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 COPYRIGHT "Copyright (c) 2000-2013 Simon Kelley"
18:
19: #ifndef NO_LARGEFILE
20: /* Ensure we can use files >2GB (log files may grow this big) */
21: # define _LARGEFILE_SOURCE 1
22: # define _FILE_OFFSET_BITS 64
23: #endif
24:
25: /* Get linux C library versions and define _GNU_SOURCE for kFreeBSD. */
26: #if defined(__linux__) || defined(__GLIBC__)
27: # ifndef __ANDROID__
28: # define _GNU_SOURCE
29: # endif
30: # include <features.h>
31: #endif
32:
33: /* Need these defined early */
34: #if defined(__sun) || defined(__sun__)
35: # define _XPG4_2
36: # define __EXTENSIONS__
37: #endif
38:
39: /* get these before config.h for IPv6 stuff... */
40: #include <sys/types.h>
41: #include <sys/socket.h>
42:
43: #ifdef __APPLE__
44: /* Define before netinet/in.h to select API. OSX Lion onwards. */
45: # define __APPLE_USE_RFC_3542
46: #endif
47: #include <netinet/in.h>
48:
49: /* Also needed before config.h. */
50: #include <getopt.h>
51:
52: #include "config.h"
53:
54: typedef unsigned char u8;
55: typedef unsigned short u16;
56: typedef unsigned int u32;
57: typedef unsigned long long u64;
58:
59: #include "dns-protocol.h"
60: #include "dhcp-protocol.h"
61: #ifdef HAVE_DHCP6
62: #include "dhcp6-protocol.h"
63: #include "radv-protocol.h"
64: #endif
65:
66: #define gettext_noop(S) (S)
67: #ifndef LOCALEDIR
68: # define _(S) (S)
69: #else
70: # include <libintl.h>
71: # include <locale.h>
72: # define _(S) gettext(S)
73: #endif
74:
75: #include <arpa/inet.h>
76: #include <sys/stat.h>
77: #include <sys/ioctl.h>
78: #if defined(HAVE_SOLARIS_NETWORK)
79: # include <sys/sockio.h>
80: #endif
81: #include <sys/select.h>
82: #include <sys/wait.h>
83: #include <sys/time.h>
84: #include <sys/un.h>
85: #include <limits.h>
86: #include <net/if.h>
87: #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu)
88: /* Some solaris net/if./h omit this. */
89: # define ifr_mtu ifr_ifru.ifru_metric
90: #endif
91: #include <unistd.h>
92: #include <stdio.h>
93: #include <string.h>
94: #include <stdlib.h>
95: #include <fcntl.h>
96: #include <ctype.h>
97: #include <signal.h>
98: #include <stddef.h>
99: #include <time.h>
100: #include <errno.h>
101: #include <pwd.h>
102: #include <grp.h>
103: #include <stdarg.h>
104: #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__)
105: # include <netinet/if_ether.h>
106: #else
107: # include <net/ethernet.h>
108: #endif
109: #include <net/if_arp.h>
110: #include <netinet/in_systm.h>
111: #include <netinet/ip.h>
112: #include <netinet/ip_icmp.h>
113: #include <sys/uio.h>
114: #include <syslog.h>
115: #include <dirent.h>
116: #ifndef HAVE_LINUX_NETWORK
117: # include <net/if_dl.h>
118: #endif
119:
120: #if defined(HAVE_LINUX_NETWORK)
121: #include <linux/capability.h>
122: /* There doesn't seem to be a universally-available
123: userpace header for these. */
124: extern int capset(cap_user_header_t header, cap_user_data_t data);
125: extern int capget(cap_user_header_t header, cap_user_data_t data);
126: #define LINUX_CAPABILITY_VERSION_1 0x19980330
127: #define LINUX_CAPABILITY_VERSION_2 0x20071026
128: #define LINUX_CAPABILITY_VERSION_3 0x20080522
129:
130: #include <sys/prctl.h>
131: #elif defined(HAVE_SOLARIS_NETWORK)
132: #include <priv.h>
133: #endif
134:
135: /* daemon is function in the C library.... */
136: #define daemon dnsmasq_daemon
137:
138: /* Async event queue */
139: struct event_desc {
140: int event, data, msg_sz;
141: };
142:
143: #define EVENT_RELOAD 1
144: #define EVENT_DUMP 2
145: #define EVENT_ALARM 3
146: #define EVENT_TERM 4
147: #define EVENT_CHILD 5
148: #define EVENT_REOPEN 6
149: #define EVENT_EXITED 7
150: #define EVENT_KILLED 8
151: #define EVENT_EXEC_ERR 9
152: #define EVENT_PIPE_ERR 10
153: #define EVENT_USER_ERR 11
154: #define EVENT_CAP_ERR 12
155: #define EVENT_PIDFILE 13
156: #define EVENT_HUSER_ERR 14
157: #define EVENT_GROUP_ERR 15
158: #define EVENT_DIE 16
159: #define EVENT_LOG_ERR 17
160: #define EVENT_FORK_ERR 18
161: #define EVENT_LUA_ERR 19
162: #define EVENT_TFTP_ERR 20
163:
164: /* Exit codes. */
165: #define EC_GOOD 0
166: #define EC_BADCONF 1
167: #define EC_BADNET 2
168: #define EC_FILE 3
169: #define EC_NOMEM 4
170: #define EC_MISC 5
171: #define EC_INIT_OFFSET 10
172:
173: /* Min buffer size: we check after adding each record, so there must be
174: memory for the largest packet, and the largest record so the
175: min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
176: This might be increased is EDNS packet size if greater than the minimum.
177: */
178: #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
179:
180: /* Trust the compiler dead-code eliminator.... */
181: #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
182:
183: #define OPT_BOGUSPRIV 0
184: #define OPT_FILTER 1
185: #define OPT_LOG 2
186: #define OPT_SELFMX 3
187: #define OPT_NO_HOSTS 4
188: #define OPT_NO_POLL 5
189: #define OPT_DEBUG 6
190: #define OPT_ORDER 7
191: #define OPT_NO_RESOLV 8
192: #define OPT_EXPAND 9
193: #define OPT_LOCALMX 10
194: #define OPT_NO_NEG 11
195: #define OPT_NODOTS_LOCAL 12
196: #define OPT_NOWILD 13
197: #define OPT_ETHERS 14
198: #define OPT_RESOLV_DOMAIN 15
199: #define OPT_NO_FORK 16
200: #define OPT_AUTHORITATIVE 17
201: #define OPT_LOCALISE 18
202: #define OPT_DBUS 19
203: #define OPT_DHCP_FQDN 20
204: #define OPT_NO_PING 21
205: #define OPT_LEASE_RO 22
206: #define OPT_ALL_SERVERS 23
207: #define OPT_RELOAD 24
208: #define OPT_LOCAL_REBIND 25
209: #define OPT_TFTP_SECURE 26
210: #define OPT_TFTP_NOBLOCK 27
211: #define OPT_LOG_OPTS 28
212: #define OPT_TFTP_APREF 29
213: #define OPT_NO_OVERRIDE 30
214: #define OPT_NO_REBIND 31
215: #define OPT_ADD_MAC 32
216: #define OPT_DNSSEC 33
217: #define OPT_CONSEC_ADDR 34
218: #define OPT_CONNTRACK 35
219: #define OPT_FQDN_UPDATE 36
220: #define OPT_RA 37
221: #define OPT_TFTP_LC 38
222: #define OPT_CLEVERBIND 39
223: #define OPT_TFTP 40
224: #define OPT_LAST 41
225:
226: /* extra flags for my_syslog, we use a couple of facilities since they are known
227: not to occupy the same bits as priorities, no matter how syslog.h is set up. */
228: #define MS_TFTP LOG_USER
229: #define MS_DHCP LOG_DAEMON
230:
231: struct all_addr {
232: union {
233: struct in_addr addr4;
234: #ifdef HAVE_IPV6
235: struct in6_addr addr6;
236: #endif
237: } addr;
238: };
239:
240: struct bogus_addr {
241: struct in_addr addr;
242: struct bogus_addr *next;
243: };
244:
245: /* dns doctor param */
246: struct doctor {
247: struct in_addr in, end, out, mask;
248: struct doctor *next;
249: };
250:
251: struct mx_srv_record {
252: char *name, *target;
253: int issrv, srvport, priority, weight;
254: unsigned int offset;
255: struct mx_srv_record *next;
256: };
257:
258: struct naptr {
259: char *name, *replace, *regexp, *services, *flags;
260: unsigned int order, pref;
261: struct naptr *next;
262: };
263:
264: struct txt_record {
265: char *name;
266: unsigned char *txt;
267: unsigned short class, len;
268: struct txt_record *next;
269: };
270:
271: struct ptr_record {
272: char *name, *ptr;
273: struct ptr_record *next;
274: };
275:
276: struct cname {
277: char *alias, *target;
278: struct cname *next;
279: };
280:
281: struct auth_zone {
282: char *domain;
283: struct subnet {
284: int is6, prefixlen;
285: struct in_addr addr4;
286: #ifdef HAVE_IPV6
287: struct in6_addr addr6;
288: #endif
289: struct subnet *next;
290: } *subnet;
291: struct auth_zone *next;
292: };
293:
294:
295: struct host_record {
296: struct name_list {
297: char *name;
298: struct name_list *next;
299: } *names;
300: struct in_addr addr;
301: #ifdef HAVE_IPV6
302: struct in6_addr addr6;
303: #endif
304: struct host_record *next;
305: };
306:
307: struct interface_name {
308: char *name; /* domain name */
309: char *intr; /* interface name */
310: struct interface_name *next;
311: };
312:
313: union bigname {
314: char name[MAXDNAME];
315: union bigname *next; /* freelist */
316: };
317:
318: struct keydata {
319: struct keydata *next;
320: unsigned char key[KEYBLOCK_LEN];
321: };
322:
323: struct crec {
324: struct crec *next, *prev, *hash_next;
325: /* union is 16 bytes when doing IPv6, 8 bytes on 32 bit machines without IPv6 */
326: union {
327: struct all_addr addr;
328: struct {
329: struct crec *cache;
330: int uid;
331: } cname;
332: struct {
333: struct keydata *keydata;
334: unsigned char algo;
335: unsigned char digest; /* DS only */
336: unsigned short flags_or_keyid; /* flags for DNSKEY, keyid for DS */
337: } key;
338: } addr;
339: time_t ttd; /* time to die */
340: /* used as keylen if F_DS or F_DNSKEY, index to source for F_HOSTS */
341: int uid;
342: unsigned short flags;
343: union {
344: char sname[SMALLDNAME];
345: union bigname *bname;
346: char *namep;
347: } name;
348: };
349:
350: #define F_IMMORTAL (1u<<0)
351: #define F_NAMEP (1u<<1)
352: #define F_REVERSE (1u<<2)
353: #define F_FORWARD (1u<<3)
354: #define F_DHCP (1u<<4)
355: #define F_NEG (1u<<5)
356: #define F_HOSTS (1u<<6)
357: #define F_IPV4 (1u<<7)
358: #define F_IPV6 (1u<<8)
359: #define F_BIGNAME (1u<<9)
360: #define F_NXDOMAIN (1u<<10)
361: #define F_CNAME (1u<<11)
362: #define F_DNSKEY (1u<<12)
363: #define F_CONFIG (1u<<13)
364: #define F_DS (1u<<14)
365: #define F_DNSSECOK (1u<<15)
366:
367: /* below here are only valid as args to log_query: cache
368: entries are limited to 16 bits */
369: #define F_UPSTREAM (1u<<16)
370: #define F_RRNAME (1u<<17)
371: #define F_SERVER (1u<<18)
372: #define F_QUERY (1u<<19)
373: #define F_NOERR (1u<<20)
374: #define F_AUTH (1u<<21)
375:
376: /* composites */
377: #define F_TYPE (F_IPV4 | F_IPV6 | F_DNSKEY | F_DS) /* Only one may be set */
378:
379:
380:
381: /* struct sockaddr is not large enough to hold any address,
382: and specifically not big enough to hold an IPv6 address.
383: Blech. Roll our own. */
384: union mysockaddr {
385: struct sockaddr sa;
386: struct sockaddr_in in;
387: #if defined(HAVE_IPV6)
388: struct sockaddr_in6 in6;
389: #endif
390: };
391:
392: /* bits in flag param to IPv6 callbacks from iface_enumerate() */
393: #define IFACE_TENTATIVE 1
394: #define IFACE_DEPRECATED 2
395:
396:
397: #define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */
398: #define SERV_NO_ADDR 2 /* no server, this domain is local only */
399: #define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */
400: #define SERV_HAS_DOMAIN 8 /* server for one domain only */
401: #define SERV_HAS_SOURCE 16 /* source address defined */
402: #define SERV_FOR_NODOTS 32 /* server for names with no domain part only */
403: #define SERV_WARNED_RECURSIVE 64 /* avoid warning spam */
404: #define SERV_FROM_DBUS 128 /* 1 if source is DBus */
405: #define SERV_MARK 256 /* for mark-and-delete */
406: #define SERV_TYPE (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
407: #define SERV_COUNTED 512 /* workspace for log code */
408: #define SERV_USE_RESOLV 1024 /* forward this domain in the normal way */
409: #define SERV_NO_REBIND 2048 /* inhibit dns-rebind protection */
410:
411: struct serverfd {
412: int fd;
413: union mysockaddr source_addr;
414: char interface[IF_NAMESIZE+1];
415: struct serverfd *next;
416: };
417:
418: struct randfd {
419: int fd;
420: unsigned short refcount, family;
421: };
422:
423: struct server {
424: union mysockaddr addr, source_addr;
425: char interface[IF_NAMESIZE+1];
426: struct serverfd *sfd;
427: char *domain; /* set if this server only handles a domain. */
428: int flags, tcpfd;
429: unsigned int queries, failed_queries;
430: struct server *next;
431: };
432:
433: struct ipsets {
434: char **sets;
435: char *domain;
436: struct ipsets *next;
437: };
438:
439: struct irec {
440: union mysockaddr addr;
441: struct in_addr netmask; /* only valid for IPv4 */
442: int tftp_ok, dhcp_ok, mtu, done, dad, dns_auth, index, multicast_done;
443: char *name;
444: struct irec *next;
445: };
446:
447: struct listener {
448: int fd, tcpfd, tftpfd, family;
449: struct irec *iface; /* only sometimes valid for non-wildcard */
450: struct listener *next;
451: };
452:
453: /* interface and address parms from command line. */
454: struct iname {
455: char *name;
456: union mysockaddr addr;
457: int used;
458: struct iname *next;
459: };
460:
461: /* resolv-file parms from command-line */
462: struct resolvc {
463: struct resolvc *next;
464: int is_default, logged;
465: time_t mtime;
466: char *name;
467: };
468:
469: /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile */
470: #define AH_DIR 1
471: #define AH_INACTIVE 2
472: struct hostsfile {
473: struct hostsfile *next;
474: int flags;
475: char *fname;
476: int index; /* matches to cache entries for logging */
477: };
478:
479: #define FREC_NOREBIND 1
480: #define FREC_CHECKING_DISABLED 2
481:
482: struct frec {
483: union mysockaddr source;
484: struct all_addr dest;
485: struct server *sentto; /* NULL means free */
486: struct randfd *rfd4;
487: #ifdef HAVE_IPV6
488: struct randfd *rfd6;
489: #endif
490: unsigned int iface;
491: unsigned short orig_id, new_id;
492: int fd, forwardall, flags;
493: unsigned int crc;
494: time_t time;
495: struct frec *next;
496: };
497:
498: /* flags in top of length field for DHCP-option tables */
499: #define OT_ADDR_LIST 0x8000
500: #define OT_RFC1035_NAME 0x4000
501: #define OT_INTERNAL 0x2000
502: #define OT_NAME 0x1000
503: #define OT_CSTRING 0x0800
504: #define OT_DEC 0x0400
505: #define OT_TIME 0x0200
506:
507: /* actions in the daemon->helper RPC */
508: #define ACTION_DEL 1
509: #define ACTION_OLD_HOSTNAME 2
510: #define ACTION_OLD 3
511: #define ACTION_ADD 4
512: #define ACTION_TFTP 5
513:
514: #define LEASE_NEW 1 /* newly created */
515: #define LEASE_CHANGED 2 /* modified */
516: #define LEASE_AUX_CHANGED 4 /* CLID or expiry changed */
517: #define LEASE_AUTH_NAME 8 /* hostname came from config, not from client */
518: #define LEASE_USED 16 /* used this DHCPv6 transaction */
519: #define LEASE_NA 32 /* IPv6 no-temporary lease */
520: #define LEASE_TA 64 /* IPv6 temporary lease */
521: #define LEASE_HAVE_HWADDR 128 /* Have set hwaddress */
522:
523: struct dhcp_lease {
524: int clid_len; /* length of client identifier */
525: unsigned char *clid; /* clientid */
526: char *hostname, *fqdn; /* name from client-hostname option or config */
527: char *old_hostname; /* hostname before it moved to another lease */
528: int flags;
529: time_t expires; /* lease expiry */
530: #ifdef HAVE_BROKEN_RTC
531: unsigned int length;
532: #endif
533: int hwaddr_len, hwaddr_type; /* hw_type used for iaid in v6 */
534: unsigned char hwaddr[DHCP_CHADDR_MAX]; /* also IPv6 address */
535: struct in_addr addr, override, giaddr;
536: unsigned char *extradata;
537: unsigned int extradata_len, extradata_size;
538: int last_interface;
539: #ifdef HAVE_DHCP6
540: struct slaac_address {
541: struct in6_addr addr, local;
542: time_t ping_time;
543: int backoff; /* zero -> confirmed */
544: struct slaac_address *next;
545: } *slaac_address;
546: int vendorclass_count;
547: #endif
548: struct dhcp_lease *next;
549: };
550:
551: struct dhcp_netid {
552: char *net;
553: struct dhcp_netid *next;
554: };
555:
556: struct dhcp_netid_list {
557: struct dhcp_netid *list;
558: struct dhcp_netid_list *next;
559: };
560:
561: struct tag_if {
562: struct dhcp_netid_list *set;
563: struct dhcp_netid *tag;
564: struct tag_if *next;
565: };
566:
567: struct hwaddr_config {
568: int hwaddr_len, hwaddr_type;
569: unsigned char hwaddr[DHCP_CHADDR_MAX];
570: unsigned int wildcard_mask;
571: struct hwaddr_config *next;
572: };
573:
574: struct dhcp_config {
575: unsigned int flags;
576: int clid_len; /* length of client identifier */
577: unsigned char *clid; /* clientid */
578: char *hostname, *domain;
579: struct dhcp_netid_list *netid;
580: #ifdef HAVE_DHCP6
581: struct in6_addr addr6;
582: #endif
583: struct in_addr addr;
584: time_t decline_time;
585: unsigned int lease_time;
586: struct hwaddr_config *hwaddr;
587: struct dhcp_config *next;
588: };
589:
590: #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
591:
592: #define CONFIG_DISABLE 1
593: #define CONFIG_CLID 2
594: #define CONFIG_TIME 8
595: #define CONFIG_NAME 16
596: #define CONFIG_ADDR 32
597: #define CONFIG_NOCLID 128
598: #define CONFIG_FROM_ETHERS 256 /* entry created by /etc/ethers */
599: #define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */
600: #define CONFIG_DECLINED 1024 /* address declined by client */
601: #define CONFIG_BANK 2048 /* from dhcp hosts file */
602: #define CONFIG_ADDR6 4096
603: #define CONFIG_WILDCARD 8192
604:
605: struct dhcp_opt {
606: int opt, len, flags;
607: union {
608: int encap;
609: unsigned int wildcard_mask;
610: unsigned char *vendor_class;
611: } u;
612: unsigned char *val;
613: struct dhcp_netid *netid;
614: struct dhcp_opt *next;
615: };
616:
617: #define DHOPT_ADDR 1
618: #define DHOPT_STRING 2
619: #define DHOPT_ENCAPSULATE 4
620: #define DHOPT_ENCAP_MATCH 8
621: #define DHOPT_FORCE 16
622: #define DHOPT_BANK 32
623: #define DHOPT_ENCAP_DONE 64
624: #define DHOPT_MATCH 128
625: #define DHOPT_VENDOR 256
626: #define DHOPT_HEX 512
627: #define DHOPT_VENDOR_MATCH 1024
628: #define DHOPT_RFC3925 2048
629: #define DHOPT_TAGOK 4096
630: #define DHOPT_ADDR6 8192
631:
632: struct dhcp_boot {
633: char *file, *sname, *tftp_sname;
634: struct in_addr next_server;
635: struct dhcp_netid *netid;
636: struct dhcp_boot *next;
637: };
638:
639: struct pxe_service {
640: unsigned short CSA, type;
641: char *menu, *basename, *sname;
642: struct in_addr server;
643: struct dhcp_netid *netid;
644: struct pxe_service *next;
645: };
646:
647: #define MATCH_VENDOR 1
648: #define MATCH_USER 2
649: #define MATCH_CIRCUIT 3
650: #define MATCH_REMOTE 4
651: #define MATCH_SUBSCRIBER 5
652:
653: /* vendorclass, userclass, remote-id or cicuit-id */
654: struct dhcp_vendor {
655: int len, match_type;
656: unsigned int enterprise;
657: char *data;
658: struct dhcp_netid netid;
659: struct dhcp_vendor *next;
660: };
661:
662: struct dhcp_mac {
663: unsigned int mask;
664: int hwaddr_len, hwaddr_type;
665: unsigned char hwaddr[DHCP_CHADDR_MAX];
666: struct dhcp_netid netid;
667: struct dhcp_mac *next;
668: };
669:
670: struct dhcp_bridge {
671: char iface[IF_NAMESIZE];
672: struct dhcp_bridge *alias, *next;
673: };
674:
675: struct cond_domain {
676: char *domain;
677: struct in_addr start, end;
678: #ifdef HAVE_IPV6
679: struct in6_addr start6, end6;
680: #endif
681: int is6;
682: struct cond_domain *next;
683: };
684:
685: #ifdef OPTION6_PREFIX_CLASS
686: struct prefix_class {
687: int class;
688: struct dhcp_netid tag;
689: struct prefix_class *next;
690: };
691: #endif
692:
693: struct dhcp_context {
694: unsigned int lease_time, addr_epoch;
695: struct in_addr netmask, broadcast;
696: struct in_addr local, router;
697: struct in_addr start, end; /* range of available addresses */
698: #ifdef HAVE_DHCP6
699: struct in6_addr start6, end6; /* range of available addresses */
700: struct in6_addr local6;
701: int prefix, if_index;
702: unsigned int valid, preferred;
703: time_t ra_time, ra_short_period_start;
704: char *template_interface;
705: #endif
706: int flags;
707: struct dhcp_netid netid, *filter;
708: struct dhcp_context *next, *current;
709: };
710:
711: #define CONTEXT_STATIC 1
712: #define CONTEXT_NETMASK 2
713: #define CONTEXT_BRDCAST 4
714: #define CONTEXT_PROXY 8
715: #define CONTEXT_RA_ONLY 16
716: #define CONTEXT_RA_DONE 32
717: #define CONTEXT_RA_NAME 64
718: #define CONTEXT_RA_STATELESS 128
719: #define CONTEXT_DHCP 256
720: #define CONTEXT_DEPRECATE 512
721: #define CONTEXT_TEMPLATE 1024 /* create contexts using addresses */
722: #define CONTEXT_CONSTRUCTED 2048
723: #define CONTEXT_GC 4096
724: #define CONTEXT_RA 8192
725: #define CONTEXT_CONF_USED 16384
726: #define CONTEXT_USED 32768
727:
728: struct ping_result {
729: struct in_addr addr;
730: time_t time;
731: unsigned int hash;
732: struct ping_result *next;
733: };
734:
735: struct tftp_file {
736: int refcount, fd;
737: off_t size;
738: dev_t dev;
739: ino_t inode;
740: char filename[];
741: };
742:
743: struct tftp_transfer {
744: int sockfd;
745: time_t timeout;
746: int backoff;
747: unsigned int block, blocksize, expansion;
748: off_t offset;
749: union mysockaddr peer;
750: char opt_blocksize, opt_transize, netascii, carrylf;
751: struct tftp_file *file;
752: struct tftp_transfer *next;
753: };
754:
755: struct addr_list {
756: struct in_addr addr;
757: struct addr_list *next;
758: };
759:
760: struct tftp_prefix {
761: char *interface;
762: char *prefix;
763: struct tftp_prefix *next;
764: };
765:
766:
767: extern struct daemon {
768: /* datastuctures representing the command-line and
769: config file arguments. All set (including defaults)
770: in option.c */
771:
772: unsigned int options, options2;
773: struct resolvc default_resolv, *resolv_files;
774: time_t last_resolv;
775: struct mx_srv_record *mxnames;
776: struct naptr *naptr;
777: struct txt_record *txt, *rr;
778: struct ptr_record *ptr;
779: struct host_record *host_records, *host_records_tail;
780: struct cname *cnames;
781: struct auth_zone *auth_zones;
782: struct interface_name *int_names;
783: char *mxtarget;
784: char *lease_file;
785: char *username, *groupname, *scriptuser;
786: char *luascript;
787: char *authserver, *hostmaster;
788: struct iname *authinterface;
789: struct name_list *secondary_forward_server;
790: int group_set, osport;
791: char *domain_suffix;
792: struct cond_domain *cond_domain;
793: char *runfile;
794: char *lease_change_command;
795: struct iname *if_names, *if_addrs, *if_except, *dhcp_except, *auth_peers;
796: struct bogus_addr *bogus_addr;
797: struct server *servers;
798: struct ipsets *ipsets;
799: int log_fac; /* log facility */
800: char *log_file; /* optional log file */
801: int max_logs; /* queue limit */
802: int cachesize, ftabsize;
803: int port, query_port, min_port;
804: unsigned long local_ttl, neg_ttl, max_ttl, max_cache_ttl, auth_ttl;
805: struct hostsfile *addn_hosts;
806: struct dhcp_context *dhcp, *dhcp6;
807: struct dhcp_config *dhcp_conf;
808: struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
809: struct dhcp_vendor *dhcp_vendors;
810: struct dhcp_mac *dhcp_macs;
811: struct dhcp_boot *boot_config;
812: struct pxe_service *pxe_services;
813: struct tag_if *tag_if;
814: struct addr_list *override_relays;
815: int override;
816: int enable_pxe;
817: int doing_ra, doing_dhcp6;
818: struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
819: struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
820: struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
821: int dhcp_max, tftp_max;
822: int dhcp_server_port, dhcp_client_port;
823: int start_tftp_port, end_tftp_port;
824: unsigned int min_leasetime;
825: struct doctor *doctors;
826: unsigned short edns_pktsz;
827: char *tftp_prefix;
828: struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
829: unsigned int duid_enterprise, duid_config_len;
830: unsigned char *duid_config;
831: char *dbus_name;
832: unsigned long soa_sn, soa_refresh, soa_retry, soa_expiry;
833: #ifdef OPTION6_PREFIX_CLASS
834: struct prefix_class *prefix_classes;
835: #endif
836:
837: /* globally used stuff for DNS */
838: char *packet; /* packet buffer */
839: int packet_buff_sz; /* size of above */
840: char *namebuff; /* MAXDNAME size buffer */
841: unsigned int local_answer, queries_forwarded;
842: struct frec *frec_list;
843: struct serverfd *sfds;
844: struct irec *interfaces;
845: struct listener *listeners;
846: struct server *last_server;
847: time_t forwardtime;
848: int forwardcount;
849: struct server *srv_save; /* Used for resend on DoD */
850: size_t packet_len; /* " " */
851: struct randfd *rfd_save; /* " " */
852: pid_t tcp_pids[MAX_PROCS];
853: struct randfd randomsocks[RANDOM_SOCKS];
854: int v6pktinfo;
855:
856: /* DHCP state */
857: int dhcpfd, helperfd, pxefd;
858: #if defined(HAVE_LINUX_NETWORK)
859: int netlinkfd;
860: #elif defined(HAVE_BSD_NETWORK)
861: int dhcp_raw_fd, dhcp_icmp_fd;
862: #endif
863: struct iovec dhcp_packet;
864: char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
865: struct ping_result *ping_results;
866: FILE *lease_stream;
867: struct dhcp_bridge *bridges;
868: #ifdef HAVE_DHCP6
869: int duid_len;
870: unsigned char *duid;
871: struct iovec outpacket;
872: int dhcp6fd, icmp6fd;
873: #endif
874: /* DBus stuff */
875: /* void * here to avoid depending on dbus headers outside dbus.c */
876: void *dbus;
877: #ifdef HAVE_DBUS
878: struct watch *watches;
879: #endif
880:
881: /* TFTP stuff */
882: struct tftp_transfer *tftp_trans, *tftp_done_trans;
883:
884: /* utility string buffer, hold max sized IP address as string */
885: char *addrbuff;
886:
887: } *daemon;
888:
889: /* cache.c */
890: void cache_init(void);
891: void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
892: char *record_source(int index);
893: void querystr(char *desc, char *str, unsigned short type);
894: struct crec *cache_find_by_addr(struct crec *crecp,
895: struct all_addr *addr, time_t now,
896: unsigned short prot);
897: struct crec *cache_find_by_name(struct crec *crecp,
898: char *name, time_t now, unsigned short prot);
899: void cache_end_insert(void);
900: void cache_start_insert(void);
901: struct crec *cache_insert(char *name, struct all_addr *addr,
902: time_t now, unsigned long ttl, unsigned short flags);
903: void cache_reload(void);
904: void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
905: struct in_addr a_record_from_hosts(char *name, time_t now);
906: void cache_unhash_dhcp(void);
907: void dump_cache(time_t now);
908: char *cache_get_name(struct crec *crecp);
909: struct crec *cache_enumerate(int init);
910: char *get_domain(struct in_addr addr);
911: #ifdef HAVE_IPV6
912: char *get_domain6(struct in6_addr *addr);
913: #endif
914: #ifdef HAVE_DNSSEC
915: struct keydata *keydata_alloc(char *data, size_t len);
916: void keydata_free(struct keydata *blocks);
917: #endif
918:
919: /* rfc1035.c */
920: unsigned int extract_request(struct dns_header *header, size_t qlen,
921: char *name, unsigned short *typep);
922: size_t setup_reply(struct dns_header *header, size_t qlen,
923: struct all_addr *addrp, unsigned int flags,
924: unsigned long local_ttl);
925: int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff,
926: time_t now, char **ipsets, int is_sign, int checkrebind,
927: int checking_disabled);
928: size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
929: struct in_addr local_addr, struct in_addr local_netmask, time_t now);
930: int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
931: struct bogus_addr *addr, time_t now);
932: unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
933: size_t *len, unsigned char **p, int *is_sign);
934: int check_for_local_domain(char *name, time_t now);
935: unsigned int questions_crc(struct dns_header *header, size_t plen, char *buff);
936: size_t resize_packet(struct dns_header *header, size_t plen,
937: unsigned char *pheader, size_t hlen);
938: size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
939: int add_resource_record(struct dns_header *header, char *limit, int *truncp,
940: int nameoffset, unsigned char **pp, unsigned long ttl,
941: int *offset, unsigned short type, unsigned short class, char *format, ...);
942: unsigned char *skip_questions(struct dns_header *header, size_t plen);
943: int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
944: char *name, int isExtract, int extrabytes);
945: int in_arpa_name_2_addr(char *namein, struct all_addr *addrp);
946:
947: /* auth.c */
948: #ifdef HAVE_AUTH
949: size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t now, union mysockaddr *peer_addr);
950: #endif
951:
952: /* util.c */
953: void rand_init(void);
954: unsigned short rand16(void);
955: int legal_hostname(char *c);
956: char *canonicalise(char *s, int *nomem);
957: unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
958: void *safe_malloc(size_t size);
959: void safe_pipe(int *fd, int read_noblock);
960: void *whine_malloc(size_t size);
961: int sa_len(union mysockaddr *addr);
962: int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
963: int hostname_isequal(const char *a, const char *b);
964: time_t dnsmasq_time(void);
965: int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
966: #ifdef HAVE_IPV6
967: int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
968: u64 addr6part(struct in6_addr *addr);
969: void setaddr6part(struct in6_addr *addr, u64 host);
970: #endif
971: int retry_send(void);
972: void prettyprint_time(char *buf, unsigned int t);
973: int prettyprint_addr(union mysockaddr *addr, char *buf);
974: int parse_hex(char *in, unsigned char *out, int maxlen,
975: unsigned int *wildcard_mask, int *mac_type);
976: int memcmp_masked(unsigned char *a, unsigned char *b, int len,
977: unsigned int mask);
978: int expand_buf(struct iovec *iov, size_t size);
979: char *print_mac(char *buff, unsigned char *mac, int len);
980: void bump_maxfd(int fd, int *max);
981: int read_write(int fd, unsigned char *packet, int size, int rw);
982:
983: int wildcard_match(const char* wildcard, const char* match);
984:
985: /* log.c */
986: void die(char *message, char *arg1, int exit_code);
987: int log_start(struct passwd *ent_pw, int errfd);
988: int log_reopen(char *log_file);
989: void my_syslog(int priority, const char *format, ...);
990: void set_log_writer(fd_set *set, int *maxfdp);
991: void check_log_writer(fd_set *set);
992: void flush_log(void);
993:
994: /* option.c */
995: void read_opts (int argc, char **argv, char *compile_opts);
996: char *option_string(int prot, unsigned int opt, unsigned char *val,
997: int opt_len, char *buf, int buf_len);
998: void reread_dhcp(void);
999: void set_option_bool(unsigned int opt);
1000: void reset_option_bool(unsigned int opt);
1001: struct hostsfile *expand_filelist(struct hostsfile *list);
1002: char *parse_server(char *arg, union mysockaddr *addr,
1003: union mysockaddr *source_addr, char *interface, int *flags);
1004:
1005: /* forward.c */
1006: void reply_query(int fd, int family, time_t now);
1007: void receive_query(struct listener *listen, time_t now);
1008: unsigned char *tcp_request(int confd, time_t now,
1009: union mysockaddr *local_addr, struct in_addr netmask, int auth_dns);
1010: void server_gone(struct server *server);
1011: struct frec *get_new_frec(time_t now, int *wait);
1012: int send_from(int fd, int nowild, char *packet, size_t len,
1013: union mysockaddr *to, struct all_addr *source,
1014: unsigned int iface);
1015:
1016: /* network.c */
1017: int indextoname(int fd, int index, char *name);
1018: int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
1019: int random_sock(int family);
1020: void pre_allocate_sfds(void);
1021: int reload_servers(char *fname);
1022: void check_servers(void);
1023: int enumerate_interfaces();
1024: void create_wildcard_listeners(void);
1025: void create_bound_listeners(int die);
1026: int is_dad_listeners(void);
1027: int iface_check(int family, struct all_addr *addr, char *name, int *auth_dns);
1028: int loopback_exception(int fd, int family, struct all_addr *addr, char *name);
1029: int fix_fd(int fd);
1030: int tcp_interface(int fd, int af);
1031: struct in_addr get_ifaddr(char *intr);
1032: #ifdef HAVE_IPV6
1033: int set_ipv6pktinfo(int fd);
1034: #endif
1035: #ifdef HAVE_DHCP6
1036: void join_multicast(int dienow);
1037: #endif
1038:
1039: /* dhcp.c */
1040: #ifdef HAVE_DHCP
1041: void dhcp_init(void);
1042: void dhcp_packet(time_t now, int pxe_fd);
1043: struct dhcp_context *address_available(struct dhcp_context *context,
1044: struct in_addr addr,
1045: struct dhcp_netid *netids);
1046: struct dhcp_context *narrow_context(struct dhcp_context *context,
1047: struct in_addr taddr,
1048: struct dhcp_netid *netids);
1049: int address_allocate(struct dhcp_context *context,
1050: struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
1051: struct dhcp_netid *netids, time_t now);
1052: int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
1053: struct dhcp_config *find_config(struct dhcp_config *configs,
1054: struct dhcp_context *context,
1055: unsigned char *clid, int clid_len,
1056: unsigned char *hwaddr, int hw_len,
1057: int hw_type, char *hostname);
1058: void dhcp_read_ethers(void);
1059: struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
1060: char *host_from_dns(struct in_addr addr);
1061: #endif
1062:
1063: /* lease.c */
1064: #ifdef HAVE_DHCP
1065: void lease_update_file(time_t now);
1066: void lease_update_dns(int force);
1067: void lease_init(time_t now);
1068: struct dhcp_lease *lease4_allocate(struct in_addr addr);
1069: #ifdef HAVE_DHCP6
1070: struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
1071: struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
1072: int lease_type, int iaid, struct in6_addr *addr);
1073: void lease6_reset(void);
1074: struct dhcp_lease *lease6_find_by_client(struct dhcp_lease *first, int lease_type, unsigned char *clid, int clid_len, int iaid);
1075: struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
1076: u64 lease_find_max_addr6(struct dhcp_context *context);
1077: void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
1078: void lease_update_slaac(time_t now);
1079: #endif
1080: void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
1081: unsigned char *clid, int hw_len, int hw_type, int clid_len, time_t now, int force);
1082: void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth, char *domain, char *config_domain);
1083: void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
1084: void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now);
1085: struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
1086: unsigned char *clid, int clid_len);
1087: struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
1088: struct in_addr lease_find_max_addr(struct dhcp_context *context);
1089: void lease_prune(struct dhcp_lease *target, time_t now);
1090: void lease_update_from_configs(void);
1091: int do_script_run(time_t now);
1092: void rerun_scripts(void);
1093: void lease_find_interfaces(time_t now);
1094: #ifdef HAVE_SCRIPT
1095: void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
1096: unsigned int len, int delim);
1097: #endif
1098: #endif
1099:
1100: /* rfc2131.c */
1101: #ifdef HAVE_DHCP
1102: size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
1103: size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd, struct in_addr fallback);
1104: unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
1105: int clid_len, unsigned char *clid, int *len_out);
1106: #endif
1107:
1108: /* dnsmasq.c */
1109: #ifdef HAVE_DHCP
1110: int make_icmp_sock(void);
1111: int icmp_ping(struct in_addr addr);
1112: #endif
1113: void send_alarm(time_t event, time_t now);
1114: void send_event(int fd, int event, int data, char *msg);
1115: void clear_cache_and_reload(time_t now);
1116: void poll_resolv(int force, int do_reload, time_t now);
1117:
1118: /* netlink.c */
1119: #ifdef HAVE_LINUX_NETWORK
1120: void netlink_init(void);
1121: void netlink_multicast(time_t now);
1122: #endif
1123:
1124: /* bpf.c */
1125: #ifdef HAVE_BSD_NETWORK
1126: void init_bpf(void);
1127: void send_via_bpf(struct dhcp_packet *mess, size_t len,
1128: struct in_addr iface_addr, struct ifreq *ifr);
1129: #endif
1130:
1131: /* bpf.c or netlink.c */
1132: int iface_enumerate(int family, void *parm, int (callback)());
1133:
1134: /* dbus.c */
1135: #ifdef HAVE_DBUS
1136: char *dbus_init(void);
1137: void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
1138: void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
1139: # ifdef HAVE_DHCP
1140: void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
1141: # endif
1142: #endif
1143:
1144: /* ipset.c */
1145: #ifdef HAVE_IPSET
1146: void ipset_init(void);
1147: int add_to_ipset(const char *setname, const struct all_addr *ipaddr, int flags, int remove);
1148: #endif
1149:
1150: /* helper.c */
1151: #if defined(HAVE_SCRIPT)
1152: int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
1153: void helper_write(void);
1154: void queue_script(int action, struct dhcp_lease *lease,
1155: char *hostname, time_t now);
1156: #ifdef HAVE_TFTP
1157: void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer);
1158: #endif
1159: int helper_buf_empty(void);
1160: #endif
1161:
1162: /* tftp.c */
1163: #ifdef HAVE_TFTP
1164: void tftp_request(struct listener *listen, time_t now);
1165: void check_tftp_listeners(fd_set *rset, time_t now);
1166: int do_tftp_script_run(void);
1167: #endif
1168:
1169: /* conntrack.c */
1170: #ifdef HAVE_CONNTRACK
1171: int get_incoming_mark(union mysockaddr *peer_addr, struct all_addr *local_addr,
1172: int istcp, unsigned int *markp);
1173: #endif
1174:
1175: /* dhcp6.c */
1176: #ifdef HAVE_DHCP6
1177: void dhcp6_init(void);
1178: void dhcp6_packet(time_t now);
1179: struct dhcp_context *address6_allocate(struct dhcp_context *context, unsigned char *clid, int clid_len,
1180: int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans);
1181: int config_valid(struct dhcp_config *config, struct dhcp_context *context, struct in6_addr *addr);
1182: struct dhcp_context *address6_available(struct dhcp_context *context,
1183: struct in6_addr *taddr,
1184: struct dhcp_netid *netids,
1185: int plain_range);
1186: struct dhcp_context *address6_valid(struct dhcp_context *context,
1187: struct in6_addr *taddr,
1188: struct dhcp_netid *netids,
1189: int plain_range);
1190: struct dhcp_config *find_config6(struct dhcp_config *configs,
1191: struct dhcp_context *context,
1192: unsigned char *duid, int duid_len,
1193: char *hostname);
1194: struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1195: int prefix, u64 addr);
1196: void make_duid(time_t now);
1197: void dhcp_construct_contexts(time_t now);
1198: #endif
1199:
1200: /* rfc3315.c */
1201: #ifdef HAVE_DHCP6
1202: unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1203: struct in6_addr *fallback, size_t sz, int is_multicast, time_t now);
1204: #endif
1205:
1206: /* dhcp-common.c */
1207: #ifdef HAVE_DHCP
1208: void dhcp_common_init(void);
1209: ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1210: struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
1211: struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1212: struct dhcp_opt *opts);
1213: int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
1214: char *strip_hostname(char *hostname);
1215: void log_tags(struct dhcp_netid *netid, u32 xid);
1216: int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1217: void dhcp_update_configs(struct dhcp_config *configs);
1218: void display_opts(void);
1219: u16 lookup_dhcp_opt(int prot, char *name);
1220: u16 lookup_dhcp_len(int prot, u16 val);
1221: char *option_string(int prot, unsigned int opt, unsigned char *val,
1222: int opt_len, char *buf, int buf_len);
1223: #ifdef HAVE_LINUX_NETWORK
1224: void bindtodevice(int fd);
1225: #endif
1226: # ifdef HAVE_DHCP6
1227: void display_opts6(void);
1228: # endif
1229: void log_context(int family, struct dhcp_context *context);
1230: #endif
1231:
1232: /* outpacket.c */
1233: #ifdef HAVE_DHCP6
1234: void end_opt6(int container);
1235: int save_counter(int newval);
1236: void *expand(size_t headroom);
1237: int new_opt6(int opt);
1238: void *put_opt6(void *data, size_t len);
1239: void put_opt6_long(unsigned int val);
1240: void put_opt6_short(unsigned int val);
1241: void put_opt6_char(unsigned int val);
1242: void put_opt6_string(char *s);
1243: #endif
1244:
1245: /* radv.c */
1246: #ifdef HAVE_DHCP6
1247: void ra_init(time_t now);
1248: void icmp6_packet(time_t now);
1249: time_t periodic_ra(time_t now);
1250: void ra_start_unsolicted(time_t now, struct dhcp_context *context);
1251: #endif
1252:
1253: /* slaac.c */
1254: #ifdef HAVE_DHCP6
1255: void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force);
1256: time_t periodic_slaac(time_t now, struct dhcp_lease *leases);
1257: void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases);
1258: #endif
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