San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 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" |
San Mehat | 5658bcb | 2010-01-20 10:16:30 -0800 | [diff] [blame] | 49 | # elif defined(__ANDROID__) |
| 50 | # define LEASEFILE "/data/misc/dhcp/dnsmasq.leases" |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 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 TFTP_PORT 69 |
| 72 | #define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */ |
| 73 | #define LOG_MAX 5 /* log-queue length */ |
| 74 | #define RANDFILE "/dev/urandom" |
| 75 | #define DAD_WAIT 20 /* retry binding IPv6 sockets for this long */ |
| 76 | |
| 77 | /* DBUS interface specifics */ |
| 78 | #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq" |
| 79 | #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq" |
| 80 | |
| 81 | /* A small collection of RR-types which are missing on some platforms */ |
| 82 | |
| 83 | #ifndef T_SIG |
| 84 | # define T_SIG 24 |
| 85 | #endif |
| 86 | |
| 87 | #ifndef T_SRV |
| 88 | # define T_SRV 33 |
| 89 | #endif |
| 90 | |
| 91 | #ifndef T_OPT |
| 92 | # define T_OPT 41 |
| 93 | #endif |
| 94 | |
| 95 | #ifndef T_TKEY |
| 96 | # define T_TKEY 249 |
| 97 | #endif |
| 98 | |
| 99 | #ifndef T_TSIG |
| 100 | # define T_TSIG 250 |
| 101 | #endif |
| 102 | |
| 103 | |
| 104 | /* Follows system specific switches. If you run on a |
| 105 | new system, you may want to edit these. |
| 106 | May replace this with Autoconf one day. |
| 107 | |
| 108 | HAVE_LINUX_NETWORK |
| 109 | HAVE_BSD_NETWORK |
| 110 | HAVE_SOLARIS_NETWORK |
| 111 | define exactly one of these to alter interaction with kernel networking. |
| 112 | |
| 113 | HAVE_BROKEN_RTC |
| 114 | define this on embedded systems which don't have an RTC |
| 115 | which keeps time over reboots. Causes dnsmasq to use uptime |
| 116 | for timing, and keep lease lengths rather than expiry times |
| 117 | in its leases file. This also make dnsmasq "flash disk friendly". |
| 118 | Normally, dnsmasq tries very hard to keep the on-disk leases file |
| 119 | up-to-date: rewriting it after every renewal. When HAVE_BROKEN_RTC |
| 120 | is in effect, the lease file is only written when a new lease is |
| 121 | created, or an old one destroyed. (Because those are the only times |
| 122 | it changes.) This vastly reduces the number of file writes, and makes |
| 123 | it viable to keep the lease file on a flash filesystem. |
| 124 | NOTE: when enabling or disabling this, be sure to delete any old |
| 125 | leases file, otherwise dnsmasq may get very confused. |
| 126 | |
| 127 | HAVE_TFTP |
| 128 | define this to get dnsmasq's built-in TFTP server. |
| 129 | |
| 130 | HAVE_DHCP |
| 131 | define this to get dnsmasq's DHCP server. |
| 132 | |
| 133 | HAVE_SCRIPT |
| 134 | define this to get the ability to call scripts on lease-change |
| 135 | |
| 136 | HAVE_GETOPT_LONG |
| 137 | define this if you have GNU libc or GNU getopt. |
| 138 | |
| 139 | HAVE_ARC4RANDOM |
| 140 | define this if you have arc4random() to get better security from DNS spoofs |
| 141 | by using really random ids (OpenBSD) |
| 142 | |
| 143 | HAVE_SOCKADDR_SA_LEN |
| 144 | define this if struct sockaddr has sa_len field (*BSD) |
| 145 | |
| 146 | HAVE_DBUS |
| 147 | Define this if you want to link against libdbus, and have dnsmasq |
| 148 | define some methods to allow (re)configuration of the upstream DNS |
| 149 | servers via DBus. |
| 150 | |
| 151 | NOTES: |
| 152 | For Linux you should define |
| 153 | HAVE_LINUX_NETWORK |
| 154 | HAVE_GETOPT_LONG |
| 155 | you should NOT define |
| 156 | HAVE_ARC4RANDOM |
| 157 | HAVE_SOCKADDR_SA_LEN |
| 158 | |
| 159 | For *BSD systems you should define |
| 160 | HAVE_BSD_NETWORK |
| 161 | HAVE_SOCKADDR_SA_LEN |
| 162 | and you MAY define |
| 163 | HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later |
| 164 | HAVE_GETOPT_LONG - NetBSD, later FreeBSD |
| 165 | (FreeBSD and OpenBSD only if you link GNU getopt) |
| 166 | |
| 167 | */ |
| 168 | |
| 169 | /* platform independent options- uncomment to enable */ |
| 170 | #define HAVE_DHCP |
| 171 | #define HAVE_TFTP |
| 172 | #define HAVE_SCRIPT |
| 173 | /* #define HAVE_BROKEN_RTC */ |
| 174 | /* #define HAVE_DBUS */ |
| 175 | |
| 176 | /* Allow TFTP to be disabled with COPTS=-DNO_TFTP */ |
| 177 | #ifdef NO_TFTP |
| 178 | #undef HAVE_TFTP |
| 179 | #endif |
| 180 | |
| 181 | /* Allow DHCP to be disabled with COPTS=-DNO_DHCP */ |
| 182 | #ifdef NO_DHCP |
| 183 | #undef HAVE_DHCP |
| 184 | #endif |
| 185 | |
| 186 | /* Allow scripts to be disabled with COPTS=-DNO_SCRIPT */ |
| 187 | #ifdef NO_SCRIPT |
| 188 | #undef HAVE_SCRIPT |
| 189 | #endif |
| 190 | |
| 191 | |
| 192 | |
| 193 | /* platform dependent options. */ |
| 194 | |
| 195 | /* Must preceed __linux__ since uClinux defines __linux__ too. */ |
| 196 | #if defined(__uClinux__) |
| 197 | #define HAVE_LINUX_NETWORK |
| 198 | #define HAVE_GETOPT_LONG |
| 199 | #undef HAVE_ARC4RANDOM |
| 200 | #undef HAVE_SOCKADDR_SA_LEN |
| 201 | /* Never use fork() on uClinux. Note that this is subtly different from the |
| 202 | --keep-in-foreground option, since it also suppresses forking new |
| 203 | processes for TCP connections and disables the call-a-script on leasechange |
| 204 | system. It's intended for use on MMU-less kernels. */ |
| 205 | #define NO_FORK |
| 206 | |
| 207 | #elif defined(__UCLIBC__) |
| 208 | #define HAVE_LINUX_NETWORK |
| 209 | #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \ |
| 210 | ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21)) |
| 211 | # define HAVE_GETOPT_LONG |
| 212 | #endif |
| 213 | #undef HAVE_ARC4RANDOM |
| 214 | #undef HAVE_SOCKADDR_SA_LEN |
| 215 | #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__) |
| 216 | # define NO_FORK |
| 217 | #endif |
| 218 | #if defined(__UCLIBC_HAS_IPV6__) |
| 219 | # ifndef IPV6_V6ONLY |
| 220 | # define IPV6_V6ONLY 26 |
| 221 | # endif |
| 222 | #endif |
| 223 | |
| 224 | /* This is for glibc 2.x */ |
| 225 | #elif defined(__linux__) |
| 226 | #define HAVE_LINUX_NETWORK |
| 227 | #define HAVE_GETOPT_LONG |
| 228 | #undef HAVE_ARC4RANDOM |
| 229 | #undef HAVE_SOCKADDR_SA_LEN |
| 230 | |
| 231 | #elif defined(__FreeBSD__) || \ |
| 232 | defined(__OpenBSD__) || \ |
| 233 | defined(__DragonFly__) || \ |
| 234 | defined (__FreeBSD_kernel__) |
| 235 | #define HAVE_BSD_NETWORK |
| 236 | /* Later verions of FreeBSD have getopt_long() */ |
| 237 | #if defined(optional_argument) && defined(required_argument) |
| 238 | # define HAVE_GETOPT_LONG |
| 239 | #endif |
| 240 | #if !defined (__FreeBSD_kernel__) |
| 241 | # define HAVE_ARC4RANDOM |
| 242 | #endif |
| 243 | #define HAVE_SOCKADDR_SA_LEN |
| 244 | |
| 245 | #elif defined(__APPLE__) |
| 246 | #define HAVE_BSD_NETWORK |
| 247 | #undef HAVE_GETOPT_LONG |
| 248 | #define HAVE_ARC4RANDOM |
| 249 | #define HAVE_SOCKADDR_SA_LEN |
| 250 | /* Define before sys/socket.h is included so we get socklen_t */ |
| 251 | #define _BSD_SOCKLEN_T_ |
| 252 | |
| 253 | #elif defined(__NetBSD__) |
| 254 | #define HAVE_BSD_NETWORK |
| 255 | #define HAVE_GETOPT_LONG |
| 256 | #undef HAVE_ARC4RANDOM |
| 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_ARC4RANDOM |
| 263 | #undef HAVE_SOCKADDR_SA_LEN |
| 264 | #define _XPG4_2 |
| 265 | #define __EXTENSIONS__ |
| 266 | #define ETHER_ADDR_LEN 6 |
| 267 | |
| 268 | #endif |
| 269 | |
| 270 | /* Decide if we're going to support IPv6 */ |
| 271 | /* IPv6 can be forced off with "make COPTS=-DNO_IPV6" */ |
| 272 | /* We assume that systems which don't have IPv6 |
| 273 | headers don't have ntop and pton either */ |
| 274 | |
| 275 | #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6) |
| 276 | # define HAVE_IPV6 |
| 277 | # define ADDRSTRLEN INET6_ADDRSTRLEN |
| 278 | # if defined(SOL_IPV6) |
| 279 | # define IPV6_LEVEL SOL_IPV6 |
| 280 | # else |
| 281 | # define IPV6_LEVEL IPPROTO_IPV6 |
| 282 | # endif |
| 283 | #elif defined(INET_ADDRSTRLEN) |
| 284 | # undef HAVE_IPV6 |
| 285 | # define ADDRSTRLEN INET_ADDRSTRLEN |
| 286 | #else |
| 287 | # undef HAVE_IPV6 |
| 288 | # define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */ |
| 289 | #endif |
| 290 | |
| 291 | /* Can't do scripts without fork */ |
| 292 | #ifdef NOFORK |
| 293 | # undef HAVE_SCRIPT |
| 294 | #endif |
| 295 | |