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

   1 /* dnsmasq is Copyright (c) 2000-2016 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 TCP_MAX_QUERIES 100 /* Maximum number of queries per incoming TCP connection */
  21 #define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
  22 #define SAFE_PKTSZ 1280 /* "go anywhere" UDP packet size */
  23 #define KEYBLOCK_LEN 40 /* choose to mininise fragmentation when storing DNSSEC keys */
  24 #define DNSSEC_WORK 50 /* Max number of queries to validate one question */
  25 #define TIMEOUT 10 /* drop UDP queries after TIMEOUT seconds */
  26 #define FORWARD_TEST 50 /* try all servers every 50 queries */
  27 #define FORWARD_TIME 20 /* or 20 seconds */
  28 #define SERVERS_LOGGED 30 /* Only log this many servers when logging state */
  29 #define RANDOM_SOCKS 64 /* max simultaneous random ports */
  30 #define LEASE_RETRY 60 /* on error, retry writing leasefile after LEASE_RETRY seconds */
  31 #define CACHESIZ 150 /* default cache size */
  32 #define TTL_FLOOR_LIMIT 3600 /* don't allow --min-cache-ttl to raise TTL above this under any circumstances */
  33 #define MAXLEASES 1000 /* maximum number of DHCP leases */
  34 #define PING_WAIT 3 /* wait for ping address-in-use test */
  35 #define PING_CACHE_TIME 30 /* Ping test assumed to be valid this long. */
  36 #define DECLINE_BACKOFF 600 /* disable DECLINEd static addresses for this long */
  37 #define DHCP_PACKET_MAX 16384 /* hard limit on DHCP packet size */
  38 #define SMALLDNAME 50 /* most domain names are smaller than this */
  39 #define CNAME_CHAIN 10 /* chains longer than this atr dropped for loop protection */
  40 #define HOSTSFILE "/etc/hosts"
  41 #define ETHERSFILE "/etc/ethers"
  42 #define DEFLEASE 3600 /* default lease time, 1 hour */
  43 #define CHUSER "nobody"
  44 #define CHGRP "dip"
  45 #define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
  46 #define LOG_MAX 5 /* log-queue length */
  47 #define RANDFILE "/dev/urandom"
  48 #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq" /* Default - may be overridden by config */
  49 #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
  50 #define AUTH_TTL 600 /* default TTL for auth DNS */
  51 #define SOA_REFRESH 1200 /* SOA refresh default */
  52 #define SOA_RETRY 180 /* SOA retry default */
  53 #define SOA_EXPIRY 1209600 /* SOA expiry default */
  54 #define LOOP_TEST_DOMAIN "test" /* domain for loop testing, "test" is reserved by RFC 2606 and won't therefore clash */
  55 #define LOOP_TEST_TYPE T_TXT
  56
  57 /* compile-time options: uncomment below to enable or do eg.
  58    make COPTS=-DHAVE_BROKEN_RTC
  59
  60 HAVE_BROKEN_RTC
  61    define this on embedded systems which don't have an RTC
  62    which keeps time over reboots. Causes dnsmasq to use uptime
  63    for timing, and keep lease lengths rather than expiry times
  64    in its leases file. This also make dnsmasq "flash disk friendly".
  65    Normally, dnsmasq tries very hard to keep the on-disk leases file
  66    up-to-date: rewriting it after every renewal.  When HAVE_BROKEN_RTC
  67    is in effect, the lease file is only written when a new lease is
  68    created, or an old one destroyed. (Because those are the only times
  69    it changes.) This vastly reduces the number of file writes, and makes
  70    it viable to keep the lease file on a flash filesystem.
  71    NOTE: when enabling or disabling this, be sure to delete any old
  72    leases file, otherwise dnsmasq may get very confused.
  73
  74 HAVE_LEASEFILE_EXPIRE
  75
  76 HAVE_TOMATO
  77
  78 HAVE_TFTP
  79    define this to get dnsmasq's built-in TFTP server.
  80
  81 HAVE_DHCP
  82    define this to get dnsmasq's DHCPv4 server.
  83
  84 HAVE_DHCP6
  85    define this to get dnsmasq's DHCPv6 server. (implies HAVE_DHCP).
  86
  87 HAVE_SCRIPT
  88    define this to get the ability to call scripts on lease-change.
  89
  90 HAVE_LUASCRIPT
  91    define this to get the ability to call Lua script on lease-change. (implies HAVE_SCRIPT)
  92
  93 HAVE_DBUS
  94    define this if you want to link against libdbus, and have dnsmasq
  95    support some methods to allow (re)configuration of the upstream DNS
  96    servers via DBus.
  97
  98 HAVE_IDN
  99    define this if you want international domain name support.
 100    NOTE: for backwards compatibility, IDN support is automatically
 101          included when internationalisation support is built, using the
 102          *-i18n makefile targets, even if HAVE_IDN is not explicitly set.
 103
 104 HAVE_CONNTRACK
 105    define this to include code which propogates conntrack marks from
 106    incoming DNS queries to the corresponding upstream queries. This adds
 107    a build-dependency on libnetfilter_conntrack, but the resulting binary will
 108    still run happily on a kernel without conntrack support.
 109
 110 HAVE_IPSET
 111     define this to include the ability to selectively add resolved ip addresses
 112     to given ipsets.
 113
 114 HAVE_AUTH
 115    define this to include the facility to act as an authoritative DNS
 116    server for one or more zones.
 117
 118 HAVE_DNSSEC
 119    include DNSSEC validator.
 120
 121 HAVE_LOOP
 122    include functionality to probe for and remove DNS forwarding loops.
 123
 124 HAVE_INOTIFY
 125    use the Linux inotify facility to efficiently re-read configuration files.
 126
 127 NO_IPV6
 128 NO_TFTP
 129 NO_DHCP
 130 NO_DHCP6
 131 NO_SCRIPT
 132 NO_LARGEFILE
 133 NO_AUTH
 134 NO_INOTIFY
 135    these are avilable to explictly disable compile time options which would
 136    otherwise be enabled automatically (HAVE_IPV6, >2Gb file sizes) or
 137    which are enabled  by default in the distributed source tree. Building dnsmasq
 138    with something like "make COPTS=-DNO_SCRIPT" will do the trick.
 139
 140 NO_NETTLE_ECC
 141    Don't include the ECDSA cypher in DNSSEC validation. Needed for older Nettle versions.
 142 NO_GMP
 143    Don't use and link against libgmp, Useful if nettle is built with --enable-mini-gmp.
 144
 145 LEASEFILE
 146 CONFFILE
 147 RESOLVFILE
 148    the default locations of these files are determined below, but may be overridden
 149    in a build command line using COPTS.
 150
 151 */
 152
 153 /* Defining this builds a binary which handles time differently and works better on a system without a
 154    stable RTC (it uses uptime, not epoch time) and writes the DHCP leases file less often to avoid flash wear.
 155 */
 156
 157 /* #define HAVE_BROKEN_RTC */
 158
 159 /* The default set of options to build. Built with these options, dnsmasq
 160    has no library dependencies other than libc */
 161
 162 #define HAVE_DHCP
 163 #define HAVE_DHCP6
 164 #define HAVE_TFTP
 165 #define HAVE_SCRIPT
 166 #define HAVE_AUTH
 167 #define HAVE_IPSET
 168 #define HAVE_LOOP
 169
 170 /* Build options which require external libraries.
 171
 172    Defining HAVE_<opt>_STATIC as _well_ as HAVE_<opt> will link the library statically.
 173
 174    You can use "make COPTS=-DHAVE_<opt>" instead of editing these.
 175 */
 176
 177 /* #define HAVE_LUASCRIPT */
 178 /* #define HAVE_DBUS */
 179 /* #define HAVE_IDN */
 180 /* #define HAVE_CONNTRACK */
 181 /* #define HAVE_DNSSEC */
 182
 183
 184 /* Default locations for important system files. */
 185
 186 #ifndef LEASEFILE
 187 #   if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
 188 #      define LEASEFILE "/var/db/dnsmasq.leases"
 189 #   elif defined(__sun__) || defined (__sun)
 190 #      define LEASEFILE "/var/cache/dnsmasq.leases"
 191 #   elif defined(__ANDROID__)
 192 #      define LEASEFILE "/data/misc/dhcp/dnsmasq.leases"
 193 #   else
 194 #      define LEASEFILE "/var/lib/misc/dnsmasq.leases"
 195 #   endif
 196 #endif
 197
 198 #ifndef CONFFILE
 199 #   if defined(__FreeBSD__)
 200 #      define CONFFILE "/usr/local/etc/dnsmasq.conf"
 201 #   else
 202 #      define CONFFILE "/etc/dnsmasq.conf"
 203 #   endif
 204 #endif
 205
 206 #ifndef RESOLVFILE
 207 #   if defined(__uClinux__)
 208 #      define RESOLVFILE "/etc/config/resolv.conf"
 209 #   else
 210 #      define RESOLVFILE "/etc/resolv.conf"
 211 #   endif
 212 #endif
 213
 214 #ifndef RUNFILE
 215 #   if defined(__ANDROID__)
 216 #      define RUNFILE "/data/dnsmasq.pid"
 217 #    else
 218 #      define RUNFILE "/var/run/dnsmasq.pid"
 219 #    endif
 220 #endif
 221
 222 /* platform dependent options: these are determined automatically below
 223
 224 HAVE_LINUX_NETWORK
 225 HAVE_BSD_NETWORK
 226 HAVE_SOLARIS_NETWORK
 227    define exactly one of these to alter interaction with kernel networking.
 228
 229 HAVE_GETOPT_LONG
 230    defined when GNU-style getopt_long available.
 231
 232 HAVE_SOCKADDR_SA_LEN
 233    defined if struct sockaddr has sa_len field (*BSD)
 234 */
 235
 236 /* Must preceed __linux__ since uClinux defines __linux__ too. */
 237 #if defined(__uClinux__)
 238 #define HAVE_LINUX_NETWORK
 239 #define HAVE_GETOPT_LONG
 240 #undef HAVE_SOCKADDR_SA_LEN
 241 /* Never use fork() on uClinux. Note that this is subtly different from the
 242    --keep-in-foreground option, since it also  suppresses forking new
 243    processes for TCP connections and disables the call-a-script on leasechange
 244    system. It's intended for use on MMU-less kernels. */
 245 #define NO_FORK
 246
 247 #elif defined(__UCLIBC__)
 248 #define HAVE_LINUX_NETWORK
 249 #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
 250    ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
 251 #    define HAVE_GETOPT_LONG
 252 #endif
 253 #undef HAVE_SOCKADDR_SA_LEN
 254 #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
 255 #  define NO_FORK
 256 #endif
 257 #if defined(__UCLIBC_HAS_IPV6__)
 258 #  ifndef IPV6_V6ONLY
 259 #    define IPV6_V6ONLY 26
 260 #  endif
 261 #endif
 262
 263 /* This is for glibc 2.x */
 264 #elif defined(__linux__)
 265 #define HAVE_LINUX_NETWORK
 266 #define HAVE_GETOPT_LONG
 267 #undef HAVE_SOCKADDR_SA_LEN
 268
 269 #elif defined(__FreeBSD__) || \
 270       defined(__OpenBSD__) || \
 271       defined(__DragonFly__) || \
 272       defined(__FreeBSD_kernel__)
 273 #define HAVE_BSD_NETWORK
 274 /* Later verions of FreeBSD have getopt_long() */
 275 #if defined(optional_argument) && defined(required_argument)
 276 #   define HAVE_GETOPT_LONG
 277 #endif
 278 #define HAVE_SOCKADDR_SA_LEN
 279
 280 #elif defined(__APPLE__)
 281 #define HAVE_BSD_NETWORK
 282 #define HAVE_GETOPT_LONG
 283 #define HAVE_SOCKADDR_SA_LEN
 284 /* Define before sys/socket.h is included so we get socklen_t */
 285 #define _BSD_SOCKLEN_T_
 286 /* Select the RFC_3542 version of the IPv6 socket API.
 287    Define before netinet6/in6.h is included. */
 288 #define __APPLE_USE_RFC_3542
 289 #define NO_IPSET
 290
 291 #elif defined(__NetBSD__)
 292 #define HAVE_BSD_NETWORK
 293 #define HAVE_GETOPT_LONG
 294 #define HAVE_SOCKADDR_SA_LEN
 295
 296 #elif defined(__sun) || defined(__sun__)
 297 #define HAVE_SOLARIS_NETWORK
 298 #define HAVE_GETOPT_LONG
 299 #undef HAVE_SOCKADDR_SA_LEN
 300 #define ETHER_ADDR_LEN 6
 301
 302 #endif
 303
 304 /* Decide if we're going to support IPv6 */
 305 /* We assume that systems which don't have IPv6
 306    headers don't have ntop and pton either */
 307
 308 #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY)
 309 #  define HAVE_IPV6
 310 #  define ADDRSTRLEN INET6_ADDRSTRLEN
 311 #else
 312 #  if !defined(INET_ADDRSTRLEN)
 313 #      define INET_ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
 314 #  endif
 315 #  undef HAVE_IPV6
 316 #  define ADDRSTRLEN INET_ADDRSTRLEN
 317 #endif
 318
 319
 320 /* rules to implement compile-time option dependencies and
 321    the NO_XXX flags */
 322
 323 #ifdef NO_IPV6
 324 #undef HAVE_IPV6
 325 #endif
 326
 327 #ifdef NO_TFTP
 328 #undef HAVE_TFTP
 329 #endif
 330
 331 #ifdef NO_DHCP
 332 #undef HAVE_DHCP
 333 #undef HAVE_DHCP6
 334 #endif
 335
 336 #if defined(NO_DHCP6) || !defined(HAVE_IPV6)
 337 #undef HAVE_DHCP6
 338 #endif
 339
 340 /* DHCP6 needs DHCP too */
 341 #ifdef HAVE_DHCP6
 342 #define HAVE_DHCP
 343 #endif
 344
 345 #if defined(NO_SCRIPT) || defined(NO_FORK)
 346 #undef HAVE_SCRIPT
 347 #undef HAVE_LUASCRIPT
 348 #endif
 349
 350 /* Must HAVE_SCRIPT to HAVE_LUASCRIPT */
 351 #ifdef HAVE_LUASCRIPT
 352 #define HAVE_SCRIPT
 353 #endif
 354
 355 #ifdef NO_AUTH
 356 #undef HAVE_AUTH
 357 #endif
 358
 359 #if defined(NO_IPSET)
 360 #undef HAVE_IPSET
 361 #endif
 362
 363 #ifdef NO_LOOP
 364 #undef HAVE_LOOP
 365 #endif
 366
 367 #ifdef HAVE_TOMATO
 368 #define HAVE_LEASEFILE_EXPIRE
 369 #endif
 370
 371 #if defined (HAVE_LINUX_NETWORK) && !defined(NO_INOTIFY)
 372 #define HAVE_INOTIFY
 373 #endif
 374
 375 /* Define a string indicating which options are in use.
 376    DNSMASQP_COMPILE_OPTS is only defined in dnsmasq.c */
 377
 378 #ifdef DNSMASQ_COMPILE_OPTS
 379
 380 static char *compile_opts =
 381 #ifndef HAVE_IPV6
 382 "no-"
 383 #endif
 384 "IPv6 "
 385 #ifndef HAVE_GETOPT_LONG
 386 "no-"
 387 #endif
 388 "GNU-getopt "
 389 #ifdef HAVE_BROKEN_RTC
 390 "no-RTC "
 391 #endif
 392 #ifdef NO_FORK
 393 "no-MMU "
 394 #endif
 395 #ifndef HAVE_DBUS
 396 "no-"
 397 #endif
 398 "DBus "
 399 #ifndef LOCALEDIR
 400 "no-"
 401 #endif
 402 "i18n "
 403 #if !defined(LOCALEDIR) && !defined(HAVE_IDN)
 404 "no-"
 405 #endif
 406 "IDN "
 407 #ifndef HAVE_DHCP
 408 "no-"
 409 #endif
 410 "DHCP "
 411 #if defined(HAVE_DHCP)
 412 #  if !defined (HAVE_DHCP6)
 413      "no-"
 414 #  endif
 415      "DHCPv6 "
 416 #  if !defined(HAVE_SCRIPT)
 417      "no-scripts "
 418 #  else
 419 #    if !defined(HAVE_LUASCRIPT)
 420        "no-"
 421 #    endif
 422      "Lua "
 423 #  endif
 424 #endif
 425 #ifndef HAVE_TFTP
 426 "no-"
 427 #endif
 428 "TFTP "
 429 #ifndef HAVE_CONNTRACK
 430 "no-"
 431 #endif
 432 "conntrack "
 433 #ifndef HAVE_IPSET
 434 "no-"
 435 #endif
 436 "ipset "
 437 #ifdef HAVE_TOMATO
 438   "Tomato-helper "
 439 #endif
 440 #ifndef HAVE_AUTH
 441 "no-"
 442 #endif
 443 "auth "
 444 #ifndef HAVE_DNSSEC
 445 "no-"
 446 #endif
 447 "DNSSEC "
 448 #ifndef HAVE_LOOP
 449 "no-"
 450 #endif
 451 "loop-detect "
 452 #ifndef HAVE_INOTIFY
 453 "no-"
 454 #endif
 455 "inotify";
 456
 457 #endif
 458
 459
 460