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 DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq" /* Default - may be overridden by config */
  43 #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
  44 #define AUTH_TTL 600 /* default TTL for auth DNS */
  45 #define SOA_REFRESH 1200 /* SOA refresh default */
  46 #define SOA_RETRY 180 /* SOA retry default */
  47 #define SOA_EXPIRY 1209600 /* SOA expiry default */
  48
  49 /* compile-time options: uncomment below to enable or do eg.
  50    make COPTS=-DHAVE_BROKEN_RTC
  51
  52 HAVE_BROKEN_RTC
  53    define this on embedded systems which don't have an RTC
  54    which keeps time over reboots. Causes dnsmasq to use uptime
  55    for timing, and keep lease lengths rather than expiry times
  56    in its leases file. This also make dnsmasq "flash disk friendly".
  57    Normally, dnsmasq tries very hard to keep the on-disk leases file
  58    up-to-date: rewriting it after every renewal.  When HAVE_BROKEN_RTC
  59    is in effect, the lease file is only written when a new lease is
  60    created, or an old one destroyed. (Because those are the only times
  61    it changes.) This vastly reduces the number of file writes, and makes
  62    it viable to keep the lease file on a flash filesystem.
  63    NOTE: when enabling or disabling this, be sure to delete any old
  64    leases file, otherwise dnsmasq may get very confused.
  65
  66 HAVE_LEASEFILE_EXPIRE
  67
  68 HAVE_TOMATO
  69
  70 HAVE_TFTP
  71    define this to get dnsmasq's built-in TFTP server.
  72
  73 HAVE_DHCP
  74    define this to get dnsmasq's DHCPv4 server.
  75
  76 HAVE_DHCP6
  77    define this to get dnsmasq's DHCPv6 server. (implies HAVE_DHCP).
  78
  79 HAVE_SCRIPT
  80    define this to get the ability to call scripts on lease-change.
  81
  82 HAVE_LUASCRIPT
  83    define this to get the ability to call Lua script on lease-change. (implies HAVE_SCRIPT)
  84
  85 HAVE_DBUS
  86    define this if you want to link against libdbus, and have dnsmasq
  87    support some methods to allow (re)configuration of the upstream DNS
  88    servers via DBus.
  89
  90 HAVE_IDN
  91    define this if you want international domain name support.
  92    NOTE: for backwards compatibility, IDN support is automatically
  93          included when internationalisation support is built, using the
  94          *-i18n makefile targets, even if HAVE_IDN is not explicitly set.
  95
  96 HAVE_CONNTRACK
  97    define this to include code which propogates conntrack marks from
  98    incoming DNS queries to the corresponding upstream queries. This adds
  99    a build-dependency on libnetfilter_conntrack, but the resulting binary will
 100    still run happily on a kernel without conntrack support.
 101
 102 HAVE_IPSET
 103     define this to include the ability to selectively add resolved ip addresses
 104     to given ipsets.
 105
 106 HAVE_AUTH
 107    define this to include the facility to act as an authoritative DNS
 108    server for one or more zones.
 109
 110
 111 NO_IPV6
 112 NO_TFTP
 113 NO_DHCP
 114 NO_DHCP6
 115 NO_SCRIPT
 116 NO_LARGEFILE
 117 NO_AUTH
 118    these are avilable to explictly disable compile time options which would
 119    otherwise be enabled automatically (HAVE_IPV6, >2Gb file sizes) or
 120    which are enabled  by default in the distributed source tree. Building dnsmasq
 121    with something like "make COPTS=-DNO_SCRIPT" will do the trick.
 122
 123 LEASEFILE
 124 CONFFILE
 125 RESOLVFILE
 126    the default locations of these files are determined below, but may be overridden
 127    in a build command line using COPTS.
 128
 129 */
 130
 131
 132 /* The default set of options to build. Built with these options, dnsmasq
 133    has no library dependencies other than libc */
 134
 135 #define HAVE_DHCP
 136 #define HAVE_DHCP6
 137 #define HAVE_TFTP
 138 #define HAVE_SCRIPT
 139 #define HAVE_AUTH
 140 #define HAVE_IPSET
 141 /* #define HAVE_LUASCRIPT */
 142 /* #define HAVE_BROKEN_RTC */
 143 /* #define HAVE_DBUS */
 144 /* #define HAVE_IDN */
 145 /* #define HAVE_CONNTRACK */
 146
 147
 148 /* Default locations for important system files. */
 149
 150 #ifndef LEASEFILE
 151 #   if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
 152 #      define LEASEFILE "/var/db/dnsmasq.leases"
 153 #   elif defined(__sun__) || defined (__sun)
 154 #      define LEASEFILE "/var/cache/dnsmasq.leases"
 155 #   elif defined(__ANDROID__)
 156 #      define LEASEFILE "/data/misc/dhcp/dnsmasq.leases"
 157 #   else
 158 #      define LEASEFILE "/var/lib/misc/dnsmasq.leases"
 159 #   endif
 160 #endif
 161
 162 #ifndef CONFFILE
 163 #   if defined(__FreeBSD__)
 164 #      define CONFFILE "/usr/local/etc/dnsmasq.conf"
 165 #   else
 166 #      define CONFFILE "/etc/dnsmasq.conf"
 167 #   endif
 168 #endif
 169
 170 #ifndef RESOLVFILE
 171 #   if defined(__uClinux__)
 172 #      define RESOLVFILE "/etc/config/resolv.conf"
 173 #   else
 174 #      define RESOLVFILE "/etc/resolv.conf"
 175 #   endif
 176 #endif
 177
 178 #ifndef RUNFILE
 179 #   if defined(__ANDROID__)
 180 #      define RUNFILE "/data/dnsmasq.pid"
 181 #    else
 182 #      define RUNFILE "/var/run/dnsmasq.pid"
 183 #    endif
 184 #endif
 185
 186 /* platform dependent options: these are determined automatically below
 187
 188 HAVE_LINUX_NETWORK
 189 HAVE_BSD_NETWORK
 190 HAVE_SOLARIS_NETWORK
 191    define exactly one of these to alter interaction with kernel networking.
 192
 193 HAVE_GETOPT_LONG
 194    defined when GNU-style getopt_long available.
 195
 196 HAVE_SOCKADDR_SA_LEN
 197    defined if struct sockaddr has sa_len field (*BSD)
 198 */
 199
 200 /* Must preceed __linux__ since uClinux defines __linux__ too. */
 201 #if defined(__uClinux__)
 202 #define HAVE_LINUX_NETWORK
 203 #define HAVE_GETOPT_LONG
 204 #undef HAVE_SOCKADDR_SA_LEN
 205 /* Never use fork() on uClinux. Note that this is subtly different from the
 206    --keep-in-foreground option, since it also  suppresses forking new
 207    processes for TCP connections and disables the call-a-script on leasechange
 208    system. It's intended for use on MMU-less kernels. */
 209 #define NO_FORK
 210
 211 #elif defined(__UCLIBC__)
 212 #define HAVE_LINUX_NETWORK
 213 #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
 214    ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
 215 #    define HAVE_GETOPT_LONG
 216 #endif
 217 #undef HAVE_SOCKADDR_SA_LEN
 218 #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
 219 #  define NO_FORK
 220 #endif
 221 #if defined(__UCLIBC_HAS_IPV6__)
 222 #  ifndef IPV6_V6ONLY
 223 #    define IPV6_V6ONLY 26
 224 #  endif
 225 #endif
 226
 227 /* This is for glibc 2.x */
 228 #elif defined(__linux__)
 229 #define HAVE_LINUX_NETWORK
 230 #define HAVE_GETOPT_LONG
 231 #undef HAVE_SOCKADDR_SA_LEN
 232
 233 #elif defined(__FreeBSD__) || \
 234       defined(__OpenBSD__) || \
 235       defined(__DragonFly__) || \
 236       defined(__FreeBSD_kernel__)
 237 #define HAVE_BSD_NETWORK
 238 /* Later verions of FreeBSD have getopt_long() */
 239 #if defined(optional_argument) && defined(required_argument)
 240 #   define HAVE_GETOPT_LONG
 241 #endif
 242 #define HAVE_SOCKADDR_SA_LEN
 243
 244 #elif defined(__APPLE__)
 245 #define HAVE_BSD_NETWORK
 246 #define HAVE_GETOPT_LONG
 247 #define HAVE_SOCKADDR_SA_LEN
 248 /* Define before sys/socket.h is included so we get socklen_t */
 249 #define _BSD_SOCKLEN_T_
 250 /* Select the RFC_3542 version of the IPv6 socket API.
 251    Define before netinet6/in6.h is included. */
 252 #define __APPLE_USE_RFC_3542
 253
 254 #elif defined(__NetBSD__)
 255 #define HAVE_BSD_NETWORK
 256 #define HAVE_GETOPT_LONG
 257 #define HAVE_SOCKADDR_SA_LEN
 258
 259 #elif defined(__sun) || defined(__sun__)
 260 #define HAVE_SOLARIS_NETWORK
 261 #define HAVE_GETOPT_LONG
 262 #undef HAVE_SOCKADDR_SA_LEN
 263 #define ETHER_ADDR_LEN 6
 264
 265 #endif
 266
 267 /* Decide if we're going to support IPv6 */
 268 /* We assume that systems which don't have IPv6
 269    headers don't have ntop and pton either */
 270
 271 #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY)
 272 #  define HAVE_IPV6
 273 #  define ADDRSTRLEN INET6_ADDRSTRLEN
 274 #else
 275 #  if !defined(INET_ADDRSTRLEN)
 276 #      define INET_ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
 277 #  endif
 278 #  undef HAVE_IPV6
 279 #  define ADDRSTRLEN INET_ADDRSTRLEN
 280 #endif
 281
 282
 283 /* rules to implement compile-time option dependencies and
 284    the NO_XXX flags */
 285
 286 #ifdef NO_IPV6
 287 #undef HAVE_IPV6
 288 #endif
 289
 290 #ifdef NO_TFTP
 291 #undef HAVE_TFTP
 292 #endif
 293
 294 #ifdef NO_DHCP
 295 #undef HAVE_DHCP
 296 #undef HAVE_DHCP6
 297 #endif
 298
 299 #if defined(NO_DHCP6) || !defined(HAVE_IPV6)
 300 #undef HAVE_DHCP6
 301 #endif
 302
 303 /* DHCP6 needs DHCP too */
 304 #ifdef HAVE_DHCP6
 305 #define HAVE_DHCP
 306 #endif
 307
 308 #if defined(NO_SCRIPT) || !defined(HAVE_DHCP) || defined(NO_FORK)
 309 #undef HAVE_SCRIPT
 310 #undef HAVE_LUASCRIPT
 311 #endif
 312
 313 /* Must HAVE_SCRIPT to HAVE_LUASCRIPT */
 314 #ifdef HAVE_LUASCRIPT
 315 #define HAVE_SCRIPT
 316 #endif
 317
 318 #ifdef NO_AUTH
 319 #undef HAVE_AUTH
 320 #endif
 321
 322 #if defined(NO_IPSET) || !defined(HAVE_LINUX_NETWORK)
 323 #undef HAVE_IPSET
 324 #endif
 325
 326 #ifdef HAVE_TOMATO
 327 #define HAVE_LEASEFILE_EXPIRE
 328 #endif
 329
 330 /* Define a string indicating which options are in use.
 331    DNSMASQP_COMPILE_OPTS is only defined in dnsmasq.c */
 332
 333 #ifdef DNSMASQ_COMPILE_OPTS
 334
 335 static char *compile_opts =
 336 #ifndef HAVE_IPV6
 337 "no-"
 338 #endif
 339 "IPv6 "
 340 #ifndef HAVE_GETOPT_LONG
 341 "no-"
 342 #endif
 343 "GNU-getopt "
 344 #ifdef HAVE_BROKEN_RTC
 345 "no-RTC "
 346 #endif
 347 #ifdef NO_FORK
 348 "no-MMU "
 349 #endif
 350 #ifndef HAVE_DBUS
 351 "no-"
 352 #endif
 353 "DBus "
 354 #ifndef LOCALEDIR
 355 "no-"
 356 #endif
 357 "i18n "
 358 #if !defined(LOCALEDIR) && !defined(HAVE_IDN)
 359 "no-"
 360 #endif
 361 "IDN "
 362 #ifndef HAVE_DHCP
 363 "no-"
 364 #endif
 365 "DHCP "
 366 #if defined(HAVE_DHCP)
 367 #  if !defined (HAVE_DHCP6)
 368      "no-"
 369 #  endif
 370      "DHCPv6 "
 371 #  if !defined(HAVE_SCRIPT)
 372      "no-scripts "
 373 #  else
 374 #    if !defined(HAVE_LUASCRIPT)
 375        "no-"
 376 #    endif
 377      "Lua "
 378 #  endif
 379 #endif
 380 #ifndef HAVE_TFTP
 381 "no-"
 382 #endif
 383 "TFTP "
 384 #ifndef HAVE_CONNTRACK
 385 "no-"
 386 #endif
 387 "conntrack "
 388 #ifndef HAVE_IPSET
 389 "no-"
 390 #endif
 391 "ipset "
 392 #ifdef HAVE_TOMATO
 393   "Tomato-helper "
 394 #endif
 395 #ifndef HAVE_AUTH
 396 "no-"
 397 #endif
 398   "auth";
 399
 400 #endif
 401
 402
 403