #if defined(NO_DHCP6) || !defined(HAVE_IPV6)
 308 #undef HAVE_DHCP6
 309 #endif
 310
 311 /* DHCP6 needs DHCP too */
 312 #ifdef HAVE_DHCP6
 313 #define HAVE_DHCP
 314 #endif
 315
 316 #if defined(NO_SCRIPT) || !defined(HAVE_DHCP) || defined(NO_FORK)
 317 #undef HAVE_SCRIPT
 318 #undef HAVE_LUASCRIPT
 319 #endif
 320
 321 /* Must HAVE_SCRIPT to HAVE_LUASCRIPT */
 322 #ifdef HAVE_LUASCRIPT
 323 #define HAVE_SCRIPT
 324 #endif
 325
 326 #ifdef NO_AUTH
 327 #undef HAVE_AUTH
 328 #endif
 329
 330 #if defined(NO_IPSET) || !defined(HAVE_LINUX_NETWORK)
 331 #undef HAVE_IPSET
 332 #endif
 333
 334 /* Define a string indicating which options are in use.
 335    DNSMASQP_COMPILE_OPTS is only defined in dnsmasq.c */
 336
 337 #ifdef DNSMASQ_COMPILE_OPTS
 338
 339 static char *compile_opts =
 340 #ifndef HAVE_IPV6
 341 "no-"
 342 #endif
 343 "IPv6 "
 344 #ifndef HAVE_GETOPT_LONG
 345 "no-"
 346 #endif
 347 "GNU-getopt "
 348 #ifdef HAVE_BROKEN_RTC
 349 "no-RTC "
 350 #endif
 351 #ifdef NO_FORK
 352 "no-MMU "
 353 #endif
 354 #ifndef HAVE_DBUS
 355 "no-"
 356 #endif
 357 "DBus "
 358 #ifndef LOCALEDIR
 359 "no-"
 360 #endif
 361 "i18n "
 362 #if !defined(LOCALEDIR) && !defined(HAVE_IDN)
 363 "no-"
 364 #endif
 365 "IDN "
 366 #ifndef HAVE_DHCP
 367 "no-"
 368 #endif
 369 "DHCP "
 370 #if defined(HAVE_DHCP)
 371 #  if !defined (HAVE_DHCP6)
 372      "no-"
 373 #  endif
 374      "DHCPv6 "
 375 #  if !defined(HAVE_SCRIPT)
 376      "no-scripts "
 377 #  else
 378 #    if !defined(HAVE_LUASCRIPT)
 379        "no-"
 380 #    endif
 381      "Lua "
 382 #  endif
 383 #endif
 384 #ifndef HAVE_TFTP
 385 "no-"
 386 #endif
 387 "TFTP "
 388 #ifndef HAVE_CONNTRACK
 389 "no-"
 390 #endif
 391 "conntrack "
 392 #ifndef HAVE_IPSET
 393 "no-"
 394 #endif
 395 "ipset "
 396 #ifdef HAVE_TOMATO
 397   "Tomato-helper "
 398 #endif
 399 #ifndef HAVE_AUTH
 400 "no-"
 401 #endif
 402   "auth";
 403
 404 #endif
 405
 406
 407