1 /* dnsmasq is Copyright (c) 2000-2009 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 "2.51" 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 1280 /* default max EDNS.0 UDP packet from RFC2671 */ 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 10 /* or 10 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 150 /* 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 DHCP_SERVER_PORT 67 68 #define DHCP_CLIENT_PORT 68 69 #define DHCP_SERVER_ALTPORT 1067 70 #define DHCP_CLIENT_ALTPORT 1068 71 #define LOG_MAX 5 /* log-queue length */ 72 #define RANDFILE "/dev/urandom" 73 #define DAD_WAIT 20 /* retry binding IPv6 sockets for this long */ 74 75 /* A small collection of RR-types which are missing on some platforms */ 76 77 #ifndef T_SIG 78 # define T_SIG 24 79 #endif 80 81 #ifndef T_SRV 82 # define T_SRV 33 83 #endif 84 85 #ifndef T_OPT 86 # define T_OPT 41 87 #endif 88 89 #ifndef T_TKEY 90 # define T_TKEY 249 91 #endif 92 93 #ifndef T_TSIG 94 # define T_TSIG 250 95 #endif 96 97 98 /* Follows system specific switches. If you run on a 99 new system, you may want to edit these. 100 May replace this with Autoconf one day. 101 102 HAVE_LINUX_NETWORK 103 HAVE_BSD_NETWORK 104 HAVE_SOLARIS_NETWORK 105 define exactly one of these to alter interaction with kernel networking. 106 107 HAVE_BROKEN_RTC 108 define this on embedded systems which don't have an RTC 109 which keeps time over reboots. Causes dnsmasq to use uptime 110 for timing, and keep lease lengths rather than expiry times 111 in its leases file. This also make dnsmasq "flash disk friendly". 112 Normally, dnsmasq tries very hard to keep the on-disk leases file 113 up-to-date: rewriting it after every renewal. When HAVE_BROKEN_RTC 114 is in effect, the lease file is only written when a new lease is 115 created, or an old one destroyed. (Because those are the only times 116 it changes.) This vastly reduces the number of file writes, and makes 117 it viable to keep the lease file on a flash filesystem. 118 NOTE: when enabling or disabling this, be sure to delete any old 119 leases file, otherwise dnsmasq may get very confused. 120 121 HAVE_DHCP 122 define this to get dnsmasq's DHCP server. 123 124 HAVE_SCRIPT 125 define this to get the ability to call scripts on lease-change 126 127 HAVE_GETOPT_LONG 128 define this if you have GNU libc or GNU getopt. 129 130 HAVE_ARC4RANDOM 131 define this if you have arc4random() to get better security from DNS spoofs 132 by using really random ids (OpenBSD) 133 134 HAVE_SOCKADDR_SA_LEN 135 define this if struct sockaddr has sa_len field (*BSD) 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_SCRIPT 158 /* #define HAVE_BROKEN_RTC */ 159 160 /* Allow DHCP to be disabled with COPTS=-DNO_DHCP */ 161 #ifdef NO_DHCP 162 #undef HAVE_DHCP 163 #endif 164 165 /* Allow scripts to be disabled with COPTS=-DNO_SCRIPT */ 166 #ifdef NO_SCRIPT 167 #undef HAVE_SCRIPT 168 #endif 169 170 171 172 /* platform dependent options. */ 173 174 /* Must preceed __linux__ since uClinux defines __linux__ too. */ 175 #if defined(__uClinux__) 176 #define HAVE_LINUX_NETWORK 177 #define HAVE_GETOPT_LONG 178 #undef HAVE_ARC4RANDOM 179 #undef HAVE_SOCKADDR_SA_LEN 180 /* Never use fork() on uClinux. Note that this is subtly different from the 181 --keep-in-foreground option, since it also suppresses forking new 182 processes for TCP connections and disables the call-a-script on leasechange 183 system. It's intended for use on MMU-less kernels. */ 184 #define NO_FORK 185 186 #elif defined(__UCLIBC__) 187 #define HAVE_LINUX_NETWORK 188 #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \ 189 ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21)) 190 # define HAVE_GETOPT_LONG 191 #endif 192 #undef HAVE_ARC4RANDOM 193 #undef HAVE_SOCKADDR_SA_LEN 194 #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__) 195 # define NO_FORK 196 #endif 197 #if defined(__UCLIBC_HAS_IPV6__) 198 # ifndef IPV6_V6ONLY 199 # define IPV6_V6ONLY 26 200 # endif 201 #endif 202 203 /* This is for glibc 2.x */ 204 #elif defined(__linux__) 205 #define HAVE_LINUX_NETWORK 206 #define HAVE_GETOPT_LONG 207 #undef HAVE_ARC4RANDOM 208 #undef HAVE_SOCKADDR_SA_LEN 209 210 #elif defined(__FreeBSD__) || \ 211 defined(__OpenBSD__) || \ 212 defined(__DragonFly__) || \ 213 defined (__FreeBSD_kernel__) 214 #define HAVE_BSD_NETWORK 215 /* Later verions of FreeBSD have getopt_long() */ 216 #if defined(optional_argument) && defined(required_argument) 217 # define HAVE_GETOPT_LONG 218 #endif 219 #if !defined (__FreeBSD_kernel__) 220 # define HAVE_ARC4RANDOM 221 #endif 222 #define HAVE_SOCKADDR_SA_LEN 223 224 #elif defined(__APPLE__) 225 #define HAVE_BSD_NETWORK 226 #undef HAVE_GETOPT_LONG 227 #define HAVE_ARC4RANDOM 228 #define HAVE_SOCKADDR_SA_LEN 229 /* Define before sys/socket.h is included so we get socklen_t */ 230 #define _BSD_SOCKLEN_T_ 231 232 #elif defined(__NetBSD__) 233 #define HAVE_BSD_NETWORK 234 #define HAVE_GETOPT_LONG 235 #undef HAVE_ARC4RANDOM 236 #define HAVE_SOCKADDR_SA_LEN 237 238 #elif defined(__sun) || defined(__sun__) 239 #define HAVE_SOLARIS_NETWORK 240 #define HAVE_GETOPT_LONG 241 #undef HAVE_ARC4RANDOM 242 #undef HAVE_SOCKADDR_SA_LEN 243 #define _XPG4_2 244 #define __EXTENSIONS__ 245 #define ETHER_ADDR_LEN 6 246 247 #endif 248 249 /* Decide if we're going to support IPv6 */ 250 /* IPv6 can be forced off with "make COPTS=-DNO_IPV6" */ 251 /* We assume that systems which don't have IPv6 252 headers don't have ntop and pton either */ 253 254 #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6) 255 # define HAVE_IPV6 256 # define ADDRSTRLEN INET6_ADDRSTRLEN 257 # if defined(SOL_IPV6) 258 # define IPV6_LEVEL SOL_IPV6 259 # else 260 # define IPV6_LEVEL IPPROTO_IPV6 261 # endif 262 #elif defined(INET_ADDRSTRLEN) 263 # undef HAVE_IPV6 264 # define ADDRSTRLEN INET_ADDRSTRLEN 265 #else 266 # undef HAVE_IPV6 267 # define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */ 268 #endif 269 270 /* Can't do scripts without fork */ 271 #ifdef NOFORK 272 # undef HAVE_SCRIPT 273 #endif 274 275
