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 EDNS0_OPTION_MAC 5 /* dyndns.org temporary assignment */
43: #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq" /* Default - may be overridden by config */
44: #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
45: #define AUTH_TTL 600 /* default TTL for auth DNS */
46: #define SOA_REFRESH 1200 /* SOA refresh default */
47: #define SOA_RETRY 180 /* SOA retry default */
48: #define SOA_EXPIRY 1209600 /* SOA expiry default */
49: #define RA_INTERVAL 600 /* Send unsolicited RA's this often when not provoked. */
50:
51: /* compile-time options: uncomment below to enable or do eg.
52: make COPTS=-DHAVE_BROKEN_RTC
53:
54: HAVE_BROKEN_RTC
55: define this on embedded systems which don't have an RTC
56: which keeps time over reboots. Causes dnsmasq to use uptime
57: for timing, and keep lease lengths rather than expiry times
58: in its leases file. This also make dnsmasq "flash disk friendly".
59: Normally, dnsmasq tries very hard to keep the on-disk leases file
60: up-to-date: rewriting it after every renewal. When HAVE_BROKEN_RTC
61: is in effect, the lease file is only written when a new lease is
62: created, or an old one destroyed. (Because those are the only times
63: it changes.) This vastly reduces the number of file writes, and makes
64: it viable to keep the lease file on a flash filesystem.
65: NOTE: when enabling or disabling this, be sure to delete any old
66: leases file, otherwise dnsmasq may get very confused.
67:
68: HAVE_TFTP
69: define this to get dnsmasq's built-in TFTP server.
70:
71: HAVE_DHCP
72: define this to get dnsmasq's DHCPv4 server.
73:
74: HAVE_DHCP6
75: define this to get dnsmasq's DHCPv6 server. (implies HAVE_DHCP).
76:
77: HAVE_SCRIPT
78: define this to get the ability to call scripts on lease-change.
79:
80: HAVE_LUASCRIPT
81: define this to get the ability to call Lua script on lease-change. (implies HAVE_SCRIPT)
82:
83: HAVE_DBUS
84: define this if you want to link against libdbus, and have dnsmasq
85: support some methods to allow (re)configuration of the upstream DNS
86: servers via DBus.
87:
88: HAVE_IDN
89: define this if you want international domain name support.
90: NOTE: for backwards compatibility, IDN support is automatically
91: included when internationalisation support is built, using the
92: *-i18n makefile targets, even if HAVE_IDN is not explicitly set.
93:
94: HAVE_CONNTRACK
95: define this to include code which propogates conntrack marks from
96: incoming DNS queries to the corresponding upstream queries. This adds
97: a build-dependency on libnetfilter_conntrack, but the resulting binary will
98: still run happily on a kernel without conntrack support.
99:
100: HAVE_IPSET
101: define this to include the ability to selectively add resolved ip addresses
102: to given ipsets.
103:
104: HAVE_AUTH
105: define this to include the facility to act as an authoritative DNS
106: server for one or more zones.
107:
108:
109: NO_IPV6
110: NO_TFTP
111: NO_DHCP
112: NO_DHCP6
113: NO_SCRIPT
114: NO_LARGEFILE
115: NO_AUTH
116: these are avilable to explictly disable compile time options which would
117: otherwise be enabled automatically (HAVE_IPV6, >2Gb file sizes) or
118: which are enabled by default in the distributed source tree. Building dnsmasq
119: with something like "make COPTS=-DNO_SCRIPT" will do the trick.
120:
121: LEASEFILE
122: CONFFILE
123: RESOLVFILE
124: the default locations of these files are determined below, but may be overridden
125: in a build command line using COPTS.
126:
127: */
128:
129:
130: /* The default set of options to build. Built with these options, dnsmasq
131: has no library dependencies other than libc */
132:
133: #define HAVE_DHCP
134: #define HAVE_DHCP6
135: #define HAVE_TFTP
136: #define HAVE_SCRIPT
137: #define HAVE_AUTH
138: #define HAVE_IPSET
139: /* #define HAVE_LUASCRIPT */
140: /* #define HAVE_BROKEN_RTC */
141: /* #define HAVE_DBUS */
142: /* #define HAVE_IDN */
143: /* #define HAVE_CONNTRACK */
144:
145:
146: /* Default locations for important system files. */
147:
148: #ifndef LEASEFILE
149: # if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
150: # define LEASEFILE "/var/db/dnsmasq.leases"
151: # elif defined(__sun__) || defined (__sun)
152: # define LEASEFILE "/var/cache/dnsmasq.leases"
153: # elif defined(__ANDROID__)
154: # define LEASEFILE "/data/misc/dhcp/dnsmasq.leases"
155: # else
156: # define LEASEFILE "/var/lib/misc/dnsmasq.leases"
157: # endif
158: #endif
159:
160: #ifndef CONFFILE
161: # if defined(__FreeBSD__)
162: # define CONFFILE "/usr/local/etc/dnsmasq.conf"
163: # else
164: # define CONFFILE "/etc/dnsmasq.conf"
165: # endif
166: #endif
167:
168: #ifndef RESOLVFILE
169: # if defined(__uClinux__)
170: # define RESOLVFILE "/etc/config/resolv.conf"
171: # else
172: # define RESOLVFILE "/etc/resolv.conf"
173: # endif
174: #endif
175:
176: #ifndef RUNFILE
177: # if defined(__ANDROID__)
178: # define RUNFILE "/data/dnsmasq.pid"
179: # else
180: # define RUNFILE "/var/run/dnsmasq.pid"
181: # endif
182: #endif
183:
184: /* platform dependent options: these are determined automatically below
185:
186: HAVE_LINUX_NETWORK
187: HAVE_BSD_NETWORK
188: HAVE_SOLARIS_NETWORK
189: define exactly one of these to alter interaction with kernel networking.
190:
191: HAVE_GETOPT_LONG
192: defined when GNU-style getopt_long available.
193:
194: HAVE_ARC4RANDOM
195: defined if arc4random() available to get better security from DNS spoofs
196: by using really random ids (OpenBSD)
197:
198: HAVE_SOCKADDR_SA_LEN
199: defined if struct sockaddr has sa_len field (*BSD)
200: */
201:
202: /* Must preceed __linux__ since uClinux defines __linux__ too. */
203: #if defined(__uClinux__)
204: #define HAVE_LINUX_NETWORK
205: #define HAVE_GETOPT_LONG
206: #undef HAVE_ARC4RANDOM
207: #undef HAVE_SOCKADDR_SA_LEN
208: /* Never use fork() on uClinux. Note that this is subtly different from the
209: --keep-in-foreground option, since it also suppresses forking new
210: processes for TCP connections and disables the call-a-script on leasechange
211: system. It's intended for use on MMU-less kernels. */
212: #define NO_FORK
213:
214: #elif defined(__UCLIBC__)
215: #define HAVE_LINUX_NETWORK
216: #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
217: ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
218: # define HAVE_GETOPT_LONG
219: #endif
220: #undef HAVE_ARC4RANDOM
221: #undef HAVE_SOCKADDR_SA_LEN
222: #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
223: # define NO_FORK
224: #endif
225: #if defined(__UCLIBC_HAS_IPV6__)
226: # ifndef IPV6_V6ONLY
227: # define IPV6_V6ONLY 26
228: # endif
229: #endif
230:
231: /* This is for glibc 2.x */
232: #elif defined(__linux__)
233: #define HAVE_LINUX_NETWORK
234: #define HAVE_GETOPT_LONG
235: #undef HAVE_ARC4RANDOM
236: #undef HAVE_SOCKADDR_SA_LEN
237:
238: #elif defined(__FreeBSD__) || \
239: defined(__OpenBSD__) || \
240: defined(__DragonFly__) || \
241: defined(__FreeBSD_kernel__)
242: #define HAVE_BSD_NETWORK
243: /* Later verions of FreeBSD have getopt_long() */
244: #if defined(optional_argument) && defined(required_argument)
245: # define HAVE_GETOPT_LONG
246: #endif
247: #if !defined(__FreeBSD_kernel__)
248: # define HAVE_ARC4RANDOM
249: #endif
250: #define HAVE_SOCKADDR_SA_LEN
251:
252: #elif defined(__APPLE__)
253: #define HAVE_BSD_NETWORK
254: #define HAVE_GETOPT_LONG
255: #define HAVE_ARC4RANDOM
256: #define HAVE_SOCKADDR_SA_LEN
257: /* Define before sys/socket.h is included so we get socklen_t */
258: #define _BSD_SOCKLEN_T_
259:
260: #elif defined(__NetBSD__)
261: #define HAVE_BSD_NETWORK
262: #define HAVE_GETOPT_LONG
263: #undef HAVE_ARC4RANDOM
264: #define HAVE_SOCKADDR_SA_LEN
265:
266: #elif defined(__sun) || defined(__sun__)
267: #define HAVE_SOLARIS_NETWORK
268: #define HAVE_GETOPT_LONG
269: #undef HAVE_ARC4RANDOM
270: #undef HAVE_SOCKADDR_SA_LEN
271: #define ETHER_ADDR_LEN 6
272:
273: #endif
274:
275: /* Decide if we're going to support IPv6 */
276: /* We assume that systems which don't have IPv6
277: headers don't have ntop and pton either */
278:
279: #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY)
280: # define HAVE_IPV6
281: # define ADDRSTRLEN INET6_ADDRSTRLEN
282: #elif defined(INET_ADDRSTRLEN)
283: # undef HAVE_IPV6
284: # define ADDRSTRLEN INET_ADDRSTRLEN
285: #else
286: # undef HAVE_IPV6
287: # define ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
288: #endif
289:
290:
291: /* rules to implement compile-time option dependencies and
292: the NO_XXX flags */
293:
294: #ifdef NO_IPV6
295: #undef HAVE_IPV6
296: #endif
297:
298: #ifdef NO_TFTP
299: #undef HAVE_TFTP
300: #endif
301:
302: #ifdef NO_DHCP
303: #undef HAVE_DHCP
304: #undef HAVE_DHCP6
305: #endif
306:
307: #if defined(NO_DHCP6) || !defined(HAVE_IPV6)
308: #undef HAVE_DHCP6
309: #endif
310:
311: /* DHCP6 needs DHCP too */
312: #ifdef HAVE_DHCP6
313: #define HAVE_DHCP
314: #endif
315:
316: #if defined(NO_SCRIPT) || !defined(HAVE_DHCP) || defined(NO_FORK)
317: #undef HAVE_SCRIPT
318: #undef HAVE_LUASCRIPT
319: #endif
320:
321: /* Must HAVE_SCRIPT to HAVE_LUASCRIPT */
322: #ifdef HAVE_LUASCRIPT
323: #define HAVE_SCRIPT
324: #endif
325:
326: #ifdef NO_AUTH
327: #undef HAVE_AUTH
328: #endif
329:
330: #if defined(NO_IPSET) || !defined(HAVE_LINUX_NETWORK)
331: #undef HAVE_IPSET
332: #endif
333:
334: /* Define a string indicating which options are in use.
335: DNSMASQP_COMPILE_OPTS is only defined in dnsmasq.c */
336:
337: #ifdef DNSMASQ_COMPILE_OPTS
338:
339: static char *compile_opts =
340: #ifndef HAVE_IPV6
341: "no-"
342: #endif
343: "IPv6 "
344: #ifndef HAVE_GETOPT_LONG
345: "no-"
346: #endif
347: "GNU-getopt "
348: #ifdef HAVE_BROKEN_RTC
349: "no-RTC "
350: #endif
351: #ifdef NO_FORK
352: "no-MMU "
353: #endif
354: #ifndef HAVE_DBUS
355: "no-"
356: #endif
357: "DBus "
358: #ifndef LOCALEDIR
359: "no-"
360: #endif
361: "i18n "
362: #if !defined(LOCALEDIR) && !defined(HAVE_IDN)
363: "no-"
364: #endif
365: "IDN "
366: #ifndef HAVE_DHCP
367: "no-"
368: #endif
369: "DHCP "
370: #if defined(HAVE_DHCP)
371: # if !defined (HAVE_DHCP6)
372: "no-"
373: # endif
374: "DHCPv6 "
375: # if !defined(HAVE_SCRIPT)
376: "no-scripts "
377: # else
378: # if !defined(HAVE_LUASCRIPT)
379: "no-"
380: # endif
381: "Lua "
382: # endif
383: #endif
384: #ifndef HAVE_TFTP
385: "no-"
386: #endif
387: "TFTP "
388: #ifndef HAVE_CONNTRACK
389: "no-"
390: #endif
391: "conntrack "
392: #ifndef HAVE_IPSET
393: "no-"
394: #endif
395: "ipset "
396: #ifndef HAVE_AUTH
397: "no-"
398: #endif
399: "auth";
400:
401: #endif
402:
403:
404:
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