src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2015 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) 2000-2015 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 #include "ip6addr.h"
  54
  55 typedef unsigned char u8;
  56 typedef unsigned short u16;
  57 typedef unsigned int u32;
  58 typedef unsigned long long u64;
  59
  60 #define countof(x)      (long)(sizeof(x) / sizeof(x[0]))
  61 #define MIN(a,b)        ((a) < (b) ? (a) : (b))
  62
  63 #include "dns-protocol.h"
  64 #include "dhcp-protocol.h"
  65 #ifdef HAVE_DHCP6
  66 #include "dhcp6-protocol.h"
  67 #include "radv-protocol.h"
  68 #endif
  69
  70 #define gettext_noop(S) (S)
  71 #ifndef LOCALEDIR
  72 #  define _(S) (S)
  73 #else
  74 #  include <libintl.h>
  75 #  include <locale.h>
  76 #  define _(S) gettext(S)
  77 #endif
  78
  79 #include <arpa/inet.h>
  80 #include <sys/stat.h>
  81 #include <sys/ioctl.h>
  82 #if defined(HAVE_SOLARIS_NETWORK)
  83 #  include <sys/sockio.h>
  84 #endif
  85 #include <sys/poll.h>
  86 #include <sys/wait.h>
  87 #include <sys/time.h>
  88 #include <sys/un.h>
  89 #include <limits.h>
  90 #include <net/if.h>
  91 #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu)
  92 /* Some solaris net/if./h omit this. */
  93 #  define ifr_mtu  ifr_ifru.ifru_metric
  94 #endif
  95 #include <unistd.h>
  96 #include <stdio.h>
  97 #include <string.h>
  98 #include <stdlib.h>
  99 #include <fcntl.h>
 100 #include <ctype.h>
 101 #include <signal.h>
 102 #include <stddef.h>
 103 #include <time.h>
 104 #include <errno.h>
 105 #include <pwd.h>
 106 #include <grp.h>
 107 #include <stdarg.h>
 108 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__)
 109 #  include <netinet/if_ether.h>
 110 #else
 111 #  include <net/ethernet.h>
 112 #endif
 113 #include <net/if_arp.h>
 114 #include <netinet/in_systm.h>
 115 #include <netinet/ip.h>
 116 #include <netinet/ip_icmp.h>
 117 #include <sys/uio.h>
 118 #include <syslog.h>
 119 #include <dirent.h>
 120 #ifndef HAVE_LINUX_NETWORK
 121 #  include <net/if_dl.h>
 122 #endif
 123
 124 #if defined(HAVE_LINUX_NETWORK)
 125 #include <linux/capability.h>
 126 /* There doesn't seem to be a universally-available
 127    userpace header for these. */
 128 extern int capset(cap_user_header_t header, cap_user_data_t data);
 129 extern int capget(cap_user_header_t header, cap_user_data_t data);
 130 #define LINUX_CAPABILITY_VERSION_1  0x19980330
 131 #define LINUX_CAPABILITY_VERSION_2  0x20071026
 132 #define LINUX_CAPABILITY_VERSION_3  0x20080522
 133
 134 #include <sys/prctl.h>
 135 #elif defined(HAVE_SOLARIS_NETWORK)
 136 #include <priv.h>
 137 #endif
 138
 139 /* daemon is function in the C library.... */
 140 #define daemon dnsmasq_daemon
 141
 142 /* Async event queue */
 143 struct event_desc {
 144   int event, data, msg_sz;
 145 };
 146
 147 #define EVENT_RELOAD    1
 148 #define EVENT_DUMP      2
 149 #define EVENT_ALARM     3
 150 #define EVENT_TERM      4
 151 #define EVENT_CHILD     5
 152 #define EVENT_REOPEN    6
 153 #define EVENT_EXITED    7
 154 #define EVENT_KILLED    8
 155 #define EVENT_EXEC_ERR  9
 156 #define EVENT_PIPE_ERR  10
 157 #define EVENT_USER_ERR  11
 158 #define EVENT_CAP_ERR   12
 159 #define EVENT_PIDFILE   13
 160 #define EVENT_HUSER_ERR 14
 161 #define EVENT_GROUP_ERR 15
 162 #define EVENT_DIE       16
 163 #define EVENT_LOG_ERR   17
 164 #define EVENT_FORK_ERR  18
 165 #define EVENT_LUA_ERR   19
 166 #define EVENT_TFTP_ERR  20
 167 #define EVENT_INIT      21
 168 #define EVENT_NEWADDR   22
 169 #define EVENT_NEWROUTE  23
 170 #define EVENT_TIME_ERR  24
 171
 172 /* Exit codes. */
 173 #define EC_GOOD        0
 174 #define EC_BADCONF     1
 175 #define EC_BADNET      2
 176 #define EC_FILE        3
 177 #define EC_NOMEM       4
 178 #define EC_MISC        5
 179 #define EC_INIT_OFFSET 10
 180
 181 /* Min buffer size: we check after adding each record, so there must be
 182    memory for the largest packet, and the largest record so the
 183    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 184    This might be increased is EDNS packet size if greater than the minimum.
 185 */
 186 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 187
 188 /* Trust the compiler dead-code eliminator.... */
 189 #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
 190
 191 #define OPT_BOGUSPRIV      0
 192 #define OPT_FILTER         1
 193 #define OPT_LOG            2
 194 #define OPT_SELFMX         3
 195 #define OPT_NO_HOSTS       4
 196 #define OPT_NO_POLL        5
 197 #define OPT_DEBUG          6
 198 #define OPT_ORDER          7
 199 #define OPT_NO_RESOLV      8
 200 #define OPT_EXPAND         9
 201 #define OPT_LOCALMX        10
 202 #define OPT_NO_NEG         11
 203 #define OPT_NODOTS_LOCAL   12
 204 #define OPT_NOWILD         13
 205 #define OPT_ETHERS         14
 206 #define OPT_RESOLV_DOMAIN  15
 207 #define OPT_NO_FORK        16
 208 #define OPT_AUTHORITATIVE  17
 209 #define OPT_LOCALISE       18
 210 #define OPT_DBUS           19
 211 #define OPT_DHCP_FQDN      20
 212 #define OPT_NO_PING        21
 213 #define OPT_LEASE_RO       22
 214 #define OPT_ALL_SERVERS    23
 215 #define OPT_RELOAD         24
 216 #define OPT_LOCAL_REBIND   25
 217 #define OPT_TFTP_SECURE    26
 218 #define OPT_TFTP_NOBLOCK   27
 219 #define OPT_LOG_OPTS       28
 220 #define OPT_TFTP_APREF     29
 221 #define OPT_NO_OVERRIDE    30
 222 #define OPT_NO_REBIND      31
 223 #define OPT_ADD_MAC        32
 224 #define OPT_DNSSEC_PROXY   33
 225 #define OPT_CONSEC_ADDR    34
 226 #define OPT_CONNTRACK      35
 227 #define OPT_FQDN_UPDATE    36
 228 #define OPT_RA             37
 229 #define OPT_TFTP_LC        38
 230 #define OPT_CLEVERBIND     39
 231 #define OPT_TFTP           40
 232 #define OPT_CLIENT_SUBNET  41
 233 #define OPT_QUIET_DHCP     42
 234 #define OPT_QUIET_DHCP6    43
 235 #define OPT_QUIET_RA       44
 236 #define OPT_DNSSEC_VALID   45
 237 #define OPT_DNSSEC_TIME    46
 238 #define OPT_DNSSEC_DEBUG   47
 239 #define OPT_DNSSEC_NO_SIGN 48
 240 #define OPT_LOCAL_SERVICE  49
 241 #define OPT_LOOP_DETECT    50
 242 #define OPT_EXTRALOG       51
 243 #define OPT_TFTP_NO_FAIL   52
 244 #define OPT_LAST           53
 245
 246 /* extra flags for my_syslog, we use a couple of facilities since they are known
 247    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 248 #define MS_TFTP LOG_USER
 249 #define MS_DHCP LOG_DAEMON
 250
 251 struct all_addr {
 252   union {
 253     struct in_addr addr4;
 254 #ifdef HAVE_IPV6
 255     struct in6_addr addr6;
 256 #endif
 257     /* for log_query */
 258     unsigned int keytag;
 259     /* for cache_insert if RRSIG, DNSKEY, DS */
 260     struct {
 261       unsigned short class, type;
 262     } dnssec;
 263   } addr;
 264 };
 265
 266 struct bogus_addr {
 267   struct in_addr addr;
 268   struct bogus_addr *next;
 269 };
 270
 271 /* dns doctor param */
 272 struct doctor {
 273   struct in_addr in, end, out, mask;
 274   struct doctor *next;
 275 };
 276
 277 struct mx_srv_record {
 278   char *name, *target;
 279   int issrv, srvport, priority, weight;
 280   unsigned int offset;
 281   struct mx_srv_record *next;
 282 };
 283
 284 struct naptr {
 285   char *name, *replace, *regexp, *services, *flags;
 286   unsigned int order, pref;
 287   struct naptr *next;
 288 };
 289
 290 #define TXT_STAT_CACHESIZE     1
 291 #define TXT_STAT_INSERTS       2
 292 #define TXT_STAT_EVICTIONS     3
 293 #define TXT_STAT_MISSES        4
 294 #define TXT_STAT_HITS          5
 295 #define TXT_STAT_AUTH          6
 296 #define TXT_STAT_SERVERS       7
 297
 298 struct txt_record {
 299   char *name;
 300   unsigned char *txt;
 301   unsigned short class, len;
 302   int stat;
 303   struct txt_record *next;
 304 };
 305
 306 struct ptr_record {
 307   char *name, *ptr;
 308   struct ptr_record *next;
 309 };
 310
 311 struct cname {
 312   char *alias, *target;
 313   struct cname *next;
 314 };
 315
 316 struct ds_config {
 317   char *name, *digest;
 318   int digestlen, class, algo, keytag, digest_type;
 319   struct ds_config *next;
 320 };
 321
 322 #define ADDRLIST_LITERAL 1
 323 #define ADDRLIST_IPV6    2
 324 #define ADDRLIST_REVONLY 4
 325
 326 struct addrlist {
 327   struct all_addr addr;
 328   int flags, prefixlen;
 329   struct addrlist *next;
 330 };
 331
 332 #define AUTH6     1
 333 #define AUTH4     2
 334
 335 struct auth_zone {
 336   char *domain;
 337   struct auth_name_list {
 338     char *name;
 339     int flags;
 340     struct auth_name_list *next;
 341   } *interface_names;
 342   struct addrlist *subnet;
 343   struct auth_zone *next;
 344 };
 345
 346
 347 struct host_record {
 348   struct name_list {
 349     char *name;
 350     struct name_list *next;
 351   } *names;
 352   struct in_addr addr;
 353 #ifdef HAVE_IPV6
 354   struct in6_addr addr6;
 355 #endif
 356   struct host_record *next;
 357 };
 358
 359 struct interface_name {
 360   char *name; /* domain name */
 361   char *intr; /* interface name */
 362   int family; /* AF_INET, AF_INET6 or zero for both */
 363   struct addrlist *addr;
 364   struct interface_name *next;
 365 };
 366
 367 union bigname {
 368   char name[MAXDNAME];
 369   union bigname *next; /* freelist */
 370 };
 371
 372 struct blockdata {
 373   struct blockdata *next;
 374   unsigned char key[KEYBLOCK_LEN];
 375 };
 376
 377 struct crec {
 378   struct crec *next, *prev, *hash_next;
 379   /* union is 16 bytes when doing IPv6, 8 bytes on 32 bit machines without IPv6 */
 380   union {
 381     struct all_addr addr;
 382     struct {
 383       union {
 384         struct crec *cache;
 385         struct interface_name *int_name;
 386       } target;
 387       unsigned int uid; /* 0 if union is interface-name */
 388     } cname;
 389     struct {
 390       struct blockdata *keydata;
 391       unsigned short keylen, flags, keytag;
 392       unsigned char algo;
 393     } key;
 394     struct {
 395       struct blockdata *keydata;
 396       unsigned short keylen, keytag;
 397       unsigned char algo;
 398       unsigned char digest;
 399     } ds;
 400     struct {
 401       struct blockdata *keydata;
 402       unsigned short keylen, type_covered, keytag;
 403       char algo;
 404     } sig;
 405   } addr;
 406   time_t ttd; /* time to die */
 407   /* used as class if DNSKEY/DS/RRSIG, index to source for F_HOSTS */
 408   unsigned int uid;
 409   unsigned short flags;
 410   union {
 411     char sname[SMALLDNAME];
 412     union bigname *bname;
 413     char *namep;
 414   } name;
 415 };
 416
 417 #define F_IMMORTAL  (1u<<0)
 418 #define F_NAMEP     (1u<<1)
 419 #define F_REVERSE   (1u<<2)
 420 #define F_FORWARD   (1u<<3)
 421 #define F_DHCP      (1u<<4)
 422 #define F_NEG       (1u<<5)
 423 #define F_HOSTS     (1u<<6)
 424 #define F_IPV4      (1u<<7)
 425 #define F_IPV6      (1u<<8)
 426 #define F_BIGNAME   (1u<<9)
 427 #define F_NXDOMAIN  (1u<<10)
 428 #define F_CNAME     (1u<<11)
 429 #define F_DNSKEY    (1u<<12)
 430 #define F_CONFIG    (1u<<13)
 431 #define F_DS        (1u<<14)
 432 #define F_DNSSECOK  (1u<<15)
 433
 434 /* below here are only valid as args to log_query: cache
 435    entries are limited to 16 bits */
 436 #define F_UPSTREAM  (1u<<16)
 437 #define F_RRNAME    (1u<<17)
 438 #define F_SERVER    (1u<<18)
 439 #define F_QUERY     (1u<<19)
 440 #define F_NOERR     (1u<<20)
 441 #define F_AUTH      (1u<<21)
 442 #define F_DNSSEC    (1u<<22)
 443 #define F_KEYTAG    (1u<<23)
 444 #define F_SECSTAT   (1u<<24)
 445 #define F_NO_RR     (1u<<25)
 446 #define F_IPSET     (1u<<26)
 447 #define F_NSIGMATCH (1u<<27)
 448 #define F_NOEXTRA   (1u<<28)
 449
 450 /* Values of uid in crecs with F_CONFIG bit set. */
 451 #define SRC_INTERFACE 0
 452 #define SRC_CONFIG    1
 453 #define SRC_HOSTS     2
 454 #define SRC_AH        3
 455
 456
 457 /* struct sockaddr is not large enough to hold any address,
 458    and specifically not big enough to hold an IPv6 address.
 459    Blech. Roll our own. */
 460 union mysockaddr {
 461   struct sockaddr sa;
 462   struct sockaddr_in in;
 463 #if defined(HAVE_IPV6)
 464   struct sockaddr_in6 in6;
 465 #endif
 466 };
 467
 468 /* bits in flag param to IPv6 callbacks from iface_enumerate() */
 469 #define IFACE_TENTATIVE   1
 470 #define IFACE_DEPRECATED  2
 471 #define IFACE_PERMANENT   4
 472
 473
 474 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 475 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 476 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 477 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 478 #define SERV_HAS_SOURCE       16  /* source address defined */
 479 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 480 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 481 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 482 #define SERV_MARK            256  /* for mark-and-delete */
 483 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 484 #define SERV_COUNTED         512  /* workspace for log code */
 485 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 486 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 487 #define SERV_FROM_FILE      4096  /* read from --servers-file */
 488 #define SERV_LOOP           8192  /* server causes forwarding loop */
 489
 490 struct serverfd {
 491   int fd;
 492   union mysockaddr source_addr;
 493   char interface[IF_NAMESIZE+1];
 494   struct serverfd *next;
 495 };
 496
 497 struct randfd {
 498   int fd;
 499   unsigned short refcount, family;
 500 };
 501
 502 struct server {
 503   union mysockaddr addr, source_addr;
 504   char interface[IF_NAMESIZE+1];
 505   struct serverfd *sfd;
 506   char *domain; /* set if this server only handles a domain. */
 507   int flags, tcpfd, edns_pktsz;
 508   unsigned int queries, failed_queries;
 509 #ifdef HAVE_LOOP
 510   u32 uid;
 511 #endif
 512   struct server *next;
 513 };
 514
 515 struct ipsets {
 516   char **sets;
 517   char *domain;
 518   struct ipsets *next;
 519 };
 520
 521 struct irec {
 522   union mysockaddr addr;
 523   struct in_addr netmask; /* only valid for IPv4 */
 524   int tftp_ok, dhcp_ok, mtu, done, warned, dad, dns_auth, index, multicast_done, found;
 525   char *name;
 526   struct irec *next;
 527 };
 528
 529 struct listener {
 530   int fd, tcpfd, tftpfd, family;
 531   struct irec *iface; /* only sometimes valid for non-wildcard */
 532   struct listener *next;
 533 };
 534
 535 /* interface and address parms from command line. */
 536 struct iname {
 537   char *name;
 538   union mysockaddr addr;
 539   int used;
 540   struct iname *next;
 541 };
 542
 543 /* resolv-file parms from command-line */
 544 struct resolvc {
 545   struct resolvc *next;
 546   int is_default, logged;
 547   time_t mtime;
 548   char *name;
 549 #ifdef HAVE_INOTIFY
 550   int wd; /* inotify watch descriptor */
 551   char *file; /* pointer to file part if path */
 552 #endif
 553 };
 554
 555 /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile and dhcp-hostsdir*/
 556 #define AH_DIR      1
 557 #define AH_INACTIVE 2
 558 #define AH_WD_DONE  4
 559 #define AH_HOSTS    8
 560 #define AH_DHCP_HST 16
 561 #define AH_DHCP_OPT 32
 562 struct hostsfile {
 563   struct hostsfile *next;
 564   int flags;
 565   char *fname;
 566 #ifdef HAVE_INOTIFY
 567   int wd; /* inotify watch descriptor */
 568 #endif
 569   unsigned int index; /* matches to cache entries for logging */
 570 };
 571
 572
 573 /* DNSSEC status values. */
 574 #define STAT_SECURE             1
 575 #define STAT_INSECURE           2
 576 #define STAT_BOGUS              3
 577 #define STAT_NEED_DS            4
 578 #define STAT_NEED_KEY           5
 579 #define STAT_TRUNCATED          6
 580 #define STAT_SECURE_WILDCARD    7
 581 #define STAT_NO_SIG             8
 582 #define STAT_NO_DS              9
 583 #define STAT_NO_NS             10
 584 #define STAT_NEED_DS_NEG       11
 585 #define STAT_CHASE_CNAME       12
 586 #define STAT_INSECURE_DS       13
 587
 588 #define FREC_NOREBIND           1
 589 #define FREC_CHECKING_DISABLED  2
 590 #define FREC_HAS_SUBNET         4
 591 #define FREC_DNSKEY_QUERY       8
 592 #define FREC_DS_QUERY          16
 593 #define FREC_AD_QUESTION       32
 594 #define FREC_DO_QUESTION       64
 595 #define FREC_ADDED_PHEADER    128
 596 #define FREC_CHECK_NOSIGN     256
 597 #define FREC_TEST_PKTSZ       512
 598
 599 #ifdef HAVE_DNSSEC
 600 #define HASH_SIZE 20 /* SHA-1 digest size */
 601 #else
 602 #define HASH_SIZE sizeof(int)
 603 #endif
 604
 605 struct frec {
 606   union mysockaddr source;
 607   struct all_addr dest;
 608   struct server *sentto; /* NULL means free */
 609   struct randfd *rfd4;
 610 #ifdef HAVE_IPV6
 611   struct randfd *rfd6;
 612 #endif
 613   unsigned int iface;
 614   unsigned short orig_id, new_id;
 615   int log_id, fd, forwardall, flags;
 616   time_t time;
 617   unsigned char *hash[HASH_SIZE];
 618 #ifdef HAVE_DNSSEC
 619   int class, work_counter;
 620   struct blockdata *stash; /* Saved reply, whilst we validate */
 621   struct blockdata *orig_domain; /* domain of original query, whilst
 622                                     we're seeing is if in unsigned domain */
 623   size_t stash_len, name_start, name_len;
 624   struct frec *dependent; /* Query awaiting internally-generated DNSKEY or DS query */
 625   struct frec *blocking_query; /* Query which is blocking us. */
 626 #endif
 627   struct frec *next;
 628 };
 629
 630 /* flags in top of length field for DHCP-option tables */
 631 #define OT_ADDR_LIST    0x8000
 632 #define OT_RFC1035_NAME 0x4000
 633 #define OT_INTERNAL     0x2000
 634 #define OT_NAME         0x1000
 635 #define OT_CSTRING      0x0800
 636 #define OT_DEC          0x0400
 637 #define OT_TIME         0x0200
 638
 639 /* actions in the daemon->helper RPC */
 640 #define ACTION_DEL           1
 641 #define ACTION_OLD_HOSTNAME  2
 642 #define ACTION_OLD           3
 643 #define ACTION_ADD           4
 644 #define ACTION_TFTP          5
 645
 646 #define LEASE_NEW            1  /* newly created */
 647 #define LEASE_CHANGED        2  /* modified */
 648 #define LEASE_AUX_CHANGED    4  /* CLID or expiry changed */
 649 #define LEASE_AUTH_NAME      8  /* hostname came from config, not from client */
 650 #define LEASE_USED          16  /* used this DHCPv6 transaction */
 651 #define LEASE_NA            32  /* IPv6 no-temporary lease */
 652 #define LEASE_TA            64  /* IPv6 temporary lease */
 653 #define LEASE_HAVE_HWADDR  128  /* Have set hwaddress */
 654
 655 struct dhcp_lease {
 656   int clid_len;          /* length of client identifier */
 657   unsigned char *clid;   /* clientid */
 658   char *hostname, *fqdn; /* name from client-hostname option or config */
 659   char *old_hostname;    /* hostname before it moved to another lease */
 660   int flags;
 661   time_t expires;        /* lease expiry */
 662 #ifdef HAVE_BROKEN_RTC
 663   unsigned int length;
 664 #endif
 665   int hwaddr_len, hwaddr_type;
 666   unsigned char hwaddr[DHCP_CHADDR_MAX];
 667   struct in_addr addr, override, giaddr;
 668   unsigned char *extradata;
 669   unsigned int extradata_len, extradata_size;
 670   int last_interface;
 671   int new_interface;     /* save possible originated interface */
 672   int new_prefixlen;     /* and its prefix length */
 673 #ifdef HAVE_DHCP6
 674   struct in6_addr addr6;
 675   int iaid;
 676   struct slaac_address {
 677     struct in6_addr addr;
 678     time_t ping_time;
 679     int backoff; /* zero -> confirmed */
 680     struct slaac_address *next;
 681   } *slaac_address;
 682   int vendorclass_count;
 683 #endif
 684   struct dhcp_lease *next;
 685 };
 686
 687 struct dhcp_netid {
 688   char *net;
 689   struct dhcp_netid *next;
 690 };
 691
 692 struct dhcp_netid_list {
 693   struct dhcp_netid *list;
 694   struct dhcp_netid_list *next;
 695 };
 696
 697 struct tag_if {
 698   struct dhcp_netid_list *set;
 699   struct dhcp_netid *tag;
 700   struct tag_if *next;
 701 };
 702
 703 struct hwaddr_config {
 704   int hwaddr_len, hwaddr_type;
 705   unsigned char hwaddr[DHCP_CHADDR_MAX];
 706   unsigned int wildcard_mask;
 707   struct hwaddr_config *next;
 708 };
 709
 710 struct dhcp_config {
 711   unsigned int flags;
 712   int clid_len;          /* length of client identifier */
 713   unsigned char *clid;   /* clientid */
 714   char *hostname, *domain;
 715   struct dhcp_netid_list *netid;
 716 #ifdef HAVE_DHCP6
 717   struct in6_addr addr6;
 718 #endif
 719   struct in_addr addr;
 720   time_t decline_time;
 721   unsigned int lease_time;
 722   struct hwaddr_config *hwaddr;
 723   struct dhcp_config *next;
 724 };
 725
 726 #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
 727
 728 #define CONFIG_DISABLE           1
 729 #define CONFIG_CLID              2
 730 #define CONFIG_TIME              8
 731 #define CONFIG_NAME             16
 732 #define CONFIG_ADDR             32
 733 #define CONFIG_NOCLID          128
 734 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 735 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 736 #define CONFIG_DECLINED       1024    /* address declined by client */
 737 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 738 #define CONFIG_ADDR6          4096
 739 #define CONFIG_WILDCARD       8192
 740
 741 struct dhcp_opt {
 742   int opt, len, flags;
 743   union {
 744     int encap;
 745     unsigned int wildcard_mask;
 746     unsigned char *vendor_class;
 747   } u;
 748   unsigned char *val;
 749   struct dhcp_netid *netid;
 750   struct dhcp_opt *next;
 751 };
 752
 753 #define DHOPT_ADDR               1
 754 #define DHOPT_STRING             2
 755 #define DHOPT_ENCAPSULATE        4
 756 #define DHOPT_ENCAP_MATCH        8
 757 #define DHOPT_FORCE             16
 758 #define DHOPT_BANK              32
 759 #define DHOPT_ENCAP_DONE        64
 760 #define DHOPT_MATCH            128
 761 #define DHOPT_VENDOR           256
 762 #define DHOPT_HEX              512
 763 #define DHOPT_VENDOR_MATCH    1024
 764 #define DHOPT_RFC3925         2048
 765 #define DHOPT_TAGOK           4096
 766 #define DHOPT_ADDR6           8192
 767
 768 struct dhcp_boot {
 769   char *file, *sname, *tftp_sname;
 770   struct in_addr next_server;
 771   struct dhcp_netid *netid;
 772   struct dhcp_boot *next;
 773 };
 774
 775 struct pxe_service {
 776   unsigned short CSA, type;
 777   char *menu, *basename, *sname;
 778   struct in_addr server;
 779   struct dhcp_netid *netid;
 780   struct pxe_service *next;
 781 };
 782
 783 #define MATCH_VENDOR     1
 784 #define MATCH_USER       2
 785 #define MATCH_CIRCUIT    3
 786 #define MATCH_REMOTE     4
 787 #define MATCH_SUBSCRIBER 5
 788
 789 /* vendorclass, userclass, remote-id or cicuit-id */
 790 struct dhcp_vendor {
 791   int len, match_type;
 792   unsigned int enterprise;
 793   char *data;
 794   struct dhcp_netid netid;
 795   struct dhcp_vendor *next;
 796 };
 797
 798 struct dhcp_mac {
 799   unsigned int mask;
 800   int hwaddr_len, hwaddr_type;
 801   unsigned char hwaddr[DHCP_CHADDR_MAX];
 802   struct dhcp_netid netid;
 803   struct dhcp_mac *next;
 804 };
 805
 806 struct dhcp_bridge {
 807   char iface[IF_NAMESIZE];
 808   struct dhcp_bridge *alias, *next;
 809 };
 810
 811 struct cond_domain {
 812   char *domain, *prefix;
 813   struct in_addr start, end;
 814 #ifdef HAVE_IPV6
 815   struct in6_addr start6, end6;
 816 #endif
 817   int is6;
 818   struct cond_domain *next;
 819 };
 820
 821 #ifdef OPTION6_PREFIX_CLASS
 822 struct prefix_class {
 823   int class;
 824   struct dhcp_netid tag;
 825   struct prefix_class *next;
 826 };
 827 #endif
 828
 829 struct ra_interface {
 830   char *name;
 831   int interval, lifetime, prio;
 832   struct ra_interface *next;
 833 };
 834
 835 struct dhcp_context {
 836   unsigned int lease_time, addr_epoch;
 837   struct in_addr netmask, broadcast;
 838   struct in_addr local, router;
 839   struct in_addr start, end; /* range of available addresses */
 840 #ifdef HAVE_DHCP6
 841   struct in6_addr start6, end6; /* range of available addresses */
 842   struct in6_addr local6;
 843   int prefix, if_index;
 844   unsigned int valid, preferred, saved_valid;
 845   time_t ra_time, ra_short_period_start, address_lost_time;
 846   char *template_interface;
 847 #endif
 848   int flags;
 849   struct dhcp_netid netid, *filter;
 850   struct dhcp_context *next, *current;
 851 };
 852
 853 #define CONTEXT_STATIC         (1u<<0)
 854 #define CONTEXT_NETMASK        (1u<<1)
 855 #define CONTEXT_BRDCAST        (1u<<2)
 856 #define CONTEXT_PROXY          (1u<<3)
 857 #define CONTEXT_RA_ROUTER      (1u<<4)
 858 #define CONTEXT_RA_DONE        (1u<<5)
 859 #define CONTEXT_RA_NAME        (1u<<6)
 860 #define CONTEXT_RA_STATELESS   (1u<<7)
 861 #define CONTEXT_DHCP           (1u<<8)
 862 #define CONTEXT_DEPRECATE      (1u<<9)
 863 #define CONTEXT_TEMPLATE       (1u<<10)    /* create contexts using addresses */
 864 #define CONTEXT_CONSTRUCTED    (1u<<11)
 865 #define CONTEXT_GC             (1u<<12)
 866 #define CONTEXT_RA             (1u<<13)
 867 #define CONTEXT_CONF_USED      (1u<<14)
 868 #define CONTEXT_USED           (1u<<15)
 869 #define CONTEXT_OLD            (1u<<16)
 870 #define CONTEXT_V6             (1u<<17)
 871 #define CONTEXT_RA_OFF_LINK    (1u<<18)
 872
 873 struct ping_result {
 874   struct in_addr addr;
 875   time_t time;
 876   unsigned int hash;
 877   struct ping_result *next;
 878 };
 879
 880 struct tftp_file {
 881   int refcount, fd;
 882   off_t size;
 883   dev_t dev;
 884   ino_t inode;
 885   char filename[];
 886 };
 887
 888 struct tftp_transfer {
 889   int sockfd;
 890   time_t timeout;
 891   int backoff;
 892   unsigned int block, blocksize, expansion;
 893   off_t offset;
 894   union mysockaddr peer;
 895   char opt_blocksize, opt_transize, netascii, carrylf;
 896   struct tftp_file *file;
 897   struct tftp_transfer *next;
 898 };
 899
 900 struct addr_list {
 901   struct in_addr addr;
 902   struct addr_list *next;
 903 };
 904
 905 struct tftp_prefix {
 906   char *interface;
 907   char *prefix;
 908   int missing;
 909   struct tftp_prefix *next;
 910 };
 911
 912 struct dhcp_relay {
 913   struct all_addr local, server;
 914   char *interface; /* Allowable interface for replies from server, and dest for IPv6 multicast */
 915   int iface_index; /* working - interface in which requests arrived, for return */
 916   struct dhcp_relay *current, *next;
 917 };
 918
 919 extern struct daemon {
 920   /* datastuctures representing the command-line and
 921      config file arguments. All set (including defaults)
 922      in option.c */
 923
 924   unsigned int options, options2;
 925   struct resolvc default_resolv, *resolv_files;
 926   time_t last_resolv;
 927   char *servers_file;
 928   struct mx_srv_record *mxnames;
 929   struct naptr *naptr;
 930   struct txt_record *txt, *rr;
 931   struct ptr_record *ptr;
 932   struct host_record *host_records, *host_records_tail;
 933   struct cname *cnames;
 934   struct auth_zone *auth_zones;
 935   struct interface_name *int_names;
 936   char *mxtarget;
 937   int addr4_netmask;
 938   int addr6_netmask;
 939   char *lease_file;
 940   char *username, *groupname, *scriptuser;
 941   char *luascript;
 942   char *authserver, *hostmaster;
 943   struct iname *authinterface;
 944   struct name_list *secondary_forward_server;
 945   int group_set, osport;
 946   char *domain_suffix;
 947   struct cond_domain *cond_domain, *synth_domains;
 948   char *runfile;
 949   char *lease_change_command;
 950   struct iname *if_names, *if_addrs, *if_except, *dhcp_except, *auth_peers, *tftp_interfaces;
 951   struct bogus_addr *bogus_addr, *ignore_addr;
 952   struct server *servers;
 953   struct ipsets *ipsets;
 954   int log_fac; /* log facility */
 955   char *log_file; /* optional log file */
 956   int max_logs;  /* queue limit */
 957   int cachesize, ftabsize;
 958   int port, query_port, min_port;
 959   unsigned long local_ttl, neg_ttl, max_ttl, min_cache_ttl, max_cache_ttl, auth_ttl;
 960   struct hostsfile *addn_hosts;
 961   struct dhcp_context *dhcp, *dhcp6;
 962   struct ra_interface *ra_interfaces;
 963   struct dhcp_config *dhcp_conf;
 964   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
 965   struct dhcp_vendor *dhcp_vendors;
 966   struct dhcp_mac *dhcp_macs;
 967   struct dhcp_boot *boot_config;
 968   struct pxe_service *pxe_services;
 969   struct tag_if *tag_if;
 970   struct addr_list *override_relays;
 971   struct dhcp_relay *relay4, *relay6;
 972   int override;
 973   int enable_pxe;
 974   int doing_ra, doing_dhcp6;
 975   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 976   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 977   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file, *dynamic_dirs;
 978   int dhcp_max, tftp_max;
 979   int dhcp_server_port, dhcp_client_port;
 980   int start_tftp_port, end_tftp_port;
 981   unsigned int min_leasetime;
 982   struct doctor *doctors;
 983   unsigned short edns_pktsz;
 984   char *tftp_prefix;
 985   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 986   unsigned int duid_enterprise, duid_config_len;
 987   unsigned char *duid_config;
 988   char *dbus_name;
 989   unsigned long soa_sn, soa_refresh, soa_retry, soa_expiry;
 990 #ifdef OPTION6_PREFIX_CLASS
 991   struct prefix_class *prefix_classes;
 992 #endif
 993 #ifdef HAVE_DNSSEC
 994   struct ds_config *ds;
 995   int back_to_the_future;
 996   char *timestamp_file;
 997 #endif
 998
 999   /* globally used stuff for DNS */
1000   char *packet; /* packet buffer */
1001   int packet_buff_sz; /* size of above */
1002   char *namebuff; /* MAXDNAME size buffer */
1003 #ifdef HAVE_DNSSEC
1004   char *keyname; /* MAXDNAME size buffer */
1005   char *workspacename; /* ditto */
1006 #endif
1007   unsigned int local_answer, queries_forwarded, auth_answer;
1008   struct frec *frec_list;
1009   struct serverfd *sfds;
1010   struct irec *interfaces;
1011   struct listener *listeners;
1012   struct server *last_server;
1013   time_t forwardtime;
1014   int forwardcount;
1015   struct server *srv_save; /* Used for resend on DoD */
1016   size_t packet_len;       /*      "        "        */
1017   struct randfd *rfd_save; /*      "        "        */
1018   pid_t tcp_pids[MAX_PROCS];
1019   struct randfd randomsocks[RANDOM_SOCKS];
1020   int v6pktinfo;
1021   struct addrlist *interface_addrs; /* list of all addresses/prefix lengths associated with all local interfaces */
1022   int log_id, log_display_id; /* ids of transactions for logging */
1023   union mysockaddr *log_source_addr;
1024
1025   /* DHCP state */
1026   int dhcpfd, helperfd, pxefd;
1027 #ifdef HAVE_INOTIFY
1028   int inotifyfd;
1029 #endif
1030 #if defined(HAVE_LINUX_NETWORK)
1031   int netlinkfd;
1032 #elif defined(HAVE_BSD_NETWORK)
1033   int dhcp_raw_fd, dhcp_icmp_fd, routefd;
1034 #endif
1035   struct iovec dhcp_packet;
1036   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
1037   struct ping_result *ping_results;
1038   FILE *lease_stream;
1039   struct dhcp_bridge *bridges;
1040 #ifdef HAVE_DHCP6
1041   int duid_len;
1042   unsigned char *duid;
1043   struct iovec outpacket;
1044   int dhcp6fd, icmp6fd;
1045 #endif
1046   /* DBus stuff */
1047   /* void * here to avoid depending on dbus headers outside dbus.c */
1048   void *dbus;
1049 #ifdef HAVE_DBUS
1050   struct watch *watches;
1051 #endif
1052
1053   /* TFTP stuff */
1054   struct tftp_transfer *tftp_trans, *tftp_done_trans;
1055
1056   /* utility string buffer, hold max sized IP address as string */
1057   char *addrbuff;
1058   char *addrbuff2; /* only allocated when OPT_EXTRALOG */
1059
1060 } *daemon;
1061
1062 /* cache.c */
1063 void cache_init(void);
1064 void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
1065 char *record_source(unsigned int index);
1066 char *querystr(char *desc, unsigned short type);
1067 struct crec *cache_find_by_addr(struct crec *crecp,
1068                                 struct all_addr *addr, time_t now,
1069                                 unsigned int prot);
1070 struct crec *cache_find_by_name(struct crec *crecp,
1071                                 char *name, time_t now, unsigned int prot);
1072 void cache_end_insert(void);
1073 void cache_start_insert(void);
1074 struct crec *cache_insert(char *name, struct all_addr *addr,
1075                           time_t now, unsigned long ttl, unsigned short flags);
1076 void cache_reload(void);
1077 void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
1078 struct in_addr a_record_from_hosts(char *name, time_t now);
1079 void cache_unhash_dhcp(void);
1080 void dump_cache(time_t now);
1081 int cache_make_stat(struct txt_record *t);
1082 char *cache_get_name(struct crec *crecp);
1083 char *cache_get_cname_target(struct crec *crecp);
1084 struct crec *cache_enumerate(int init);
1085 int read_hostsfile(char *filename, unsigned int index, int cache_size,
1086                    struct crec **rhash, int hashsz);
1087
1088 /* blockdata.c */
1089 #ifdef HAVE_DNSSEC
1090 void blockdata_init(void);
1091 void blockdata_report(void);
1092 struct blockdata *blockdata_alloc(char *data, size_t len);
1093 void *blockdata_retrieve(struct blockdata *block, size_t len, void *data);
1094 void blockdata_free(struct blockdata *blocks);
1095 #endif
1096
1097 /* domain.c */
1098 char *get_domain(struct in_addr addr);
1099 #ifdef HAVE_IPV6
1100 char *get_domain6(struct in6_addr *addr);
1101 #endif
1102 int is_name_synthetic(int flags, char *name, struct all_addr *addr);
1103 int is_rev_synth(int flag, struct all_addr *addr, char *name);
1104
1105 /* rfc1035.c */
1106 int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
1107                  char *name, int isExtract, int extrabytes);
1108 unsigned char *skip_name(unsigned char *ansp, struct dns_header *header, size_t plen, int extrabytes);
1109 unsigned char *skip_questions(struct dns_header *header, size_t plen);
1110 unsigned char *skip_section(unsigned char *ansp, int count, struct dns_header *header, size_t plen);
1111 unsigned int extract_request(struct dns_header *header, size_t qlen,
1112                                char *name, unsigned short *typep);
1113 size_t setup_reply(struct dns_header *header, size_t  qlen,
1114                    struct all_addr *addrp, unsigned int flags,
1115                    unsigned long local_ttl);
1116 int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff,
1117                       time_t now, char **ipsets, int is_sign, int checkrebind,
1118                       int no_cache, int secure, int *doctored);
1119 size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
1120                       struct in_addr local_addr, struct in_addr local_netmask,
1121                       time_t now, int *ad_reqd, int *do_bit);
1122 int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
1123                              struct bogus_addr *addr, time_t now);
1124 int check_for_ignored_address(struct dns_header *header, size_t qlen, struct bogus_addr *baddr);
1125 unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
1126                                  size_t *len, unsigned char **p, int *is_sign);
1127 int check_for_local_domain(char *name, time_t now);
1128 unsigned int questions_crc(struct dns_header *header, size_t plen, char *buff);
1129 size_t resize_packet(struct dns_header *header, size_t plen,
1130                   unsigned char *pheader, size_t hlen);
1131 size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
1132 size_t add_source_addr(struct dns_header *header, size_t plen, char *limit, union mysockaddr *source);
1133 #ifdef HAVE_DNSSEC
1134 size_t add_do_bit(struct dns_header *header, size_t plen, char *limit);
1135 #endif
1136 int check_source(struct dns_header *header, size_t plen, unsigned char *pseudoheader, union mysockaddr *peer);
1137 int add_resource_record(struct dns_header *header, char *limit, int *truncp,
1138                         int nameoffset, unsigned char **pp, unsigned long ttl,
1139                         int *offset, unsigned short type, unsigned short class, char *format, ...);
1140 unsigned char *skip_questions(struct dns_header *header, size_t plen);
1141 int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
1142                  char *name, int isExtract, int extrabytes);
1143 int in_arpa_name_2_addr(char *namein, struct all_addr *addrp);
1144 int private_net(struct in_addr addr, int ban_localhost);
1145
1146 /* auth.c */
1147 #ifdef HAVE_AUTH
1148 size_t answer_auth(struct dns_header *header, char *limit, size_t qlen,
1149                    time_t now, union mysockaddr *peer_addr, int local_query);
1150 int in_zone(struct auth_zone *zone, char *name, char **cut);
1151 #endif
1152
1153 /* dnssec.c */
1154 size_t dnssec_generate_query(struct dns_header *header, char *end, char *name, int class, int type, union mysockaddr *addr, int edns_pktsz);
1155 int dnssec_validate_by_ds(time_t now, struct dns_header *header, size_t n, char *name, char *keyname, int class);
1156 int dnssec_validate_ds(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname, int class);
1157 int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname, int *class, int *neganswer, int *nons);
1158 int dnssec_chase_cname(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname);
1159 int dnskey_keytag(int alg, int flags, unsigned char *rdata, int rdlen);
1160 size_t filter_rrsigs(struct dns_header *header, size_t plen);
1161 unsigned char* hash_questions(struct dns_header *header, size_t plen, char *name);
1162 int setup_timestamp(void);
1163
1164 /* util.c */
1165 void rand_init(void);
1166 unsigned short rand16(void);
1167 u32 rand32(void);
1168 u64 rand64(void);
1169 int legal_hostname(char *c);
1170 char *canonicalise(char *s, int *nomem);
1171 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
1172 void *safe_malloc(size_t size);
1173 void safe_pipe(int *fd, int read_noblock);
1174 void *whine_malloc(size_t size);
1175 int sa_len(union mysockaddr *addr);
1176 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
1177 int hostname_isequal(const char *a, const char *b);
1178 time_t dnsmasq_time(void);
1179 int netmask_length(struct in_addr mask);
1180 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
1181 #ifdef HAVE_IPV6
1182 int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
1183 u64 addr6part(struct in6_addr *addr);
1184 void setaddr6part(struct in6_addr *addr, u64 host);
1185 #endif
1186 int retry_send(ssize_t rc);
1187 void prettyprint_time(char *buf, unsigned int t);
1188 int prettyprint_addr(union mysockaddr *addr, char *buf);
1189 int parse_hex(char *in, unsigned char *out, int maxlen,
1190               unsigned int *wildcard_mask, int *mac_type);
1191 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
1192                   unsigned int mask);
1193 int expand_buf(struct iovec *iov, size_t size);
1194 char *print_mac(char *buff, unsigned char *mac, int len);
1195 int read_write(int fd, unsigned char *packet, int size, int rw);
1196
1197 int wildcard_match(const char* wildcard, const char* match);
1198 int wildcard_matchn(const char* wildcard, const char* match, int num);
1199
1200 /* log.c */
1201 void die(char *message, char *arg1, int exit_code);
1202 int log_start(struct passwd *ent_pw, int errfd);
1203 int log_reopen(char *log_file);
1204 void my_syslog(int priority, const char *format, ...);
1205 void set_log_writer(void);
1206 void check_log_writer(int force);
1207 void flush_log(void);
1208
1209 /* option.c */
1210 void read_opts (int argc, char **argv, char *compile_opts);
1211 char *option_string(int prot, unsigned int opt, unsigned char *val,
1212                     int opt_len, char *buf, int buf_len);
1213 void reread_dhcp(void);
1214 void read_servers_file(void);
1215 void set_option_bool(unsigned int opt);
1216 void reset_option_bool(unsigned int opt);
1217 struct hostsfile *expand_filelist(struct hostsfile *list);
1218 char *parse_server(char *arg, union mysockaddr *addr,
1219                    union mysockaddr *source_addr, char *interface, int *flags);
1220 int option_read_dynfile(char *file, int flags);
1221
1222 /* forward.c */
1223 void reply_query(int fd, int family, time_t now);
1224 void receive_query(struct listener *listen, time_t now);
1225 unsigned char *tcp_request(int confd, time_t now,
1226                            union mysockaddr *local_addr, struct in_addr netmask, int auth_dns);
1227 void server_gone(struct server *server);
1228 struct frec *get_new_frec(time_t now, int *wait, int force);
1229 int send_from(int fd, int nowild, char *packet, size_t len,
1230                union mysockaddr *to, struct all_addr *source,
1231                unsigned int iface);
1232 void resend_query();
1233 struct randfd *allocate_rfd(int family);
1234 void free_rfd(struct randfd *rfd);
1235
1236 /* network.c */
1237 int indextoname(int fd, int index, char *name);
1238 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
1239 int random_sock(int family);
1240 void pre_allocate_sfds(void);
1241 int reload_servers(char *fname);
1242 void mark_servers(int flag);
1243 void cleanup_servers(void);
1244 void add_update_server(int flags,
1245                        union mysockaddr *addr,
1246                        union mysockaddr *source_addr,
1247                        const char *interface,
1248                        const char *domain);
1249 void check_servers(void);
1250 int enumerate_interfaces(int reset);
1251 void create_wildcard_listeners(void);
1252 void create_bound_listeners(int die);
1253 void warn_bound_listeners(void);
1254 void warn_int_names(void);
1255 int is_dad_listeners(void);
1256 int iface_check(int family, struct all_addr *addr, char *name, int *auth_dns);
1257 int loopback_exception(int fd, int family, struct all_addr *addr, char *name);
1258 int label_exception(int index, int family, struct all_addr *addr);
1259 int fix_fd(int fd);
1260 int tcp_interface(int fd, int af);
1261 #ifdef HAVE_IPV6
1262 int set_ipv6pktinfo(int fd);
1263 #endif
1264 #ifdef HAVE_DHCP6
1265 void join_multicast(int dienow);
1266 #endif
1267 #if defined(HAVE_LINUX_NETWORK) || defined(HAVE_BSD_NETWORK)
1268 void newaddress(time_t now);
1269 #endif
1270
1271
1272 /* dhcp.c */
1273 #ifdef HAVE_DHCP
1274 void dhcp_init(void);
1275 void dhcp_packet(time_t now, int pxe_fd);
1276 struct dhcp_context *address_available(struct dhcp_context *context,
1277                                        struct in_addr addr,
1278                                        struct dhcp_netid *netids);
1279 struct dhcp_context *narrow_context(struct dhcp_context *context,
1280                                     struct in_addr taddr,
1281                                     struct dhcp_netid *netids);
1282 int address_allocate(struct dhcp_context *context,
1283                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
1284                      struct dhcp_netid *netids, time_t now);
1285 void dhcp_read_ethers(void);
1286 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
1287 char *host_from_dns(struct in_addr addr);
1288 #endif
1289
1290 /* lease.c */
1291 #ifdef HAVE_DHCP
1292 void lease_update_file(time_t now);
1293 void lease_update_dns(int force);
1294 void lease_init(time_t now);
1295 struct dhcp_lease *lease4_allocate(struct in_addr addr);
1296 #ifdef HAVE_DHCP6
1297 struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
1298 struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
1299                                int lease_type, int iaid, struct in6_addr *addr);
1300 void lease6_reset(void);
1301 struct dhcp_lease *lease6_find_by_client(struct dhcp_lease *first, int lease_type, unsigned char *clid, int clid_len, int iaid);
1302 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
1303 u64 lease_find_max_addr6(struct dhcp_context *context);
1304 void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
1305 void lease_update_slaac(time_t now);
1306 void lease_set_iaid(struct dhcp_lease *lease, int iaid);
1307 void lease_make_duid(time_t now);
1308 #endif
1309 void lease_set_hwaddr(struct dhcp_lease *lease, const unsigned char *hwaddr,
1310                       const unsigned char *clid, int hw_len, int hw_type,
1311                       int clid_len, time_t now, int force);
1312 void lease_set_hostname(struct dhcp_lease *lease, const char *name, int auth, char *domain, char *config_domain);
1313 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
1314 void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now);
1315 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
1316                                         unsigned char *clid, int clid_len);
1317 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
1318 struct in_addr lease_find_max_addr(struct dhcp_context *context);
1319 void lease_prune(struct dhcp_lease *target, time_t now);
1320 void lease_update_from_configs(void);
1321 int do_script_run(time_t now);
1322 void rerun_scripts(void);
1323 void lease_find_interfaces(time_t now);
1324 #ifdef HAVE_SCRIPT
1325 void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
1326                          unsigned int len, int delim);
1327 #endif
1328 #endif
1329
1330 /* rfc2131.c */
1331 #ifdef HAVE_DHCP
1332 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
1333                   size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd, struct in_addr fallback);
1334 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
1335                                int clid_len, unsigned char *clid, int *len_out);
1336 #endif
1337
1338 /* dnsmasq.c */
1339 #ifdef HAVE_DHCP
1340 int make_icmp_sock(void);
1341 int icmp_ping(struct in_addr addr);
1342 #endif
1343 void queue_event(int event);
1344 void send_alarm(time_t event, time_t now);
1345 void send_event(int fd, int event, int data, char *msg);
1346 void clear_cache_and_reload(time_t now);
1347
1348 /* netlink.c */
1349 #ifdef HAVE_LINUX_NETWORK
1350 void netlink_init(void);
1351 void netlink_multicast(void);
1352 #endif
1353
1354 /* bpf.c */
1355 #ifdef HAVE_BSD_NETWORK
1356 void init_bpf(void);
1357 void send_via_bpf(struct dhcp_packet *mess, size_t len,
1358                   struct in_addr iface_addr, struct ifreq *ifr);
1359 void route_init(void);
1360 void route_sock(void);
1361 #endif
1362
1363 /* bpf.c or netlink.c */
1364 int iface_enumerate(int family, void *parm, int (callback)());
1365
1366 /* dbus.c */
1367 #ifdef HAVE_DBUS
1368 char *dbus_init(void);
1369 void check_dbus_listeners(void);
1370 void set_dbus_listeners(void);
1371 #  ifdef HAVE_DHCP
1372 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
1373 #  endif
1374 #endif
1375
1376 /* ipset.c */
1377 #ifdef HAVE_IPSET
1378 void ipset_init(void);
1379 int add_to_ipset(const char *setname, const struct all_addr *ipaddr, int flags, int remove);
1380 #endif
1381
1382 /* helper.c */
1383 #if defined(HAVE_SCRIPT)
1384 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
1385 void helper_write(void);
1386 void queue_script(int action, struct dhcp_lease *lease,
1387                   char *hostname, time_t now);
1388 #ifdef HAVE_TFTP
1389 void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer);
1390 #endif
1391 int helper_buf_empty(void);
1392 #endif
1393
1394 /* tftp.c */
1395 #ifdef HAVE_TFTP
1396 void tftp_request(struct listener *listen, time_t now);
1397 void check_tftp_listeners(time_t now);
1398 int do_tftp_script_run(void);
1399 #endif
1400
1401 /* conntrack.c */
1402 #ifdef HAVE_CONNTRACK
1403 int get_incoming_mark(union mysockaddr *peer_addr, struct all_addr *local_addr,
1404                       int istcp, unsigned int *markp);
1405 #endif
1406
1407 /* dhcp6.c */
1408 #ifdef HAVE_DHCP6
1409 void dhcp6_init(void);
1410 void dhcp6_packet(time_t now);
1411 struct dhcp_context *address6_allocate(struct dhcp_context *context,  unsigned char *clid, int clid_len, int temp_addr,
1412                                        int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans);
1413 int config_valid(struct dhcp_config *config, struct dhcp_context *context, struct in6_addr *addr);
1414 struct dhcp_context *address6_available(struct dhcp_context *context,
1415                                         struct in6_addr *taddr,
1416                                         struct dhcp_netid *netids,
1417                                         int plain_range);
1418 struct dhcp_context *address6_valid(struct dhcp_context *context,
1419                                     struct in6_addr *taddr,
1420                                     struct dhcp_netid *netids,
1421                                     int plain_range);
1422 struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1423                                             int prefix, u64 addr);
1424 void make_duid(time_t now);
1425 void dhcp_construct_contexts(time_t now);
1426 void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac,
1427                     unsigned int *maclenp, unsigned int *mactypep);
1428 #endif
1429
1430 /* rfc3315.c */
1431 #ifdef HAVE_DHCP6
1432 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1433                            struct in6_addr *fallback, struct in6_addr *ll_addr, struct in6_addr *ula_addr,
1434                            size_t sz, struct in6_addr *client_addr, time_t now);
1435 void relay_upstream6(struct dhcp_relay *relay, ssize_t sz, struct in6_addr *peer_address, u32 scope_id);
1436
1437 unsigned short relay_reply6( struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface);
1438 #endif
1439
1440 /* dhcp-common.c */
1441 #ifdef HAVE_DHCP
1442 void dhcp_common_init(void);
1443 ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1444 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
1445 struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1446                                  struct dhcp_opt *opts);
1447 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
1448 char *strip_hostname(char *hostname);
1449 void log_tags(struct dhcp_netid *netid, u32 xid);
1450 int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1451 void dhcp_update_configs(struct dhcp_config *configs);
1452 void display_opts(void);
1453 int lookup_dhcp_opt(int prot, char *name);
1454 int lookup_dhcp_len(int prot, int val);
1455 char *option_string(int prot, unsigned int opt, unsigned char *val,
1456                     int opt_len, char *buf, int buf_len);
1457 struct dhcp_config *find_config(struct dhcp_config *configs,
1458                                 struct dhcp_context *context,
1459                                 unsigned char *clid, int clid_len,
1460                                 unsigned char *hwaddr, int hw_len,
1461                                 int hw_type, char *hostname);
1462 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
1463 #ifdef HAVE_LINUX_NETWORK
1464 char *whichdevice(void);
1465 void bindtodevice(char *device, int fd);
1466 #endif
1467 #  ifdef HAVE_DHCP6
1468 void display_opts6(void);
1469 #  endif
1470 void log_context(int family, struct dhcp_context *context);
1471 void log_relay(int family, struct dhcp_relay *relay);
1472 #endif
1473
1474 /* outpacket.c */
1475 #ifdef HAVE_DHCP6
1476 void end_opt6(int container);
1477 int save_counter(int newval);
1478 void *expand(size_t headroom);
1479 int new_opt6(int opt);
1480 void *put_opt6(void *data, size_t len);
1481 void put_opt6_long(unsigned int val);
1482 void put_opt6_short(unsigned int val);
1483 void put_opt6_char(unsigned int val);
1484 void put_opt6_string(char *s);
1485 #endif
1486
1487 /* radv.c */
1488 #ifdef HAVE_DHCP6
1489 void ra_init(time_t now);
1490 void icmp6_packet(time_t now);
1491 time_t periodic_ra(time_t now);
1492 void ra_start_unsolicted(time_t now, struct dhcp_context *context);
1493 #endif
1494
1495 /* slaac.c */
1496 #ifdef HAVE_DHCP6
1497 void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force);
1498 time_t periodic_slaac(time_t now, struct dhcp_lease *leases);
1499 void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases);
1500 #endif
1501
1502 /* loop.c */
1503 #ifdef HAVE_LOOP
1504 void loop_send_probes();
1505 int detect_loop(char *query, int type);
1506 #endif
1507
1508 /* inotify.c */
1509 #ifdef HAVE_INOTIFY
1510 void inotify_dnsmasq_init();
1511 int inotify_check(time_t now);
1512 void set_dynamic_inotify(int flag, int total_size, struct crec **rhash, int revhashsz);
1513 #endif
1514
1515 /* poll.c */
1516 void poll_reset(void);
1517 int poll_check(int fd, short event);
1518 void poll_listen(int fd, short event);
1519 int do_poll(int timeout);
1520