1: /* dnsmasq is Copyright (c) 2000-2014 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 40 /* choose to mininise fragmentation when storing DNSSEC keys */
22: #define DNSSEC_WORK 50 /* Max number of queries to validate one question */
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 50 /* most domain names are smaller than this */
35: #define CNAME_CHAIN 10 /* chains longer than this atr dropped for loop protection */
36: #define HOSTSFILE "/etc/hosts"
37: #define ETHERSFILE "/etc/ethers"
38: #define DEFLEASE 3600 /* default lease time, 1 hour */
39: #define CHUSER "nobody"
40: #define CHGRP "dip"
41: #define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
42: #define LOG_MAX 5 /* log-queue length */
43: #define RANDFILE "/dev/urandom"
44: #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq" /* Default - may be overridden by config */
45: #define DNSMASQ_PATH "/uk/org/thekelleys/dnsmasq"
46: #define AUTH_TTL 600 /* default TTL for auth DNS */
47: #define SOA_REFRESH 1200 /* SOA refresh default */
48: #define SOA_RETRY 180 /* SOA retry default */
49: #define SOA_EXPIRY 1209600 /* SOA expiry default */
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: /* Defining this builds a binary which handles time differently and works better on a system without a
130: stable RTC (it uses uptime, not epoch time) and writes the DHCP leases file less often to avoid flash wear.
131: */
132:
133: /* #define HAVE_BROKEN_RTC */
134:
135: /* The default set of options to build. Built with these options, dnsmasq
136: has no library dependencies other than libc */
137:
138: #define HAVE_DHCP
139: #define HAVE_DHCP6
140: #define HAVE_TFTP
141: #define HAVE_SCRIPT
142: #define HAVE_AUTH
143: #define HAVE_IPSET
144:
145: /* Build options which require external libraries.
146:
147: Defining HAVE_<opt>_STATIC as _well_ as HAVE_<opt> will link the library statically.
148:
149: You can use "make COPTS=-DHAVE_<opt>" instead of editing these.
150: */
151:
152: /* #define HAVE_LUASCRIPT */
153: /* #define HAVE_DBUS */
154: /* #define HAVE_IDN */
155: /* #define HAVE_CONNTRACK */
156: /* #define HAVE_DNSSEC */
157:
158:
159: /* Default locations for important system files. */
160:
161: #ifndef LEASEFILE
162: # if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
163: # define LEASEFILE "/var/db/dnsmasq.leases"
164: # elif defined(__sun__) || defined (__sun)
165: # define LEASEFILE "/var/cache/dnsmasq.leases"
166: # elif defined(__ANDROID__)
167: # define LEASEFILE "/data/misc/dhcp/dnsmasq.leases"
168: # else
169: # define LEASEFILE "/var/lib/misc/dnsmasq.leases"
170: # endif
171: #endif
172:
173: #ifndef CONFFILE
174: # if defined(__FreeBSD__)
175: # define CONFFILE "/usr/local/etc/dnsmasq.conf"
176: # else
177: # define CONFFILE "/etc/dnsmasq.conf"
178: # endif
179: #endif
180:
181: #ifndef RESOLVFILE
182: # if defined(__uClinux__)
183: # define RESOLVFILE "/etc/config/resolv.conf"
184: # else
185: # define RESOLVFILE "/etc/resolv.conf"
186: # endif
187: #endif
188:
189: #ifndef RUNFILE
190: # if defined(__ANDROID__)
191: # define RUNFILE "/data/dnsmasq.pid"
192: # else
193: # define RUNFILE "/var/run/dnsmasq.pid"
194: # endif
195: #endif
196:
197: /* platform dependent options: these are determined automatically below
198:
199: HAVE_LINUX_NETWORK
200: HAVE_BSD_NETWORK
201: HAVE_SOLARIS_NETWORK
202: define exactly one of these to alter interaction with kernel networking.
203:
204: HAVE_GETOPT_LONG
205: defined when GNU-style getopt_long available.
206:
207: HAVE_SOCKADDR_SA_LEN
208: defined if struct sockaddr has sa_len field (*BSD)
209: */
210:
211: /* Must preceed __linux__ since uClinux defines __linux__ too. */
212: #if defined(__uClinux__)
213: #define HAVE_LINUX_NETWORK
214: #define HAVE_GETOPT_LONG
215: #undef HAVE_SOCKADDR_SA_LEN
216: /* Never use fork() on uClinux. Note that this is subtly different from the
217: --keep-in-foreground option, since it also suppresses forking new
218: processes for TCP connections and disables the call-a-script on leasechange
219: system. It's intended for use on MMU-less kernels. */
220: #define NO_FORK
221:
222: #elif defined(__UCLIBC__)
223: #define HAVE_LINUX_NETWORK
224: #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
225: ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
226: # define HAVE_GETOPT_LONG
227: #endif
228: #undef HAVE_SOCKADDR_SA_LEN
229: #if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
230: # define NO_FORK
231: #endif
232: #if defined(__UCLIBC_HAS_IPV6__)
233: # ifndef IPV6_V6ONLY
234: # define IPV6_V6ONLY 26
235: # endif
236: #endif
237:
238: /* This is for glibc 2.x */
239: #elif defined(__linux__)
240: #define HAVE_LINUX_NETWORK
241: #define HAVE_GETOPT_LONG
242: #undef HAVE_SOCKADDR_SA_LEN
243:
244: #elif defined(__FreeBSD__) || \
245: defined(__OpenBSD__) || \
246: defined(__DragonFly__) || \
247: defined(__FreeBSD_kernel__)
248: #define HAVE_BSD_NETWORK
249: /* Later verions of FreeBSD have getopt_long() */
250: #if defined(optional_argument) && defined(required_argument)
251: # define HAVE_GETOPT_LONG
252: #endif
253: #define HAVE_SOCKADDR_SA_LEN
254:
255: #elif defined(__APPLE__)
256: #define HAVE_BSD_NETWORK
257: #define HAVE_GETOPT_LONG
258: #define HAVE_SOCKADDR_SA_LEN
259: /* Define before sys/socket.h is included so we get socklen_t */
260: #define _BSD_SOCKLEN_T_
261: /* Select the RFC_3542 version of the IPv6 socket API.
262: Define before netinet6/in6.h is included. */
263: #define __APPLE_USE_RFC_3542
264:
265: #elif defined(__NetBSD__)
266: #define HAVE_BSD_NETWORK
267: #define HAVE_GETOPT_LONG
268: #define HAVE_SOCKADDR_SA_LEN
269:
270: #elif defined(__sun) || defined(__sun__)
271: #define HAVE_SOLARIS_NETWORK
272: #define HAVE_GETOPT_LONG
273: #undef HAVE_SOCKADDR_SA_LEN
274: #define ETHER_ADDR_LEN 6
275:
276: #endif
277:
278: /* Decide if we're going to support IPv6 */
279: /* We assume that systems which don't have IPv6
280: headers don't have ntop and pton either */
281:
282: #if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY)
283: # define HAVE_IPV6
284: # define ADDRSTRLEN INET6_ADDRSTRLEN
285: #else
286: # if !defined(INET_ADDRSTRLEN)
287: # define INET_ADDRSTRLEN 16 /* 4*3 + 3 dots + NULL */
288: # endif
289: # undef HAVE_IPV6
290: # define ADDRSTRLEN INET_ADDRSTRLEN
291: #endif
292:
293:
294: /* rules to implement compile-time option dependencies and
295: the NO_XXX flags */
296:
297: #ifdef NO_IPV6
298: #undef HAVE_IPV6
299: #endif
300:
301: #ifdef NO_TFTP
302: #undef HAVE_TFTP
303: #endif
304:
305: #ifdef NO_DHCP
306: #undef HAVE_DHCP
307: #undef HAVE_DHCP6
308: #endif
309:
310: #if defined(NO_DHCP6) || !defined(HAVE_IPV6)
311: #undef HAVE_DHCP6
312: #endif
313:
314: /* DHCP6 needs DHCP too */
315: #ifdef HAVE_DHCP6
316: #define HAVE_DHCP
317: #endif
318:
319: #if defined(NO_SCRIPT) || !defined(HAVE_DHCP) || defined(NO_FORK)
320: #undef HAVE_SCRIPT
321: #undef HAVE_LUASCRIPT
322: #endif
323:
324: /* Must HAVE_SCRIPT to HAVE_LUASCRIPT */
325: #ifdef HAVE_LUASCRIPT
326: #define HAVE_SCRIPT
327: #endif
328:
329: #ifdef NO_AUTH
330: #undef HAVE_AUTH
331: #endif
332:
333: #if defined(NO_IPSET) || !defined(HAVE_LINUX_NETWORK)
334: #undef HAVE_IPSET
335: #endif
336:
337: /* Define a string indicating which options are in use.
338: DNSMASQP_COMPILE_OPTS is only defined in dnsmasq.c */
339:
340: #ifdef DNSMASQ_COMPILE_OPTS
341:
342: static char *compile_opts =
343: #ifndef HAVE_IPV6
344: "no-"
345: #endif
346: "IPv6 "
347: #ifndef HAVE_GETOPT_LONG
348: "no-"
349: #endif
350: "GNU-getopt "
351: #ifdef HAVE_BROKEN_RTC
352: "no-RTC "
353: #endif
354: #ifdef NO_FORK
355: "no-MMU "
356: #endif
357: #ifndef HAVE_DBUS
358: "no-"
359: #endif
360: "DBus "
361: #ifndef LOCALEDIR
362: "no-"
363: #endif
364: "i18n "
365: #if !defined(LOCALEDIR) && !defined(HAVE_IDN)
366: "no-"
367: #endif
368: "IDN "
369: #ifndef HAVE_DHCP
370: "no-"
371: #endif
372: "DHCP "
373: #if defined(HAVE_DHCP)
374: # if !defined (HAVE_DHCP6)
375: "no-"
376: # endif
377: "DHCPv6 "
378: # if !defined(HAVE_SCRIPT)
379: "no-scripts "
380: # else
381: # if !defined(HAVE_LUASCRIPT)
382: "no-"
383: # endif
384: "Lua "
385: # endif
386: #endif
387: #ifndef HAVE_TFTP
388: "no-"
389: #endif
390: "TFTP "
391: #ifndef HAVE_CONNTRACK
392: "no-"
393: #endif
394: "conntrack "
395: #ifndef HAVE_IPSET
396: "no-"
397: #endif
398: "ipset "
399: #ifndef HAVE_AUTH
400: "no-"
401: #endif
402: "auth "
403: #ifndef HAVE_DNSSEC
404: "no-"
405: #endif
406: "DNSSEC";
407:
408:
409: #endif
410:
411:
412:
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