1: /* dnsmasq is Copyright (c) 2000-2021 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) 2000-2021 Simon Kelley"
18:
19: /* We do defines that influence behavior of stdio.h, so complain
20: if included too early. */
21: #ifdef _STDIO_H
22: # error "Header file stdio.h included too early!"
23: #endif
24:
25: #ifndef NO_LARGEFILE
26: /* Ensure we can use files >2GB (log files may grow this big) */
27: # define _LARGEFILE_SOURCE 1
28: # define _FILE_OFFSET_BITS 64
29: #endif
30:
31: /* Get linux C library versions and define _GNU_SOURCE for kFreeBSD. */
32: #if defined(__linux__) || defined(__GLIBC__)
33: # ifndef __ANDROID__
34: # define _GNU_SOURCE
35: # endif
36: # include <features.h>
37: #endif
38:
39: /* Need these defined early */
40: #if defined(__sun) || defined(__sun__)
41: # define _XPG4_2
42: # define __EXTENSIONS__
43: #endif
44:
45: #if (defined(__GNUC__) && __GNUC__ >= 3) || defined(__clang__)
46: #define ATTRIBUTE_NORETURN __attribute__ ((noreturn))
47: #else
48: #define ATTRIBUTE_NORETURN
49: #endif
50:
51: /* get these before config.h for IPv6 stuff... */
52: #include <sys/types.h>
53: #include <sys/socket.h>
54:
55: #ifdef __APPLE__
56: /* Define before netinet/in.h to select API. OSX Lion onwards. */
57: # define __APPLE_USE_RFC_3542
58: #endif
59: #include <netinet/in.h>
60:
61: /* Also needed before config.h. */
62: #include <getopt.h>
63:
64: #include "config.h"
65: #include "ip6addr.h"
66: #include "metrics.h"
67:
68: typedef unsigned char u8;
69: typedef unsigned short u16;
70: typedef unsigned int u32;
71: typedef unsigned long long u64;
72:
73: #define countof(x) (long)(sizeof(x) / sizeof(x[0]))
74: #define MIN(a,b) ((a) < (b) ? (a) : (b))
75:
76: #include "dns-protocol.h"
77: #include "dhcp-protocol.h"
78: #ifdef HAVE_DHCP6
79: #include "dhcp6-protocol.h"
80: #include "radv-protocol.h"
81: #endif
82:
83: #define gettext_noop(S) (S)
84: #ifndef LOCALEDIR
85: # define _(S) (S)
86: #else
87: # include <libintl.h>
88: # include <locale.h>
89: # define _(S) gettext(S)
90: #endif
91:
92: #include <arpa/inet.h>
93: #include <sys/stat.h>
94: #include <sys/ioctl.h>
95: #if defined(HAVE_SOLARIS_NETWORK)
96: # include <sys/sockio.h>
97: #endif
98: #if defined(HAVE_POLL_H)
99: # include <poll.h>
100: #else
101: # include <sys/poll.h>
102: #endif
103: #include <sys/wait.h>
104: #include <sys/time.h>
105: #include <sys/un.h>
106: #include <limits.h>
107: #include <net/if.h>
108: #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu)
109: /* Some solaris net/if./h omit this. */
110: # define ifr_mtu ifr_ifru.ifru_metric
111: #endif
112: #include <unistd.h>
113: #include <stdio.h>
114: #include <string.h>
115: #include <stdlib.h>
116: #include <fcntl.h>
117: #include <ctype.h>
118: #include <signal.h>
119: #include <stddef.h>
120: #include <time.h>
121: #include <errno.h>
122: #include <pwd.h>
123: #include <grp.h>
124: #include <stdarg.h>
125: #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__)
126: # include <netinet/if_ether.h>
127: #else
128: # include <net/ethernet.h>
129: #endif
130: #include <net/if_arp.h>
131: #include <netinet/in_systm.h>
132: #include <netinet/ip.h>
133: #include <netinet/ip6.h>
134: #include <netinet/ip_icmp.h>
135: #include <netinet/tcp.h>
136: #include <sys/uio.h>
137: #include <syslog.h>
138: #include <dirent.h>
139: #ifndef HAVE_LINUX_NETWORK
140: # include <net/if_dl.h>
141: #endif
142:
143: #if defined(HAVE_LINUX_NETWORK)
144: #include <linux/version.h>
145: #include <linux/sockios.h>
146: #include <linux/capability.h>
147: /* There doesn't seem to be a universally-available
148: userspace header for these. */
149: extern int capset(cap_user_header_t header, cap_user_data_t data);
150: extern int capget(cap_user_header_t header, cap_user_data_t data);
151: #define LINUX_CAPABILITY_VERSION_1 0x19980330
152: #define LINUX_CAPABILITY_VERSION_2 0x20071026
153: #define LINUX_CAPABILITY_VERSION_3 0x20080522
154:
155: #include <sys/prctl.h>
156: #elif defined(HAVE_SOLARIS_NETWORK)
157: #include <priv.h>
158: #endif
159:
160: /* Backwards compat with 2.83 */
161: #if defined(HAVE_NETTLEHASH)
162: # define HAVE_CRYPTOHASH
163: #endif
164: #if defined(HAVE_DNSSEC) || defined(HAVE_CRYPTOHASH)
165: # include <nettle/nettle-meta.h>
166: #endif
167:
168: /* daemon is function in the C library.... */
169: #define daemon dnsmasq_daemon
170:
171: #define ADDRSTRLEN INET6_ADDRSTRLEN
172:
173: /* Async event queue */
174: struct event_desc {
175: int event, data, msg_sz;
176: };
177:
178: #define EVENT_RELOAD 1
179: #define EVENT_DUMP 2
180: #define EVENT_ALARM 3
181: #define EVENT_TERM 4
182: #define EVENT_CHILD 5
183: #define EVENT_REOPEN 6
184: #define EVENT_EXITED 7
185: #define EVENT_KILLED 8
186: #define EVENT_EXEC_ERR 9
187: #define EVENT_PIPE_ERR 10
188: #define EVENT_USER_ERR 11
189: #define EVENT_CAP_ERR 12
190: #define EVENT_PIDFILE 13
191: #define EVENT_HUSER_ERR 14
192: #define EVENT_GROUP_ERR 15
193: #define EVENT_DIE 16
194: #define EVENT_LOG_ERR 17
195: #define EVENT_FORK_ERR 18
196: #define EVENT_LUA_ERR 19
197: #define EVENT_TFTP_ERR 20
198: #define EVENT_INIT 21
199: #define EVENT_NEWADDR 22
200: #define EVENT_NEWROUTE 23
201: #define EVENT_TIME_ERR 24
202: #define EVENT_SCRIPT_LOG 25
203: #define EVENT_TIME 26
204:
205: /* Exit codes. */
206: #define EC_GOOD 0
207: #define EC_BADCONF 1
208: #define EC_BADNET 2
209: #define EC_FILE 3
210: #define EC_NOMEM 4
211: #define EC_MISC 5
212: #define EC_INIT_OFFSET 10
213:
214: #define OPT_BOGUSPRIV 0
215: #define OPT_FILTER 1
216: #define OPT_LOG 2
217: #define OPT_SELFMX 3
218: #define OPT_NO_HOSTS 4
219: #define OPT_NO_POLL 5
220: #define OPT_DEBUG 6
221: #define OPT_ORDER 7
222: #define OPT_NO_RESOLV 8
223: #define OPT_EXPAND 9
224: #define OPT_LOCALMX 10
225: #define OPT_NO_NEG 11
226: #define OPT_NODOTS_LOCAL 12
227: #define OPT_NOWILD 13
228: #define OPT_ETHERS 14
229: #define OPT_RESOLV_DOMAIN 15
230: #define OPT_NO_FORK 16
231: #define OPT_AUTHORITATIVE 17
232: #define OPT_LOCALISE 18
233: #define OPT_DBUS 19
234: #define OPT_DHCP_FQDN 20
235: #define OPT_NO_PING 21
236: #define OPT_LEASE_RO 22
237: #define OPT_ALL_SERVERS 23
238: #define OPT_RELOAD 24
239: #define OPT_LOCAL_REBIND 25
240: #define OPT_TFTP_SECURE 26
241: #define OPT_TFTP_NOBLOCK 27
242: #define OPT_LOG_OPTS 28
243: #define OPT_TFTP_APREF_IP 29
244: #define OPT_NO_OVERRIDE 30
245: #define OPT_NO_REBIND 31
246: #define OPT_ADD_MAC 32
247: #define OPT_DNSSEC_PROXY 33
248: #define OPT_CONSEC_ADDR 34
249: #define OPT_CONNTRACK 35
250: #define OPT_FQDN_UPDATE 36
251: #define OPT_RA 37
252: #define OPT_TFTP_LC 38
253: #define OPT_CLEVERBIND 39
254: #define OPT_TFTP 40
255: #define OPT_CLIENT_SUBNET 41
256: #define OPT_QUIET_DHCP 42
257: #define OPT_QUIET_DHCP6 43
258: #define OPT_QUIET_RA 44
259: #define OPT_DNSSEC_VALID 45
260: #define OPT_DNSSEC_TIME 46
261: #define OPT_DNSSEC_DEBUG 47
262: #define OPT_DNSSEC_IGN_NS 48
263: #define OPT_LOCAL_SERVICE 49
264: #define OPT_LOOP_DETECT 50
265: #define OPT_EXTRALOG 51
266: #define OPT_TFTP_NO_FAIL 52
267: #define OPT_SCRIPT_ARP 53
268: #define OPT_MAC_B64 54
269: #define OPT_MAC_HEX 55
270: #define OPT_TFTP_APREF_MAC 56
271: #define OPT_RAPID_COMMIT 57
272: #define OPT_UBUS 58
273: #define OPT_IGNORE_CLID 59
274: #define OPT_SINGLE_PORT 60
275: #define OPT_LEASE_RENEW 61
276: #define OPT_LAST 62
277:
278: #define OPTION_BITS (sizeof(unsigned int)*8)
279: #define OPTION_SIZE ( (OPT_LAST/OPTION_BITS)+((OPT_LAST%OPTION_BITS)!=0) )
280: #define option_var(x) (daemon->options[(x) / OPTION_BITS])
281: #define option_val(x) ((1u) << ((x) % OPTION_BITS))
282: #define option_bool(x) (option_var(x) & option_val(x))
283:
284: /* extra flags for my_syslog, we use a couple of facilities since they are known
285: not to occupy the same bits as priorities, no matter how syslog.h is set up. */
286: #define MS_TFTP LOG_USER
287: #define MS_DHCP LOG_DAEMON
288: #define MS_SCRIPT LOG_MAIL
289:
290: /* Note that this is used widely as a container for IPv4/IPv6 addresses,
291: so for that reason, was well as to avoid wasting memory in almost every
292: cache entry, the other variants should not be larger than
293: sizeof(struct in6_addr) - 16 bytes.
294: */
295: union all_addr {
296: struct in_addr addr4;
297: struct in6_addr addr6;
298: struct {
299: union {
300: struct crec *cache;
301: char *name;
302: } target;
303: unsigned int uid;
304: int is_name_ptr; /* disciminates target union */
305: } cname;
306: struct {
307: struct blockdata *keydata;
308: unsigned short keylen, flags, keytag;
309: unsigned char algo;
310: } key;
311: struct {
312: struct blockdata *keydata;
313: unsigned short keylen, keytag;
314: unsigned char algo;
315: unsigned char digest;
316: } ds;
317: struct {
318: struct blockdata *target;
319: unsigned short targetlen, srvport, priority, weight;
320: } srv;
321: /* for log_query */
322: struct {
323: unsigned short keytag, algo, digest, rcode;
324: } log;
325: };
326:
327:
328: struct bogus_addr {
329: struct in_addr addr;
330: struct bogus_addr *next;
331: };
332:
333: /* dns doctor param */
334: struct doctor {
335: struct in_addr in, end, out, mask;
336: struct doctor *next;
337: };
338:
339: struct mx_srv_record {
340: char *name, *target;
341: int issrv, srvport, priority, weight;
342: unsigned int offset;
343: struct mx_srv_record *next;
344: };
345:
346: struct naptr {
347: char *name, *replace, *regexp, *services, *flags;
348: unsigned int order, pref;
349: struct naptr *next;
350: };
351:
352: #ifndef NO_ID
353: #define TXT_STAT_CACHESIZE 1
354: #define TXT_STAT_INSERTS 2
355: #define TXT_STAT_EVICTIONS 3
356: #define TXT_STAT_MISSES 4
357: #define TXT_STAT_HITS 5
358: #define TXT_STAT_AUTH 6
359: #define TXT_STAT_SERVERS 7
360: #endif
361:
362: struct txt_record {
363: char *name;
364: unsigned char *txt;
365: unsigned short class, len;
366: int stat;
367: struct txt_record *next;
368: };
369:
370: struct ptr_record {
371: char *name, *ptr;
372: struct ptr_record *next;
373: };
374:
375: struct cname {
376: int ttl, flag;
377: char *alias, *target;
378: struct cname *next, *targetp;
379: };
380:
381: struct ds_config {
382: char *name, *digest;
383: int digestlen, class, algo, keytag, digest_type;
384: struct ds_config *next;
385: };
386:
387: #define ADDRLIST_LITERAL 1
388: #define ADDRLIST_IPV6 2
389: #define ADDRLIST_REVONLY 4
390: #define ADDRLIST_PREFIX 8
391: #define ADDRLIST_WILDCARD 16
392: #define ADDRLIST_DECLINED 32
393:
394: struct addrlist {
395: union all_addr addr;
396: int flags, prefixlen;
397: time_t decline_time;
398: struct addrlist *next;
399: };
400:
401: #define AUTH6 1
402: #define AUTH4 2
403:
404: struct auth_zone {
405: char *domain;
406: struct auth_name_list {
407: char *name;
408: int flags;
409: struct auth_name_list *next;
410: } *interface_names;
411: struct addrlist *subnet;
412: struct addrlist *exclude;
413: struct auth_zone *next;
414: };
415:
416: #define HR_6 1
417: #define HR_4 2
418:
419: struct host_record {
420: int ttl, flags;
421: struct name_list {
422: char *name;
423: struct name_list *next;
424: } *names;
425: struct in_addr addr;
426: struct in6_addr addr6;
427: struct host_record *next;
428: };
429:
430: struct interface_name {
431: char *name; /* domain name */
432: char *intr; /* interface name */
433: int family; /* AF_INET, AF_INET6 or zero for both */
434: struct addrlist *addr;
435: struct interface_name *next;
436: };
437:
438: union bigname {
439: char name[MAXDNAME];
440: union bigname *next; /* freelist */
441: };
442:
443: struct blockdata {
444: struct blockdata *next;
445: unsigned char key[KEYBLOCK_LEN];
446: };
447:
448: struct crec {
449: struct crec *next, *prev, *hash_next;
450: union all_addr addr;
451: time_t ttd; /* time to die */
452: /* used as class if DNSKEY/DS, index to source for F_HOSTS */
453: unsigned int uid;
454: unsigned int flags;
455: union {
456: char sname[SMALLDNAME];
457: union bigname *bname;
458: char *namep;
459: } name;
460: };
461:
462: #define SIZEOF_BARE_CREC (sizeof(struct crec) - SMALLDNAME)
463: #define SIZEOF_POINTER_CREC (sizeof(struct crec) + sizeof(char *) - SMALLDNAME)
464:
465: #define F_IMMORTAL (1u<<0)
466: #define F_NAMEP (1u<<1)
467: #define F_REVERSE (1u<<2)
468: #define F_FORWARD (1u<<3)
469: #define F_DHCP (1u<<4)
470: #define F_NEG (1u<<5)
471: #define F_HOSTS (1u<<6)
472: #define F_IPV4 (1u<<7)
473: #define F_IPV6 (1u<<8)
474: #define F_BIGNAME (1u<<9)
475: #define F_NXDOMAIN (1u<<10)
476: #define F_CNAME (1u<<11)
477: #define F_DNSKEY (1u<<12)
478: #define F_CONFIG (1u<<13)
479: #define F_DS (1u<<14)
480: #define F_DNSSECOK (1u<<15)
481: #define F_UPSTREAM (1u<<16)
482: #define F_RRNAME (1u<<17)
483: #define F_SERVER (1u<<18)
484: #define F_QUERY (1u<<19)
485: #define F_NOERR (1u<<20)
486: #define F_AUTH (1u<<21)
487: #define F_DNSSEC (1u<<22)
488: #define F_KEYTAG (1u<<23)
489: #define F_SECSTAT (1u<<24)
490: #define F_NO_RR (1u<<25)
491: #define F_IPSET (1u<<26)
492: #define F_NOEXTRA (1u<<27)
493: #define F_SERVFAIL (1u<<28) /* currently unused. */
494: #define F_RCODE (1u<<29)
495: #define F_SRV (1u<<30)
496:
497: #define UID_NONE 0
498: /* Values of uid in crecs with F_CONFIG bit set. */
499: #define SRC_CONFIG 1
500: #define SRC_HOSTS 2
501: #define SRC_AH 3
502:
503:
504: /* struct sockaddr is not large enough to hold any address,
505: and specifically not big enough to hold an IPv6 address.
506: Blech. Roll our own. */
507: union mysockaddr {
508: struct sockaddr sa;
509: struct sockaddr_in in;
510: struct sockaddr_in6 in6;
511: };
512:
513: /* bits in flag param to IPv6 callbacks from iface_enumerate() */
514: #define IFACE_TENTATIVE 1
515: #define IFACE_DEPRECATED 2
516: #define IFACE_PERMANENT 4
517:
518:
519: #define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */
520: #define SERV_NO_ADDR 2 /* no server, this domain is local only */
521: #define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */
522: #define SERV_HAS_DOMAIN 8 /* server for one domain only */
523: #define SERV_HAS_SOURCE 16 /* source address defined */
524: #define SERV_FOR_NODOTS 32 /* server for names with no domain part only */
525: #define SERV_WARNED_RECURSIVE 64 /* avoid warning spam */
526: #define SERV_FROM_DBUS 128 /* 1 if source is DBus */
527: #define SERV_MARK 256 /* for mark-and-delete */
528: #define SERV_TYPE (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
529: #define SERV_COUNTED 512 /* workspace for log code */
530: #define SERV_USE_RESOLV 1024 /* forward this domain in the normal way */
531: #define SERV_NO_REBIND 2048 /* inhibit dns-rebind protection */
532: #define SERV_FROM_FILE 4096 /* read from --servers-file */
533: #define SERV_LOOP 8192 /* server causes forwarding loop */
534: #define SERV_DO_DNSSEC 16384 /* Validate DNSSEC when using this server */
535: #define SERV_GOT_TCP 32768 /* Got some data from the TCP connection */
536:
537: struct serverfd {
538: int fd;
539: union mysockaddr source_addr;
540: char interface[IF_NAMESIZE+1];
541: unsigned int ifindex, used, preallocated;
542: struct serverfd *next;
543: };
544:
545: struct randfd {
546: int fd;
547: unsigned short refcount, family;
548: };
549:
550: struct server {
551: union mysockaddr addr, source_addr;
552: char interface[IF_NAMESIZE+1];
553: struct serverfd *sfd;
554: char *domain; /* set if this server only handles a domain. */
555: int flags, tcpfd, edns_pktsz;
556: time_t pktsz_reduced;
557: unsigned int queries, failed_queries;
558: #ifdef HAVE_LOOP
559: u32 uid;
560: #endif
561: struct server *next;
562: };
563:
564: struct ipsets {
565: char **sets;
566: char *domain;
567: struct ipsets *next;
568: };
569:
570: struct irec {
571: union mysockaddr addr;
572: struct in_addr netmask; /* only valid for IPv4 */
573: int tftp_ok, dhcp_ok, mtu, done, warned, dad, dns_auth, index, multicast_done, found, label;
574: char *name;
575: struct irec *next;
576: };
577:
578: struct listener {
579: int fd, tcpfd, tftpfd, used;
580: union mysockaddr addr;
581: struct irec *iface; /* only sometimes valid for non-wildcard */
582: struct listener *next;
583: };
584:
585: /* interface and address parms from command line. */
586: struct iname {
587: char *name;
588: union mysockaddr addr;
589: int used;
590: struct iname *next;
591: };
592:
593: /* subnet parameters from command line */
594: struct mysubnet {
595: union mysockaddr addr;
596: int addr_used;
597: int mask;
598: };
599:
600: /* resolv-file parms from command-line */
601: struct resolvc {
602: struct resolvc *next;
603: int is_default, logged;
604: time_t mtime;
605: char *name;
606: #ifdef HAVE_INOTIFY
607: int wd; /* inotify watch descriptor */
608: char *file; /* pointer to file part if path */
609: #endif
610: };
611:
612: /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile and dhcp-hostsdir*/
613: #define AH_DIR 1
614: #define AH_INACTIVE 2
615: #define AH_WD_DONE 4
616: #define AH_HOSTS 8
617: #define AH_DHCP_HST 16
618: #define AH_DHCP_OPT 32
619: struct hostsfile {
620: struct hostsfile *next;
621: int flags;
622: char *fname;
623: #ifdef HAVE_INOTIFY
624: int wd; /* inotify watch descriptor */
625: #endif
626: unsigned int index; /* matches to cache entries for logging */
627: };
628:
629: /* packet-dump flags */
630: #define DUMP_QUERY 0x0001
631: #define DUMP_REPLY 0x0002
632: #define DUMP_UP_QUERY 0x0004
633: #define DUMP_UP_REPLY 0x0008
634: #define DUMP_SEC_QUERY 0x0010
635: #define DUMP_SEC_REPLY 0x0020
636: #define DUMP_BOGUS 0x0040
637: #define DUMP_SEC_BOGUS 0x0080
638:
639:
640: /* DNSSEC status values. */
641: #define STAT_SECURE 1
642: #define STAT_INSECURE 2
643: #define STAT_BOGUS 3
644: #define STAT_NEED_DS 4
645: #define STAT_NEED_KEY 5
646: #define STAT_TRUNCATED 6
647: #define STAT_SECURE_WILDCARD 7
648: #define STAT_OK 8
649: #define STAT_ABANDONED 9
650:
651: #define FREC_NOREBIND 1
652: #define FREC_CHECKING_DISABLED 2
653: #define FREC_HAS_SUBNET 4
654: #define FREC_DNSKEY_QUERY 8
655: #define FREC_DS_QUERY 16
656: #define FREC_AD_QUESTION 32
657: #define FREC_DO_QUESTION 64
658: #define FREC_ADDED_PHEADER 128
659: #define FREC_TEST_PKTSZ 256
660: #define FREC_HAS_EXTRADATA 512
661: #define FREC_HAS_PHEADER 1024
662: #define FREC_NO_CACHE 2048
663:
664: #define HASH_SIZE 32 /* SHA-256 digest size */
665:
666: struct frec {
667: struct frec_src {
668: union mysockaddr source;
669: union all_addr dest;
670: unsigned int iface, log_id;
671: int fd;
672: unsigned short orig_id;
673: struct frec_src *next;
674: } frec_src;
675: struct server *sentto; /* NULL means free */
676: struct randfd *rfd4;
677: struct randfd *rfd6;
678: unsigned short new_id;
679: int forwardall, flags;
680: time_t time;
681: unsigned char *hash[HASH_SIZE];
682: #ifdef HAVE_DNSSEC
683: int class, work_counter;
684: struct blockdata *stash; /* Saved reply, whilst we validate */
685: size_t stash_len;
686: struct frec *dependent; /* Query awaiting internally-generated DNSKEY or DS query */
687: struct frec *blocking_query; /* Query which is blocking us. */
688: #endif
689: struct frec *next;
690: };
691:
692: /* flags in top of length field for DHCP-option tables */
693: #define OT_ADDR_LIST 0x8000
694: #define OT_RFC1035_NAME 0x4000
695: #define OT_INTERNAL 0x2000
696: #define OT_NAME 0x1000
697: #define OT_CSTRING 0x0800
698: #define OT_DEC 0x0400
699: #define OT_TIME 0x0200
700:
701: /* actions in the daemon->helper RPC */
702: #define ACTION_DEL 1
703: #define ACTION_OLD_HOSTNAME 2
704: #define ACTION_OLD 3
705: #define ACTION_ADD 4
706: #define ACTION_TFTP 5
707: #define ACTION_ARP 6
708: #define ACTION_ARP_DEL 7
709:
710: #define LEASE_NEW 1 /* newly created */
711: #define LEASE_CHANGED 2 /* modified */
712: #define LEASE_AUX_CHANGED 4 /* CLID or expiry changed */
713: #define LEASE_AUTH_NAME 8 /* hostname came from config, not from client */
714: #define LEASE_USED 16 /* used this DHCPv6 transaction */
715: #define LEASE_NA 32 /* IPv6 no-temporary lease */
716: #define LEASE_TA 64 /* IPv6 temporary lease */
717: #define LEASE_HAVE_HWADDR 128 /* Have set hwaddress */
718: #define LEASE_EXP_CHANGED 256 /* Lease expiry time changed */
719:
720: struct dhcp_lease {
721: int clid_len; /* length of client identifier */
722: unsigned char *clid; /* clientid */
723: char *hostname, *fqdn; /* name from client-hostname option or config */
724: char *old_hostname; /* hostname before it moved to another lease */
725: int flags;
726: time_t expires; /* lease expiry */
727: #ifdef HAVE_BROKEN_RTC
728: unsigned int length;
729: #endif
730: int hwaddr_len, hwaddr_type;
731: unsigned char hwaddr[DHCP_CHADDR_MAX];
732: struct in_addr addr, override, giaddr;
733: unsigned char *extradata;
734: unsigned int extradata_len, extradata_size;
735: int last_interface;
736: int new_interface; /* save possible originated interface */
737: int new_prefixlen; /* and its prefix length */
738: #ifdef HAVE_DHCP6
739: struct in6_addr addr6;
740: unsigned int iaid;
741: struct slaac_address {
742: struct in6_addr addr;
743: time_t ping_time;
744: int backoff; /* zero -> confirmed */
745: struct slaac_address *next;
746: } *slaac_address;
747: int vendorclass_count;
748: #endif
749: struct dhcp_lease *next;
750: };
751:
752: struct dhcp_netid {
753: char *net;
754: struct dhcp_netid *next;
755: };
756:
757: struct dhcp_netid_list {
758: struct dhcp_netid *list;
759: struct dhcp_netid_list *next;
760: };
761:
762: struct tag_if {
763: struct dhcp_netid_list *set;
764: struct dhcp_netid *tag;
765: struct tag_if *next;
766: };
767:
768: struct delay_config {
769: int delay;
770: struct dhcp_netid *netid;
771: struct delay_config *next;
772: };
773:
774: struct hwaddr_config {
775: int hwaddr_len, hwaddr_type;
776: unsigned char hwaddr[DHCP_CHADDR_MAX];
777: unsigned int wildcard_mask;
778: struct hwaddr_config *next;
779: };
780:
781: struct dhcp_config {
782: unsigned int flags;
783: int clid_len; /* length of client identifier */
784: unsigned char *clid; /* clientid */
785: char *hostname, *domain;
786: struct dhcp_netid_list *netid;
787: struct dhcp_netid *filter;
788: #ifdef HAVE_DHCP6
789: struct addrlist *addr6;
790: #endif
791: struct in_addr addr;
792: time_t decline_time;
793: unsigned int lease_time;
794: struct hwaddr_config *hwaddr;
795: struct dhcp_config *next;
796: };
797:
798: #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
799:
800: #define CONFIG_DISABLE 1
801: #define CONFIG_CLID 2
802: #define CONFIG_TIME 8
803: #define CONFIG_NAME 16
804: #define CONFIG_ADDR 32
805: #define CONFIG_NOCLID 128
806: #define CONFIG_FROM_ETHERS 256 /* entry created by /etc/ethers */
807: #define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */
808: #define CONFIG_DECLINED 1024 /* address declined by client */
809: #define CONFIG_BANK 2048 /* from dhcp hosts file */
810: #define CONFIG_ADDR6 4096
811: #define CONFIG_ADDR6_HOSTS 16384 /* address added by from /etc/hosts */
812:
813: struct dhcp_opt {
814: int opt, len, flags;
815: union {
816: int encap;
817: unsigned int wildcard_mask;
818: unsigned char *vendor_class;
819: } u;
820: unsigned char *val;
821: struct dhcp_netid *netid;
822: struct dhcp_opt *next;
823: };
824:
825: #define DHOPT_ADDR 1
826: #define DHOPT_STRING 2
827: #define DHOPT_ENCAPSULATE 4
828: #define DHOPT_ENCAP_MATCH 8
829: #define DHOPT_FORCE 16
830: #define DHOPT_BANK 32
831: #define DHOPT_ENCAP_DONE 64
832: #define DHOPT_MATCH 128
833: #define DHOPT_VENDOR 256
834: #define DHOPT_HEX 512
835: #define DHOPT_VENDOR_MATCH 1024
836: #define DHOPT_RFC3925 2048
837: #define DHOPT_TAGOK 4096
838: #define DHOPT_ADDR6 8192
839: #define DHOPT_VENDOR_PXE 16384
840:
841: struct dhcp_boot {
842: char *file, *sname, *tftp_sname;
843: struct in_addr next_server;
844: struct dhcp_netid *netid;
845: struct dhcp_boot *next;
846: };
847:
848: struct dhcp_match_name {
849: char *name;
850: int wildcard;
851: struct dhcp_netid *netid;
852: struct dhcp_match_name *next;
853: };
854:
855: struct pxe_service {
856: unsigned short CSA, type;
857: char *menu, *basename, *sname;
858: struct in_addr server;
859: struct dhcp_netid *netid;
860: struct pxe_service *next;
861: };
862:
863: #define DHCP_PXE_DEF_VENDOR "PXEClient"
864:
865: #define MATCH_VENDOR 1
866: #define MATCH_USER 2
867: #define MATCH_CIRCUIT 3
868: #define MATCH_REMOTE 4
869: #define MATCH_SUBSCRIBER 5
870:
871: /* vendorclass, userclass, remote-id or circuit-id */
872: struct dhcp_vendor {
873: int len, match_type;
874: unsigned int enterprise;
875: char *data;
876: struct dhcp_netid netid;
877: struct dhcp_vendor *next;
878: };
879:
880: struct dhcp_pxe_vendor {
881: char *data;
882: struct dhcp_pxe_vendor *next;
883: };
884:
885: struct dhcp_mac {
886: unsigned int mask;
887: int hwaddr_len, hwaddr_type;
888: unsigned char hwaddr[DHCP_CHADDR_MAX];
889: struct dhcp_netid netid;
890: struct dhcp_mac *next;
891: };
892:
893: struct dhcp_bridge {
894: char iface[IF_NAMESIZE];
895: struct dhcp_bridge *alias, *next;
896: };
897:
898: struct cond_domain {
899: char *domain, *prefix;
900: struct in_addr start, end;
901: struct in6_addr start6, end6;
902: int is6, indexed;
903: struct cond_domain *next;
904: };
905:
906: struct ra_interface {
907: char *name;
908: char *mtu_name;
909: int interval, lifetime, prio, mtu;
910: struct ra_interface *next;
911: };
912:
913: struct dhcp_context {
914: unsigned int lease_time, addr_epoch;
915: struct in_addr netmask, broadcast;
916: struct in_addr local, router;
917: struct in_addr start, end; /* range of available addresses */
918: #ifdef HAVE_DHCP6
919: struct in6_addr start6, end6; /* range of available addresses */
920: struct in6_addr local6;
921: int prefix, if_index;
922: unsigned int valid, preferred, saved_valid;
923: time_t ra_time, ra_short_period_start, address_lost_time;
924: char *template_interface;
925: #endif
926: int flags;
927: struct dhcp_netid netid, *filter;
928: struct dhcp_context *next, *current;
929: };
930:
931: struct shared_network {
932: int if_index;
933: struct in_addr match_addr, shared_addr;
934: #ifdef HAVE_DHCP6
935: /* shared_addr == 0 for IP6 entries. */
936: struct in6_addr match_addr6, shared_addr6;
937: #endif
938: struct shared_network *next;
939: };
940:
941: #define CONTEXT_STATIC (1u<<0)
942: #define CONTEXT_NETMASK (1u<<1)
943: #define CONTEXT_BRDCAST (1u<<2)
944: #define CONTEXT_PROXY (1u<<3)
945: #define CONTEXT_RA_ROUTER (1u<<4)
946: #define CONTEXT_RA_DONE (1u<<5)
947: #define CONTEXT_RA_NAME (1u<<6)
948: #define CONTEXT_RA_STATELESS (1u<<7)
949: #define CONTEXT_DHCP (1u<<8)
950: #define CONTEXT_DEPRECATE (1u<<9)
951: #define CONTEXT_TEMPLATE (1u<<10) /* create contexts using addresses */
952: #define CONTEXT_CONSTRUCTED (1u<<11)
953: #define CONTEXT_GC (1u<<12)
954: #define CONTEXT_RA (1u<<13)
955: #define CONTEXT_CONF_USED (1u<<14)
956: #define CONTEXT_USED (1u<<15)
957: #define CONTEXT_OLD (1u<<16)
958: #define CONTEXT_V6 (1u<<17)
959: #define CONTEXT_RA_OFF_LINK (1u<<18)
960: #define CONTEXT_SETLEASE (1u<<19)
961:
962: struct ping_result {
963: struct in_addr addr;
964: time_t time;
965: unsigned int hash;
966: struct ping_result *next;
967: };
968:
969: struct tftp_file {
970: int refcount, fd;
971: off_t size;
972: dev_t dev;
973: ino_t inode;
974: char filename[];
975: };
976:
977: struct tftp_transfer {
978: int sockfd;
979: time_t timeout;
980: int backoff;
981: unsigned int block, blocksize, expansion;
982: off_t offset;
983: union mysockaddr peer;
984: union all_addr source;
985: int if_index;
986: char opt_blocksize, opt_transize, netascii, carrylf;
987: struct tftp_file *file;
988: struct tftp_transfer *next;
989: };
990:
991: struct addr_list {
992: struct in_addr addr;
993: struct addr_list *next;
994: };
995:
996: struct tftp_prefix {
997: char *interface;
998: char *prefix;
999: int missing;
1000: struct tftp_prefix *next;
1001: };
1002:
1003: struct dhcp_relay {
1004: union all_addr local, server;
1005: char *interface; /* Allowable interface for replies from server, and dest for IPv6 multicast */
1006: int iface_index; /* working - interface in which requests arrived, for return */
1007: struct dhcp_relay *current, *next;
1008: };
1009:
1010: extern struct daemon {
1011: /* datastuctures representing the command-line and
1012: config file arguments. All set (including defaults)
1013: in option.c */
1014:
1015: unsigned int options[OPTION_SIZE];
1016: struct resolvc default_resolv, *resolv_files;
1017: time_t last_resolv;
1018: char *servers_file;
1019: struct mx_srv_record *mxnames;
1020: struct naptr *naptr;
1021: struct txt_record *txt, *rr;
1022: struct ptr_record *ptr;
1023: struct host_record *host_records, *host_records_tail;
1024: struct cname *cnames;
1025: struct auth_zone *auth_zones;
1026: struct interface_name *int_names;
1027: char *mxtarget;
1028: struct mysubnet *add_subnet4;
1029: struct mysubnet *add_subnet6;
1030: char *lease_file;
1031: char *username, *groupname, *scriptuser;
1032: char *luascript;
1033: char *authserver, *hostmaster;
1034: struct iname *authinterface;
1035: struct name_list *secondary_forward_server;
1036: int group_set, osport;
1037: char *domain_suffix;
1038: struct cond_domain *cond_domain, *synth_domains;
1039: char *runfile;
1040: char *lease_change_command;
1041: struct iname *if_names, *if_addrs, *if_except, *dhcp_except, *auth_peers, *tftp_interfaces;
1042: struct bogus_addr *bogus_addr, *ignore_addr;
1043: struct server *servers;
1044: struct ipsets *ipsets;
1045: int log_fac; /* log facility */
1046: char *log_file; /* optional log file */
1047: int max_logs; /* queue limit */
1048: int cachesize, ftabsize;
1049: int port, query_port, min_port, max_port;
1050: unsigned long local_ttl, neg_ttl, max_ttl, min_cache_ttl, max_cache_ttl, auth_ttl, dhcp_ttl, use_dhcp_ttl;
1051: char *dns_client_id;
1052: struct hostsfile *addn_hosts;
1053: struct dhcp_context *dhcp, *dhcp6;
1054: struct ra_interface *ra_interfaces;
1055: struct dhcp_config *dhcp_conf;
1056: struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
1057: struct dhcp_match_name *dhcp_name_match;
1058: struct dhcp_pxe_vendor *dhcp_pxe_vendors;
1059: struct dhcp_vendor *dhcp_vendors;
1060: struct dhcp_mac *dhcp_macs;
1061: struct dhcp_boot *boot_config;
1062: struct pxe_service *pxe_services;
1063: struct tag_if *tag_if;
1064: struct addr_list *override_relays;
1065: struct dhcp_relay *relay4, *relay6;
1066: struct delay_config *delay_conf;
1067: int override;
1068: int enable_pxe;
1069: int doing_ra, doing_dhcp6;
1070: struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
1071: struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
1072: struct hostsfile *dhcp_hosts_file, *dhcp_opts_file, *dynamic_dirs;
1073: int dhcp_max, tftp_max, tftp_mtu;
1074: int dhcp_server_port, dhcp_client_port;
1075: int start_tftp_port, end_tftp_port;
1076: unsigned int min_leasetime;
1077: struct doctor *doctors;
1078: unsigned short edns_pktsz;
1079: char *tftp_prefix;
1080: struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
1081: unsigned int duid_enterprise, duid_config_len;
1082: unsigned char *duid_config;
1083: char *dbus_name;
1084: char *ubus_name;
1085: char *dump_file;
1086: int dump_mask;
1087: unsigned long soa_sn, soa_refresh, soa_retry, soa_expiry;
1088: u32 metrics[__METRIC_MAX];
1089: #ifdef HAVE_DNSSEC
1090: struct ds_config *ds;
1091: char *timestamp_file;
1092: #endif
1093:
1094: /* globally used stuff for DNS */
1095: char *packet; /* packet buffer */
1096: int packet_buff_sz; /* size of above */
1097: char *namebuff; /* MAXDNAME size buffer */
1098: #ifdef HAVE_DNSSEC
1099: char *keyname; /* MAXDNAME size buffer */
1100: char *workspacename; /* ditto */
1101: unsigned long *rr_status; /* ceiling in TTL from DNSSEC or zero for insecure */
1102: int rr_status_sz;
1103: int dnssec_no_time_check;
1104: int back_to_the_future;
1105: #endif
1106: struct frec *frec_list;
1107: struct frec_src *free_frec_src;
1108: int frec_src_count;
1109: struct serverfd *sfds;
1110: struct irec *interfaces;
1111: struct listener *listeners;
1112: struct server *last_server;
1113: time_t forwardtime;
1114: int forwardcount;
1115: struct server *srv_save; /* Used for resend on DoD */
1116: size_t packet_len; /* " " */
1117: struct randfd *rfd_save; /* " " */
1118: pid_t tcp_pids[MAX_PROCS];
1119: int tcp_pipes[MAX_PROCS];
1120: int pipe_to_parent;
1121: struct randfd randomsocks[RANDOM_SOCKS];
1122: int v6pktinfo;
1123: struct addrlist *interface_addrs; /* list of all addresses/prefix lengths associated with all local interfaces */
1124: int log_id, log_display_id; /* ids of transactions for logging */
1125: union mysockaddr *log_source_addr;
1126:
1127: /* DHCP state */
1128: int dhcpfd, helperfd, pxefd;
1129: #ifdef HAVE_INOTIFY
1130: int inotifyfd;
1131: #endif
1132: #if defined(HAVE_LINUX_NETWORK)
1133: int netlinkfd, kernel_version;
1134: #elif defined(HAVE_BSD_NETWORK)
1135: int dhcp_raw_fd, dhcp_icmp_fd, routefd;
1136: #endif
1137: struct iovec dhcp_packet;
1138: char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
1139: struct ping_result *ping_results;
1140: FILE *lease_stream;
1141: struct dhcp_bridge *bridges;
1142: struct shared_network *shared_networks;
1143: #ifdef HAVE_DHCP6
1144: int duid_len;
1145: unsigned char *duid;
1146: struct iovec outpacket;
1147: int dhcp6fd, icmp6fd;
1148: #endif
1149: /* DBus stuff */
1150: /* void * here to avoid depending on dbus headers outside dbus.c */
1151: void *dbus;
1152: #ifdef HAVE_DBUS
1153: struct watch *watches;
1154: #endif
1155: /* UBus stuff */
1156: #ifdef HAVE_UBUS
1157: /* void * here to avoid depending on ubus headers outside ubus.c */
1158: void *ubus;
1159: #endif
1160:
1161: /* TFTP stuff */
1162: struct tftp_transfer *tftp_trans, *tftp_done_trans;
1163:
1164: /* utility string buffer, hold max sized IP address as string */
1165: char *addrbuff;
1166: char *addrbuff2; /* only allocated when OPT_EXTRALOG */
1167:
1168: #ifdef HAVE_DUMPFILE
1169: /* file for packet dumps. */
1170: int dumpfd;
1171: #endif
1172: } *daemon;
1173:
1174: /* cache.c */
1175: void cache_init(void);
1176: void next_uid(struct crec *crecp);
1177: void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg);
1178: char *record_source(unsigned int index);
1179: char *querystr(char *desc, unsigned short type);
1180: int cache_find_non_terminal(char *name, time_t now);
1181: struct crec *cache_find_by_addr(struct crec *crecp,
1182: union all_addr *addr, time_t now,
1183: unsigned int prot);
1184: struct crec *cache_find_by_name(struct crec *crecp,
1185: char *name, time_t now, unsigned int prot);
1186: void cache_end_insert(void);
1187: void cache_start_insert(void);
1188: int cache_recv_insert(time_t now, int fd);
1189: struct crec *cache_insert(char *name, union all_addr *addr, unsigned short class,
1190: time_t now, unsigned long ttl, unsigned int flags);
1191: void cache_reload(void);
1192: void cache_add_dhcp_entry(char *host_name, int prot, union all_addr *host_address, time_t ttd);
1193: struct in_addr a_record_from_hosts(char *name, time_t now);
1194: void cache_unhash_dhcp(void);
1195: void dump_cache(time_t now);
1196: #ifndef NO_ID
1197: int cache_make_stat(struct txt_record *t);
1198: #endif
1199: char *cache_get_name(struct crec *crecp);
1200: char *cache_get_cname_target(struct crec *crecp);
1201: struct crec *cache_enumerate(int init);
1202: int read_hostsfile(char *filename, unsigned int index, int cache_size,
1203: struct crec **rhash, int hashsz);
1204:
1205: /* blockdata.c */
1206: void blockdata_init(void);
1207: void blockdata_report(void);
1208: struct blockdata *blockdata_alloc(char *data, size_t len);
1209: void *blockdata_retrieve(struct blockdata *block, size_t len, void *data);
1210: struct blockdata *blockdata_read(int fd, size_t len);
1211: void blockdata_write(struct blockdata *block, size_t len, int fd);
1212: void blockdata_free(struct blockdata *blocks);
1213:
1214: /* domain.c */
1215: char *get_domain(struct in_addr addr);
1216: char *get_domain6(struct in6_addr *addr);
1217: int is_name_synthetic(int flags, char *name, union all_addr *addr);
1218: int is_rev_synth(int flag, union all_addr *addr, char *name);
1219:
1220: /* rfc1035.c */
1221: int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
1222: char *name, int isExtract, int extrabytes);
1223: unsigned char *skip_name(unsigned char *ansp, struct dns_header *header, size_t plen, int extrabytes);
1224: unsigned char *skip_questions(struct dns_header *header, size_t plen);
1225: unsigned char *skip_section(unsigned char *ansp, int count, struct dns_header *header, size_t plen);
1226: unsigned int extract_request(struct dns_header *header, size_t qlen,
1227: char *name, unsigned short *typep);
1228: size_t setup_reply(struct dns_header *header, size_t qlen,
1229: union all_addr *addrp, unsigned int flags,
1230: unsigned long ttl);
1231: int extract_addresses(struct dns_header *header, size_t qlen, char *name,
1232: time_t now, char **ipsets, int is_sign, int check_rebind,
1233: int no_cache_dnssec, int secure, int *doctored);
1234: size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
1235: struct in_addr local_addr, struct in_addr local_netmask,
1236: time_t now, int ad_reqd, int do_bit, int have_pseudoheader);
1237: int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
1238: struct bogus_addr *baddr, time_t now);
1239: int check_for_ignored_address(struct dns_header *header, size_t qlen, struct bogus_addr *baddr);
1240: int check_for_local_domain(char *name, time_t now);
1241: size_t resize_packet(struct dns_header *header, size_t plen,
1242: unsigned char *pheader, size_t hlen);
1243: int add_resource_record(struct dns_header *header, char *limit, int *truncp,
1244: int nameoffset, unsigned char **pp, unsigned long ttl,
1245: int *offset, unsigned short type, unsigned short class, char *format, ...);
1246: int in_arpa_name_2_addr(char *namein, union all_addr *addrp);
1247: int private_net(struct in_addr addr, int ban_localhost);
1248:
1249: /* auth.c */
1250: #ifdef HAVE_AUTH
1251: size_t answer_auth(struct dns_header *header, char *limit, size_t qlen,
1252: time_t now, union mysockaddr *peer_addr, int local_query,
1253: int do_bit, int have_pseudoheader);
1254: int in_zone(struct auth_zone *zone, char *name, char **cut);
1255: #endif
1256:
1257: /* dnssec.c */
1258: size_t dnssec_generate_query(struct dns_header *header, unsigned char *end, char *name, int class, int type, int edns_pktsz);
1259: int dnssec_validate_by_ds(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname, int class);
1260: int dnssec_validate_ds(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname, int class);
1261: int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname, int *class,
1262: int check_unsigned, int *neganswer, int *nons, int *nsec_ttl);
1263: int dnskey_keytag(int alg, int flags, unsigned char *key, int keylen);
1264: size_t filter_rrsigs(struct dns_header *header, size_t plen);
1265: int setup_timestamp(void);
1266:
1267: /* hash_questions.c */
1268: void hash_questions_init(void);
1269: unsigned char *hash_questions(struct dns_header *header, size_t plen, char *name);
1270:
1271: /* crypto.c */
1272: const struct nettle_hash *hash_find(char *name);
1273: int hash_init(const struct nettle_hash *hash, void **ctxp, unsigned char **digestp);
1274: int verify(struct blockdata *key_data, unsigned int key_len, unsigned char *sig, size_t sig_len,
1275: unsigned char *digest, size_t digest_len, int algo);
1276: char *ds_digest_name(int digest);
1277: char *algo_digest_name(int algo);
1278: char *nsec3_digest_name(int digest);
1279:
1280: /* util.c */
1281: void rand_init(void);
1282: unsigned short rand16(void);
1283: u32 rand32(void);
1284: u64 rand64(void);
1285: int legal_hostname(char *name);
1286: char *canonicalise(char *in, int *nomem);
1287: unsigned char *do_rfc1035_name(unsigned char *p, char *sval, char *limit);
1288: void *safe_malloc(size_t size);
1289: void safe_strncpy(char *dest, const char *src, size_t size);
1290: void safe_pipe(int *fd, int read_noblock);
1291: void *whine_malloc(size_t size);
1292: int sa_len(union mysockaddr *addr);
1293: int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
1294: int hostname_isequal(const char *a, const char *b);
1295: int hostname_issubdomain(char *a, char *b);
1296: time_t dnsmasq_time(void);
1297: int netmask_length(struct in_addr mask);
1298: int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
1299: int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
1300: u64 addr6part(struct in6_addr *addr);
1301: void setaddr6part(struct in6_addr *addr, u64 host);
1302: int retry_send(ssize_t rc);
1303: void prettyprint_time(char *buf, unsigned int t);
1304: int prettyprint_addr(union mysockaddr *addr, char *buf);
1305: int parse_hex(char *in, unsigned char *out, int maxlen,
1306: unsigned int *wildcard_mask, int *mac_type);
1307: int memcmp_masked(unsigned char *a, unsigned char *b, int len,
1308: unsigned int mask);
1309: int expand_buf(struct iovec *iov, size_t size);
1310: char *print_mac(char *buff, unsigned char *mac, int len);
1311: int read_write(int fd, unsigned char *packet, int size, int rw);
1312: void close_fds(long max_fd, int spare1, int spare2, int spare3);
1313: int wildcard_match(const char* wildcard, const char* match);
1314: int wildcard_matchn(const char* wildcard, const char* match, int num);
1315: #ifdef HAVE_LINUX_NETWORK
1316: int kernel_version(void);
1317: #endif
1318:
1319: /* log.c */
1320: void die(char *message, char *arg1, int exit_code) ATTRIBUTE_NORETURN;
1321: int log_start(struct passwd *ent_pw, int errfd);
1322: int log_reopen(char *log_file);
1323:
1324: void my_syslog(int priority, const char *format, ...);
1325:
1326: void set_log_writer(void);
1327: void check_log_writer(int force);
1328: void flush_log(void);
1329:
1330: /* option.c */
1331: void read_opts (int argc, char **argv, char *compile_opts);
1332: char *option_string(int prot, unsigned int opt, unsigned char *val,
1333: int opt_len, char *buf, int buf_len);
1334: void reread_dhcp(void);
1335: void read_servers_file(void);
1336: void set_option_bool(unsigned int opt);
1337: void reset_option_bool(unsigned int opt);
1338: struct hostsfile *expand_filelist(struct hostsfile *list);
1339: char *parse_server(char *arg, union mysockaddr *addr,
1340: union mysockaddr *source_addr, char *interface, int *flags);
1341: int option_read_dynfile(char *file, int flags);
1342:
1343: /* forward.c */
1344: void reply_query(int fd, int family, time_t now);
1345: void receive_query(struct listener *listen, time_t now);
1346: unsigned char *tcp_request(int confd, time_t now,
1347: union mysockaddr *local_addr, struct in_addr netmask, int auth_dns);
1348: void server_gone(struct server *server);
1349: struct frec *get_new_frec(time_t now, int *wait, struct frec *force);
1350: int send_from(int fd, int nowild, char *packet, size_t len,
1351: union mysockaddr *to, union all_addr *source,
1352: unsigned int iface);
1353: void resend_query(void);
1354: struct randfd *allocate_rfd(int family);
1355: void free_rfd(struct randfd *rfd);
1356:
1357: /* network.c */
1358: int indextoname(int fd, int index, char *name);
1359: int local_bind(int fd, union mysockaddr *addr, char *intname, unsigned int ifindex, int is_tcp);
1360: int random_sock(int family);
1361: void pre_allocate_sfds(void);
1362: int reload_servers(char *fname);
1363: void mark_servers(int flag);
1364: void cleanup_servers(void);
1365: void add_update_server(int flags,
1366: union mysockaddr *addr,
1367: union mysockaddr *source_addr,
1368: const char *interface,
1369: const char *domain);
1370: void check_servers(void);
1371: int enumerate_interfaces(int reset);
1372: void create_wildcard_listeners(void);
1373: void create_bound_listeners(int dienow);
1374: void warn_bound_listeners(void);
1375: void warn_wild_labels(void);
1376: void warn_int_names(void);
1377: int is_dad_listeners(void);
1378: int iface_check(int family, union all_addr *addr, char *name, int *auth);
1379: int loopback_exception(int fd, int family, union all_addr *addr, char *name);
1380: int label_exception(int index, int family, union all_addr *addr);
1381: int fix_fd(int fd);
1382: int tcp_interface(int fd, int af);
1383: int set_ipv6pktinfo(int fd);
1384: #ifdef HAVE_DHCP6
1385: void join_multicast(int dienow);
1386: #endif
1387: #if defined(HAVE_LINUX_NETWORK) || defined(HAVE_BSD_NETWORK)
1388: void newaddress(time_t now);
1389: #endif
1390:
1391:
1392: /* dhcp.c */
1393: #ifdef HAVE_DHCP
1394: void dhcp_init(void);
1395: void dhcp_packet(time_t now, int pxe_fd);
1396: struct dhcp_context *address_available(struct dhcp_context *context,
1397: struct in_addr taddr,
1398: struct dhcp_netid *netids);
1399: struct dhcp_context *narrow_context(struct dhcp_context *context,
1400: struct in_addr taddr,
1401: struct dhcp_netid *netids);
1402: struct ping_result *do_icmp_ping(time_t now, struct in_addr addr,
1403: unsigned int hash, int loopback);
1404: int address_allocate(struct dhcp_context *context,
1405: struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
1406: struct dhcp_netid *netids, time_t now, int loopback);
1407: void dhcp_read_ethers(void);
1408: struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
1409: char *host_from_dns(struct in_addr addr);
1410: #endif
1411:
1412: /* lease.c */
1413: #ifdef HAVE_DHCP
1414: void lease_update_file(time_t now);
1415: void lease_update_dns(int force);
1416: void lease_init(time_t now);
1417: struct dhcp_lease *lease4_allocate(struct in_addr addr);
1418: #ifdef HAVE_DHCP6
1419: struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
1420: struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
1421: int lease_type, unsigned int iaid, struct in6_addr *addr);
1422: void lease6_reset(void);
1423: struct dhcp_lease *lease6_find_by_client(struct dhcp_lease *first, int lease_type,
1424: unsigned char *clid, int clid_len, unsigned int iaid);
1425: struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
1426: u64 lease_find_max_addr6(struct dhcp_context *context);
1427: void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
1428: void lease_update_slaac(time_t now);
1429: void lease_set_iaid(struct dhcp_lease *lease, unsigned int iaid);
1430: void lease_make_duid(time_t now);
1431: #endif
1432: void lease_set_hwaddr(struct dhcp_lease *lease, const unsigned char *hwaddr,
1433: const unsigned char *clid, int hw_len, int hw_type,
1434: int clid_len, time_t now, int force);
1435: void lease_set_hostname(struct dhcp_lease *lease, const char *name, int auth, char *domain, char *config_domain);
1436: void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
1437: void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now);
1438: struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
1439: unsigned char *clid, int clid_len);
1440: struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
1441: struct in_addr lease_find_max_addr(struct dhcp_context *context);
1442: void lease_prune(struct dhcp_lease *target, time_t now);
1443: void lease_update_from_configs(void);
1444: int do_script_run(time_t now);
1445: void rerun_scripts(void);
1446: void lease_find_interfaces(time_t now);
1447: #ifdef HAVE_SCRIPT
1448: void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
1449: unsigned int len, int delim);
1450: #endif
1451: #endif
1452:
1453: /* rfc2131.c */
1454: #ifdef HAVE_DHCP
1455: size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
1456: size_t sz, time_t now, int unicast_dest, int loopback,
1457: int *is_inform, int pxe, struct in_addr fallback, time_t recvtime);
1458: unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
1459: int clid_len, unsigned char *clid, int *len_out);
1460: #endif
1461:
1462: /* dnsmasq.c */
1463: #ifdef HAVE_DHCP
1464: int make_icmp_sock(void);
1465: int icmp_ping(struct in_addr addr);
1466: int delay_dhcp(time_t start, int sec, int fd, uint32_t addr, unsigned short id);
1467: #endif
1468: void queue_event(int event);
1469: void send_alarm(time_t event, time_t now);
1470: void send_event(int fd, int event, int data, char *msg);
1471: void clear_cache_and_reload(time_t now);
1472:
1473: /* netlink.c */
1474: #ifdef HAVE_LINUX_NETWORK
1475: char *netlink_init(void);
1476: void netlink_multicast(void);
1477: #endif
1478:
1479: /* bpf.c */
1480: #ifdef HAVE_BSD_NETWORK
1481: void init_bpf(void);
1482: void send_via_bpf(struct dhcp_packet *mess, size_t len,
1483: struct in_addr iface_addr, struct ifreq *ifr);
1484: void route_init(void);
1485: void route_sock(void);
1486: #endif
1487:
1488: /* bpf.c or netlink.c */
1489: int iface_enumerate(int family, void *parm, int (callback)());
1490:
1491: /* dbus.c */
1492: #ifdef HAVE_DBUS
1493: char *dbus_init(void);
1494: void check_dbus_listeners(void);
1495: void set_dbus_listeners(void);
1496: # ifdef HAVE_DHCP
1497: void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
1498: # endif
1499: #endif
1500:
1501: /* ubus.c */
1502: #ifdef HAVE_UBUS
1503: void ubus_init(void);
1504: void set_ubus_listeners(void);
1505: void check_ubus_listeners(void);
1506: void ubus_event_bcast(const char *type, const char *mac, const char *ip, const char *name, const char *interface);
1507: #endif
1508:
1509: /* ipset.c */
1510: #ifdef HAVE_IPSET
1511: void ipset_init(void);
1512: int add_to_ipset(const char *setname, const union all_addr *ipaddr, int flags, int remove);
1513: #endif
1514:
1515: /* helper.c */
1516: #if defined(HAVE_SCRIPT)
1517: int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
1518: void helper_write(void);
1519: void queue_script(int action, struct dhcp_lease *lease,
1520: char *hostname, time_t now);
1521: #ifdef HAVE_TFTP
1522: void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer);
1523: #endif
1524: void queue_arp(int action, unsigned char *mac, int maclen,
1525: int family, union all_addr *addr);
1526: int helper_buf_empty(void);
1527: #endif
1528:
1529: /* tftp.c */
1530: #ifdef HAVE_TFTP
1531: void tftp_request(struct listener *listen, time_t now);
1532: void check_tftp_listeners(time_t now);
1533: int do_tftp_script_run(void);
1534: #endif
1535:
1536: /* conntrack.c */
1537: #ifdef HAVE_CONNTRACK
1538: int get_incoming_mark(union mysockaddr *peer_addr, union all_addr *local_addr,
1539: int istcp, unsigned int *markp);
1540: #endif
1541:
1542: /* dhcp6.c */
1543: #ifdef HAVE_DHCP6
1544: void dhcp6_init(void);
1545: void dhcp6_packet(time_t now);
1546: struct dhcp_context *address6_allocate(struct dhcp_context *context, unsigned char *clid, int clid_len, int temp_addr,
1547: unsigned int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans);
1548: struct dhcp_context *address6_available(struct dhcp_context *context,
1549: struct in6_addr *taddr,
1550: struct dhcp_netid *netids,
1551: int plain_range);
1552: struct dhcp_context *address6_valid(struct dhcp_context *context,
1553: struct in6_addr *taddr,
1554: struct dhcp_netid *netids,
1555: int plain_range);
1556: struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1557: int prefix, struct in6_addr *addr);
1558: void make_duid(time_t now);
1559: void dhcp_construct_contexts(time_t now);
1560: void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac,
1561: unsigned int *maclenp, unsigned int *mactypep, time_t now);
1562: #endif
1563:
1564: /* rfc3315.c */
1565: #ifdef HAVE_DHCP6
1566: unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1567: struct in6_addr *fallback, struct in6_addr *ll_addr, struct in6_addr *ula_addr,
1568: size_t sz, struct in6_addr *client_addr, time_t now);
1569: void relay_upstream6(struct dhcp_relay *relay, ssize_t sz, struct in6_addr *peer_address,
1570: u32 scope_id, time_t now);
1571:
1572: unsigned short relay_reply6( struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface);
1573: #endif
1574:
1575: /* dhcp-common.c */
1576: #ifdef HAVE_DHCP
1577: void dhcp_common_init(void);
1578: ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1579: struct dhcp_netid *run_tag_if(struct dhcp_netid *tags);
1580: struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1581: struct dhcp_opt *opts);
1582: int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int tagnotneeded);
1583: char *strip_hostname(char *hostname);
1584: void log_tags(struct dhcp_netid *netid, u32 xid);
1585: int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1586: void dhcp_update_configs(struct dhcp_config *configs);
1587: void display_opts(void);
1588: int lookup_dhcp_opt(int prot, char *name);
1589: int lookup_dhcp_len(int prot, int val);
1590: struct dhcp_config *find_config(struct dhcp_config *configs,
1591: struct dhcp_context *context,
1592: unsigned char *clid, int clid_len,
1593: unsigned char *hwaddr, int hw_len,
1594: int hw_type, char *hostname,
1595: struct dhcp_netid *filter);
1596: int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
1597: #ifdef HAVE_LINUX_NETWORK
1598: char *whichdevice(void);
1599: void bindtodevice(char *device, int fd);
1600: #endif
1601: # ifdef HAVE_DHCP6
1602: void display_opts6(void);
1603: # endif
1604: void log_context(int family, struct dhcp_context *context);
1605: void log_relay(int family, struct dhcp_relay *relay);
1606: #endif
1607:
1608: /* outpacket.c */
1609: #ifdef HAVE_DHCP6
1610: void end_opt6(int container);
1611: void reset_counter(void);
1612: int save_counter(int newval);
1613: void *expand(size_t headroom);
1614: int new_opt6(int opt);
1615: void *put_opt6(void *data, size_t len);
1616: void put_opt6_long(unsigned int val);
1617: void put_opt6_short(unsigned int val);
1618: void put_opt6_char(unsigned int val);
1619: void put_opt6_string(char *s);
1620: #endif
1621:
1622: /* radv.c */
1623: #ifdef HAVE_DHCP6
1624: void ra_init(time_t now);
1625: void icmp6_packet(time_t now);
1626: time_t periodic_ra(time_t now);
1627: void ra_start_unsolicited(time_t now, struct dhcp_context *context);
1628: #endif
1629:
1630: /* slaac.c */
1631: #ifdef HAVE_DHCP6
1632: void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force);
1633: time_t periodic_slaac(time_t now, struct dhcp_lease *leases);
1634: void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases);
1635: #endif
1636:
1637: /* loop.c */
1638: #ifdef HAVE_LOOP
1639: void loop_send_probes(void);
1640: int detect_loop(char *query, int type);
1641: #endif
1642:
1643: /* inotify.c */
1644: #ifdef HAVE_INOTIFY
1645: void inotify_dnsmasq_init(void);
1646: int inotify_check(time_t now);
1647: void set_dynamic_inotify(int flag, int total_size, struct crec **rhash, int revhashsz);
1648: #endif
1649:
1650: /* poll.c */
1651: void poll_reset(void);
1652: int poll_check(int fd, short event);
1653: void poll_listen(int fd, short event);
1654: int do_poll(int timeout);
1655:
1656: /* rrfilter.c */
1657: size_t rrfilter(struct dns_header *header, size_t plen, int mode);
1658: u16 *rrfilter_desc(int type);
1659: int expand_workspace(unsigned char ***wkspc, int *szp, int new);
1660:
1661: /* edns0.c */
1662: unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
1663: size_t *len, unsigned char **p, int *is_sign, int *is_last);
1664: size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *limit,
1665: unsigned short udp_sz, int optno, unsigned char *opt, size_t optlen, int set_do, int replace);
1666: size_t add_do_bit(struct dns_header *header, size_t plen, unsigned char *limit);
1667: size_t add_edns0_config(struct dns_header *header, size_t plen, unsigned char *limit,
1668: union mysockaddr *source, time_t now, int *check_subnet, int *cacheable);
1669: int check_source(struct dns_header *header, size_t plen, unsigned char *pseudoheader, union mysockaddr *peer);
1670:
1671: /* arp.c */
1672: int find_mac(union mysockaddr *addr, unsigned char *mac, int lazy, time_t now);
1673: int do_arp_script_run(void);
1674:
1675: /* dump.c */
1676: #ifdef HAVE_DUMPFILE
1677: void dump_init(void);
1678: void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, union mysockaddr *dst);
1679: #endif
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