src/config.h

   1 /* dnsmasq is Copyright (c) 2000-2011 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 VERSION "2.57"
  18
  19 #define FTABSIZ 150 /* max number of outstanding requests (default) */
  20 #define MAX_PROCS 20 /* max no children for TCP requests */
  21 #define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
  22 #define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
  23 #define TIMEOUT 10 /* drop UDP queries after TIMEOUT seconds */
  24 #define FORWARD_TEST 50 /* try all servers every 50 queries */
  25 #define FORWARD_TIME 20 /* or 20 seconds */
  26 #define RANDOM_SOCKS 64 /* max simultaneous random ports */
  27 #define LEASE_RETRY 60 /* on error, retry writing leasefile after LEASE_RETRY seconds */
  28 #define CACHESIZ 150 /* default cache size */
  29 #define MAXLEASES 1000 /* maximum number of DHCP leases */
  30 #define PING_WAIT 3 /* wait for ping address-in-use test */
  31 #define PING_CACHE_TIME 30 /* Ping test assumed to be valid this long. */
  32 #define DECLINE_BACKOFF 600 /* disable DECLINEd static addresses for this long */
  33 #define DHCP_PACKET_MAX 16384 /* hard limit on DHCP packet size */
  34 #define SMALLDNAME 40 /* most domain names are smaller than this */
  35 #define HOSTSFILE "/etc/hosts"
  36 #define ETHERSFILE "/etc/ethers"
  37 #ifdef __uClinux__
  38 #  define RESOLVFILE "/etc/config/resolv.conf"
  39 #else
  40 #  define RESOLVFILE "/etc/resolv.conf"
  41 #endif
  42 #define RUNFILE "/var/run/dnsmasq.pid"
  43
  44 #ifndef LEASEFILE
  45 #   if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
  46 #      define LEASEFILE "/var/db/dnsmasq.leases"
  47 #   elif defined(__sun__) || defined (__sun)
  48 #      define LEASEFILE "/var/cache/dnsmasq.leases"
  49 #   elif defined(__ANDROID__)
  50 #      define LEASEFILE "/data/misc/dhcp/dnsmasq.leases"
  51 #   else
  52 #      define LEASEFILE "/var/lib/misc/dnsmasq.leases"
  53 #   endif
  54 #endif
  55
  56 #ifndef CONFFILE
  57 #   if defined(__FreeBSD__)
  58 #      define CONFFILE "/usr/local/etc/dnsmasq.conf"
  59 #   else
  60 #      define CONFFILE "/etc/dnsmasq.conf"
  61 #   endif
  62 #endif
  63
  64 #define DEFLEASE 3600 /* default lease time, 1 hour */
  65 #define CHUSER "nobody"
  66 #define CHGRP "dip"
  67 #define NAMESERVER_PORT 53
  68 #define DHCP_SERVER_PORT 67
  69 #define DHCP_CLIENT_PORT 68
  70 #define DHCP_SERVER_ALTPORT 1067
  71 #define DHCP_CLIENT_ALTPORT 1068
  72 #define PXE_PORT 4011
  73 #define TFTP_PORT 69
  74 #define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
  75 #define LOG_MAX 5 /* log-queue length */
  76 #define RANDFILE "/dev/urandom"
  77 #define DAD_WAIT 20 /* retry binding IPv6 sockets for this long */
  78 #define EDNS0_OPTION_MAC 5 /* dyndns.org temporary assignment */
  79
  80 /* DBUS interface specifics */
  81 #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq"
  82 #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
  83
  84 /* Follows system specific switches. If you run on a
  85    new system, you may want to edit these.
  86    May replace this with Autoconf one day.
  87
  88 HAVE_LINUX_NETWORK
  89 HAVE_BSD_NETWORK
  90 HAVE_SOLARIS_NETWORK
  91    define exactly one of these to alter interaction with kernel networking.
  92
  93 HAVE_BROKEN_RTC
  94    define this on embedded systems which don't have an RTC
  95    which keeps time over reboots. Causes dnsmasq to use uptime
  96    for timing, and keep lease lengths rather than expiry times
  97    in its leases file. This also make dnsmasq "flash disk friendly".
  98    Normally, dnsmasq tries very hard to keep the on-disk leases file
  99    up-to-date: rewriting it after every renewal.  When HAVE_BROKEN_RTC
 100    is in effect, the lease file is only written when a new lease is
 101    created, or an old one destroyed. (Because those are the only times
 102    it changes.) This vastly reduces the number of file writes, and makes
 103    it viable to keep the lease file on a flash filesystem.
 104    NOTE: when enabling or disabling this, be sure to delete any old
 105    leases file, otherwise dnsmasq may get very confused.
 106
 107 HAVE_TFTP
 108    define this to get dnsmasq's built-in TFTP server.
 109
 110 HAVE_DHCP
 111    define this to get dnsmasq's DHCP server.
 112
 113 HAVE_SCRIPT
 114    define this to get the ability to call scripts on lease-change
 115
 116 HAVE_GETOPT_LONG
 117    define this if you have GNU libc or GNU getopt.
 118
 119 HAVE_ARC4RANDOM
 120    define this if you have arc4random() to get better security from DNS spoofs
 121    by using really random ids (OpenBSD)
 122
 123 HAVE_SOCKADDR_SA_LEN
 124    define this if struct sockaddr has sa_len field (*BSD)
 125
 126 HAVE_DBUS
 127    define this if you want to link against libdbus, and have dnsmasq
 128    support some methods to allow (re)configuration of the upstream DNS
 129    servers via DBus.
 130
 131 HAVE_IDN
 132    define this if you want international domain name support.
 133    NOTE: for backwards compatibility, IDN support is automatically
 134          included when internationalisation support is built, using the
 135          *-i18n makefile targets, even if HAVE_IDN is not explicitly set.
 136
 137 NOTES:
 138    For Linux you should define
 139       HAVE_LINUX_NETWORK
 140       HAVE_GETOPT_LONG
 141   you should NOT define
 142       HAVE_ARC4RANDOM
 143       HAVE_SOCKADDR_SA_LEN
 144
 145    For *BSD systems you should define
 146      HAVE_BSD_NETWORK
 147      HAVE_SOCKADDR_SA_LEN
 148    and you MAY define
 149      HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later
 150      HAVE_GETOPT_LONG - NetBSD, later FreeBSD
 151                        (FreeBSD and OpenBSD only if you link GNU getopt)
 152
 153 */
 154
 155 /* platform independent options- uncomment to enable */
 156 #define HAVE_DHCP
 157 #define HAVE_TFTP
 158 #define HAVE_SCRIPT
 159 /* #define HAVE_BROKEN_RTC */
 160 /* #define HAVE_DBUS */
 161 /* #define HAVE_IDN */
 162
 163 /* Allow TFTP to be disabled with COPTS=-DNO_TFTP */
 164 #ifdef NO_TFTP
 165 #undef HAVE_TFTP
 166 #endif
 167
 168 /* Allow DHCP to be disabled with COPTS=-DNO_DHCP */
 169 #ifdef NO_DHCP
 170 #undef HAVE_DHCP
 171 #endif
 172
 173 /* Allow scripts to be disabled with COPTS=-DNO_SCRIPT */
 174 #ifdef NO_SCRIPT
 175 #undef HAVE_SCRIPT
 176 #endif
 177
 178
 179
 180 /* platform dependent options. */
 181
 182 /* Must preceed __linux__ since uClinux defines __linux__ too. */
 183 #if defined(__uClinux__)
 184 #define HAVE_LINUX_NETWORK
 185 #define HAVE_GETOPT_LONG
 186 #undef HAVE_ARC4RANDOM
 187 #undef HAVE_SOCKADDR_SA_LEN
 188 /* Never use fork() on uClinux. Note that this is subtly different from the
 189    --keep-in-foreground option, since it also  suppresses forking new
 190    processes for TCP connections and disables the call-a-script on leasechange
 191    system. It's intended for use on MMU-less kernels. */
 192 #define NO_FORK
 193
 194 #elif defined(__UCLIBC__)
 195 #define HAVE_LINUX_NETWORK
 196 #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
 197    ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
 198 #    define HAVE_GETOPT_LONG
 199 #endif
 200 #undef HAVE_ARC4RANDOM
 201 #undef HAVE_SOCKADDR_SA_LEN
 202 #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
 203 #  define NO_FORK
 204 #endif
 205 #if defined(__UCLIBC_HAS_IPV6__)
 206 #  ifndef IPV6_V6ONLY
 207 #    define IPV6_V6ONLY 26
 208 #  endif
 209 #endif
 210
 211 /* This is for glibc 2.x */
 212 #elif defined(__linux__)
 213 #define HAVE_LINUX_NETWORK
 214 #define HAVE_GETOPT_LONG
 215 #undef HAVE_ARC4RANDOM
 216 #undef HAVE_SOCKADDR_SA_LEN
 217
 218 #elif defined(__FreeBSD__) || \
 219       defined(__OpenBSD__) || \
 220       defined(__DragonFly__) || \
 221       defined(__FreeBSD_kernel__)
 222 #define HAVE_BSD_NETWORK
 223 /* Later verions of FreeBSD have getopt_long() */
 224 #if defined(optional_argument) && defined(required_argument)
 225 #   define HAVE_GETOPT_LONG
 226 #endif
 227 #if !defined(__FreeBSD_kernel__)
 228 #   define HAVE_ARC4RANDOM
 229 #endif
 230 #define HAVE_SOCKADDR_SA_LEN
 231
 232 #elif defined(__APPLE__)
 233 #define HAVE_BSD_NETWORK
 234 #define HAVE_GETOPT_LONG
 235 #define HAVE_ARC4RANDOM
 236 #define HAVE_SOCKADDR_SA_LEN
 237 /* Define before sys/socket.h is included so we get socklen_t */
 238 #define _BSD_SOCKLEN_T_
 239
 240 #elif defined(__NetBSD__)
 241 #define HAVE_BSD_NETWORK
 242 #define HAVE_GETOPT_LONG
 243 #undef HAVE_ARC4RANDOM
 244 #define HAVE_SOCKADDR_SA_LEN
 245
 246 #elif defined(__sun) || defined(__sun__)
 247 #define HAVE_SOLARIS_NETWORK
 248 #define HAVE_GETOPT_LONG
 249 #undef HAVE_ARC4RANDOM
 250 #undef HAVE_SOCKADDR_SA_LEN
 251 #define ETHER_ADDR_LEN 6
 252
 253 #endif
 254
 255 /* Decide if we're going to support IPv6 */
 256 /* IPv6 can be forced off with "make COPTS=-DNO_IPV6" */
 257 /* We assume that systems which don't have IPv6
 258    headers don't have ntop and pton either */
 259
 260 #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6)
 261 #  define HAVE_IPV6
 262 #  define ADDRSTRLEN INET6_ADDRSTRLEN
 263 #  if defined(SOL_IPV6)
 264 #    define IPV6_LEVEL SOL_IPV6
 265 #  else
 266 #    define IPV6_LEVEL IPPROTO_IPV6
 267 #  endif
 268 #elif defined(INET_ADDRSTRLEN)
 269 #  undef HAVE_IPV6
 270 #  define ADDRSTRLEN INET_ADDRSTRLEN
 271 #else
 272 #  undef HAVE_IPV6
 273 #  define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
 274 #endif
 275
 276 /* Can't do scripts without fork */
 277 #ifdef NOFORK
 278 #  undef HAVE_SCRIPT
 279 #endif
 280