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 #ifdef __uClinux__ 37 # define RESOLVFILE "/etc/config/resolv.conf" 38 #else 39 # define RESOLVFILE "/etc/resolv.conf" 40 #endif 41 #define RUNFILE "/var/run/dnsmasq.pid" 42 43 #ifndef LEASEFILE 44 # if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__) 45 # define LEASEFILE "/var/db/dnsmasq.leases" 46 # elif defined(__sun__) || defined (__sun) 47 # define LEASEFILE "/var/cache/dnsmasq.leases" 48 # elif defined(__ANDROID__) 49 # define LEASEFILE "/data/misc/dhcp/dnsmasq.leases" 50 # else 51 # define LEASEFILE "/var/lib/misc/dnsmasq.leases" 52 # endif 53 #endif 54 55 #ifndef CONFFILE 56 # if defined(__FreeBSD__) 57 # define CONFFILE "/usr/local/etc/dnsmasq.conf" 58 # else 59 # define CONFFILE "/etc/dnsmasq.conf" 60 # endif 61 #endif 62 63 #define DEFLEASE 3600 /* default lease time, 1 hour */ 64 #define CHUSER "nobody" 65 #define CHGRP "dip" 66 #define DHCP_SERVER_PORT 67 67 #define DHCP_CLIENT_PORT 68 68 #define DHCP_SERVER_ALTPORT 1067 69 #define DHCP_CLIENT_ALTPORT 1068 70 #define LOG_MAX 5 /* log-queue length */ 71 #define RANDFILE "/dev/urandom" 72 #define DAD_WAIT 20 /* retry binding IPv6 sockets for this long */ 73 74 /* A small collection of RR-types which are missing on some platforms */ 75 76 #ifndef T_SIG 77 # define T_SIG 24 78 #endif 79 80 #ifndef T_SRV 81 # define T_SRV 33 82 #endif 83 84 #ifndef T_OPT 85 # define T_OPT 41 86 #endif 87 88 #ifndef T_TKEY 89 # define T_TKEY 249 90 #endif 91 92 #ifndef T_TSIG 93 # define T_TSIG 250 94 #endif 95 96 97 /* Follows system specific switches. If you run on a 98 new system, you may want to edit these. 99 May replace this with Autoconf one day. 100 101 HAVE_LINUX_NETWORK 102 HAVE_BSD_NETWORK 103 HAVE_SOLARIS_NETWORK 104 define exactly one of these to alter interaction with kernel networking. 105 106 HAVE_BROKEN_RTC 107 define this on embedded systems which don't have an RTC 108 which keeps time over reboots. Causes dnsmasq to use uptime 109 for timing, and keep lease lengths rather than expiry times 110 in its leases file. This also make dnsmasq "flash disk friendly". 111 Normally, dnsmasq tries very hard to keep the on-disk leases file 112 up-to-date: rewriting it after every renewal. When HAVE_BROKEN_RTC 113 is in effect, the lease file is only written when a new lease is 114 created, or an old one destroyed. (Because those are the only times 115 it changes.) This vastly reduces the number of file writes, and makes 116 it viable to keep the lease file on a flash filesystem. 117 NOTE: when enabling or disabling this, be sure to delete any old 118 leases file, otherwise dnsmasq may get very confused. 119 120 HAVE_DHCP 121 define this to get dnsmasq's DHCP server. 122 123 HAVE_SCRIPT 124 define this to get the ability to call scripts on lease-change 125 126 HAVE_GETOPT_LONG 127 define this if you have GNU libc or GNU getopt. 128 129 HAVE_ARC4RANDOM 130 define this if you have arc4random() to get better security from DNS spoofs 131 by using really random ids (OpenBSD) 132 133 HAVE_SOCKADDR_SA_LEN 134 define this if struct sockaddr has sa_len field (*BSD) 135 136 NOTES: 137 For Linux you should define 138 HAVE_LINUX_NETWORK 139 HAVE_GETOPT_LONG 140 you should NOT define 141 HAVE_ARC4RANDOM 142 HAVE_SOCKADDR_SA_LEN 143 144 For *BSD systems you should define 145 HAVE_BSD_NETWORK 146 HAVE_SOCKADDR_SA_LEN 147 and you MAY define 148 HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later 149 HAVE_GETOPT_LONG - NetBSD, later FreeBSD 150 (FreeBSD and OpenBSD only if you link GNU getopt) 151 152 */ 153 154 /* platform independent options- uncomment to enable */ 155 #define HAVE_DHCP 156 #define HAVE_SCRIPT 157 /* #define HAVE_BROKEN_RTC */ 158 159 /* Allow DHCP to be disabled with COPTS=-DNO_DHCP */ 160 #ifdef NO_DHCP 161 #undef HAVE_DHCP 162 #endif 163 164 /* Allow scripts to be disabled with COPTS=-DNO_SCRIPT */ 165 #ifdef NO_SCRIPT 166 #undef HAVE_SCRIPT 167 #endif 168 169 170 171 /* platform dependent options. */ 172 173 /* Must preceed __linux__ since uClinux defines __linux__ too. */ 174 #if defined(__uClinux__) 175 #define HAVE_LINUX_NETWORK 176 #define HAVE_GETOPT_LONG 177 #undef HAVE_ARC4RANDOM 178 #undef HAVE_SOCKADDR_SA_LEN 179 /* Never use fork() on uClinux. Note that this is subtly different from the 180 --keep-in-foreground option, since it also suppresses forking new 181 processes for TCP connections and disables the call-a-script on leasechange 182 system. It's intended for use on MMU-less kernels. */ 183 #define NO_FORK 184 185 #elif defined(__UCLIBC__) 186 #define HAVE_LINUX_NETWORK 187 #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \ 188 ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21)) 189 # define HAVE_GETOPT_LONG 190 #endif 191 #undef HAVE_ARC4RANDOM 192 #undef HAVE_SOCKADDR_SA_LEN 193 #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__) 194 # define NO_FORK 195 #endif 196 #if defined(__UCLIBC_HAS_IPV6__) 197 # ifndef IPV6_V6ONLY 198 # define IPV6_V6ONLY 26 199 # endif 200 #endif 201 202 /* This is for glibc 2.x */ 203 #elif defined(__linux__) 204 #define HAVE_LINUX_NETWORK 205 #define HAVE_GETOPT_LONG 206 #undef HAVE_ARC4RANDOM 207 #undef HAVE_SOCKADDR_SA_LEN 208 209 #elif defined(__FreeBSD__) || \ 210 defined(__OpenBSD__) || \ 211 defined(__DragonFly__) || \ 212 defined (__FreeBSD_kernel__) 213 #define HAVE_BSD_NETWORK 214 /* Later verions of FreeBSD have getopt_long() */ 215 #if defined(optional_argument) && defined(required_argument) 216 # define HAVE_GETOPT_LONG 217 #endif 218 #if !defined (__FreeBSD_kernel__) 219 # define HAVE_ARC4RANDOM 220 #endif 221 #define HAVE_SOCKADDR_SA_LEN 222 223 #elif defined(__APPLE__) 224 #define HAVE_BSD_NETWORK 225 #undef HAVE_GETOPT_LONG 226 #define HAVE_ARC4RANDOM 227 #define HAVE_SOCKADDR_SA_LEN 228 /* Define before sys/socket.h is included so we get socklen_t */ 229 #define _BSD_SOCKLEN_T_ 230 231 #elif defined(__NetBSD__) 232 #define HAVE_BSD_NETWORK 233 #define HAVE_GETOPT_LONG 234 #undef HAVE_ARC4RANDOM 235 #define HAVE_SOCKADDR_SA_LEN 236 237 #elif defined(__sun) || defined(__sun__) 238 #define HAVE_SOLARIS_NETWORK 239 #define HAVE_GETOPT_LONG 240 #undef HAVE_ARC4RANDOM 241 #undef HAVE_SOCKADDR_SA_LEN 242 #define _XPG4_2 243 #define __EXTENSIONS__ 244 #define ETHER_ADDR_LEN 6 245 246 #endif 247 248 /* Decide if we're going to support IPv6 */ 249 /* IPv6 can be forced off with "make COPTS=-DNO_IPV6" */ 250 /* We assume that systems which don't have IPv6 251 headers don't have ntop and pton either */ 252 253 #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6) 254 # define HAVE_IPV6 255 # define ADDRSTRLEN INET6_ADDRSTRLEN 256 # if defined(SOL_IPV6) 257 # define IPV6_LEVEL SOL_IPV6 258 # else 259 # define IPV6_LEVEL IPPROTO_IPV6 260 # endif 261 #elif defined(INET_ADDRSTRLEN) 262 # undef HAVE_IPV6 263 # define ADDRSTRLEN INET_ADDRSTRLEN 264 #else 265 # undef HAVE_IPV6 266 # define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */ 267 #endif 268 269 /* Can't do scripts without fork */ 270 #ifdef NOFORK 271 # undef HAVE_SCRIPT 272 #endif 273 274
