src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2013 Simon Kelley
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; version 2 dated June, 1991, or
   6    (at your option) version 3 dated 29 June, 2007.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16
  17 #define COPYRIGHT "Copyright (c) 2000-2013 Simon Kelley"
  18
  19 #ifndef NO_LARGEFILE
  20 /* Ensure we can use files >2GB (log files may grow this big) */
  21 #  define _LARGEFILE_SOURCE 1
  22 #  define _FILE_OFFSET_BITS 64
  23 #endif
  24
  25 /* Get linux C library versions and define _GNU_SOURCE for kFreeBSD. */
  26 #if defined(__linux__) || defined(__GLIBC__)
  27 #  ifndef __ANDROID__
  28 #      define _GNU_SOURCE
  29 #  endif
  30 #  include <features.h>
  31 #endif
  32
  33 /* Need these defined early */
  34 #if defined(__sun) || defined(__sun__)
  35 #  define _XPG4_2
  36 #  define __EXTENSIONS__
  37 #endif
  38
  39 /* get these before config.h  for IPv6 stuff... */
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42
  43 #ifdef __APPLE__
  44 /* Define before netinet/in.h to select API. OSX Lion onwards. */
  45 #  define __APPLE_USE_RFC_3542
  46 #endif
  47 #include <netinet/in.h>
  48
  49 /* Also needed before config.h. */
  50 #include <getopt.h>
  51
  52 #include "config.h"
  53
  54 typedef unsigned char u8;
  55 typedef unsigned short u16;
  56 typedef unsigned int u32;
  57 typedef unsigned long long u64;
  58
  59 #include "dns-protocol.h"
  60 #include "dhcp-protocol.h"
  61 #ifdef HAVE_DHCP6
  62 #include "dhcp6-protocol.h"
  63 #include "radv-protocol.h"
  64 #endif
  65
  66 #define gettext_noop(S) (S)
  67 #ifndef LOCALEDIR
  68 #  define _(S) (S)
  69 #else
  70 #  include <libintl.h>
  71 #  include <locale.h>
  72 #  define _(S) gettext(S)
  73 #endif
  74
  75 #include <arpa/inet.h>
  76 #include <sys/stat.h>
  77 #include <sys/ioctl.h>
  78 #if defined(HAVE_SOLARIS_NETWORK)
  79 #  include <sys/sockio.h>
  80 #endif
  81 #include <sys/select.h>
  82 #include <sys/wait.h>
  83 #include <sys/time.h>
  84 #include <sys/un.h>
  85 #include <limits.h>
  86 #include <net/if.h>
  87 #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu)
  88 /* Some solaris net/if./h omit this. */
  89 #  define ifr_mtu  ifr_ifru.ifru_metric
  90 #endif
  91 #include <unistd.h>
  92 #include <stdio.h>
  93 #include <string.h>
  94 #include <stdlib.h>
  95 #include <fcntl.h>
  96 #include <ctype.h>
  97 #include <signal.h>
  98 #include <stddef.h>
  99 #include <time.h>
 100 #include <errno.h>
 101 #include <pwd.h>
 102 #include <grp.h>
 103 #include <stdarg.h>
 104 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__)
 105 #  include <netinet/if_ether.h>
 106 #else
 107 #  include <net/ethernet.h>
 108 #endif
 109 #include <net/if_arp.h>
 110 #include <netinet/in_systm.h>
 111 #include <netinet/ip.h>
 112 #include <netinet/ip_icmp.h>
 113 #include <sys/uio.h>
 114 #include <syslog.h>
 115 #include <dirent.h>
 116 #ifndef HAVE_LINUX_NETWORK
 117 #  include <net/if_dl.h>
 118 #endif
 119
 120 #if defined(HAVE_LINUX_NETWORK)
 121 #include <linux/capability.h>
 122 /* There doesn't seem to be a universally-available
 123    userpace header for these. */
 124 extern int capset(cap_user_header_t header, cap_user_data_t data);
 125 extern int capget(cap_user_header_t header, cap_user_data_t data);
 126 #define LINUX_CAPABILITY_VERSION_1  0x19980330
 127 #define LINUX_CAPABILITY_VERSION_2  0x20071026
 128 #define LINUX_CAPABILITY_VERSION_3  0x20080522
 129
 130 #include <sys/prctl.h>
 131 #elif defined(HAVE_SOLARIS_NETWORK)
 132 #include <priv.h>
 133 #endif
 134
 135 /* daemon is function in the C library.... */
 136 #define daemon dnsmasq_daemon
 137
 138 /* Async event queue */
 139 struct event_desc {
 140   int event, data, msg_sz;
 141 };
 142
 143 #define EVENT_RELOAD    1
 144 #define EVENT_DUMP      2
 145 #define EVENT_ALARM     3
 146 #define EVENT_TERM      4
 147 #define EVENT_CHILD     5
 148 #define EVENT_REOPEN    6
 149 #define EVENT_EXITED    7
 150 #define EVENT_KILLED    8
 151 #define EVENT_EXEC_ERR  9
 152 #define EVENT_PIPE_ERR  10
 153 #define EVENT_USER_ERR  11
 154 #define EVENT_CAP_ERR   12
 155 #define EVENT_PIDFILE   13
 156 #define EVENT_HUSER_ERR 14
 157 #define EVENT_GROUP_ERR 15
 158 #define EVENT_DIE       16
 159 #define EVENT_LOG_ERR   17
 160 #define EVENT_FORK_ERR  18
 161 #define EVENT_LUA_ERR   19
 162 #define EVENT_TFTP_ERR  20
 163
 164 /* Exit codes. */
 165 #define EC_GOOD        0
 166 #define EC_BADCONF     1
 167 #define EC_BADNET      2
 168 #define EC_FILE        3
 169 #define EC_NOMEM       4
 170 #define EC_MISC        5
 171 #define EC_INIT_OFFSET 10
 172
 173 /* Min buffer size: we check after adding each record, so there must be
 174    memory for the largest packet, and the largest record so the
 175    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 176    This might be increased is EDNS packet size if greater than the minimum.
 177 */
 178 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 179
 180 /* Trust the compiler dead-code eliminator.... */
 181 #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
 182
 183 #define OPT_BOGUSPRIV      0
 184 #define OPT_FILTER         1
 185 #define OPT_LOG            2
 186 #define OPT_SELFMX         3
 187 #define OPT_NO_HOSTS       4
 188 #define OPT_NO_POLL        5
 189 #define OPT_DEBUG          6
 190 #define OPT_ORDER          7
 191 #define OPT_NO_RESOLV      8
 192 #define OPT_EXPAND         9
 193 #define OPT_LOCALMX        10
 194 #define OPT_NO_NEG         11
 195 #define OPT_NODOTS_LOCAL   12
 196 #define OPT_NOWILD         13
 197 #define OPT_ETHERS         14
 198 #define OPT_RESOLV_DOMAIN  15
 199 #define OPT_NO_FORK        16
 200 #define OPT_AUTHORITATIVE  17
 201 #define OPT_LOCALISE       18
 202 #define OPT_DBUS           19
 203 #define OPT_DHCP_FQDN      20
 204 #define OPT_NO_PING        21
 205 #define OPT_LEASE_RO       22
 206 #define OPT_ALL_SERVERS    23
 207 #define OPT_RELOAD         24
 208 #define OPT_LOCAL_REBIND   25
 209 #define OPT_TFTP_SECURE    26
 210 #define OPT_TFTP_NOBLOCK   27
 211 #define OPT_LOG_OPTS       28
 212 #define OPT_TFTP_APREF     29
 213 #define OPT_NO_OVERRIDE    30
 214 #define OPT_NO_REBIND      31
 215 #define OPT_ADD_MAC        32
 216 #define OPT_DNSSEC         33
 217 #define OPT_CONSEC_ADDR    34
 218 #define OPT_CONNTRACK      35
 219 #define OPT_FQDN_UPDATE    36
 220 #define OPT_RA             37
 221 #define OPT_TFTP_LC        38
 222 #define OPT_CLEVERBIND     39
 223 #define OPT_TFTP           40
 224 #define OPT_FAST_RA        41
 225 #define OPT_LAST           42
 226
 227 /* extra flags for my_syslog, we use a couple of facilities since they are known
 228    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 229 #define MS_TFTP LOG_USER
 230 #define MS_DHCP LOG_DAEMON
 231
 232 struct all_addr {
 233   union {
 234     struct in_addr addr4;
 235 #ifdef HAVE_IPV6
 236     struct in6_addr addr6;
 237 #endif
 238   } addr;
 239 };
 240
 241 struct bogus_addr {
 242   struct in_addr addr;
 243   struct bogus_addr *next;
 244 };
 245
 246 /* dns doctor param */
 247 struct doctor {
 248   struct in_addr in, end, out, mask;
 249   struct doctor *next;
 250 };
 251
 252 struct mx_srv_record {
 253   char *name, *target;
 254   int issrv, srvport, priority, weight;
 255   unsigned int offset;
 256   struct mx_srv_record *next;
 257 };
 258
 259 struct naptr {
 260   char *name, *replace, *regexp, *services, *flags;
 261   unsigned int order, pref;
 262   struct naptr *next;
 263 };
 264
 265 struct txt_record {
 266   char *name;
 267   unsigned char *txt;
 268   unsigned short class, len;
 269   struct txt_record *next;
 270 };
 271
 272 struct ptr_record {
 273   char *name, *ptr;
 274   struct ptr_record *next;
 275 };
 276
 277 struct cname {
 278   char *alias, *target;
 279   struct cname *next;
 280 };
 281
 282 struct auth_zone {
 283   char *domain;
 284   struct subnet {
 285     int is6, prefixlen;
 286     struct in_addr addr4;
 287 #ifdef HAVE_IPV6
 288     struct in6_addr addr6;
 289 #endif
 290     struct subnet *next;
 291   } *subnet;
 292   struct auth_zone *next;
 293 };
 294
 295
 296 struct host_record {
 297   struct name_list {
 298     char *name;
 299     struct name_list *next;
 300   } *names;
 301   struct in_addr addr;
 302 #ifdef HAVE_IPV6
 303   struct in6_addr addr6;
 304 #endif
 305   struct host_record *next;
 306 };
 307
 308 struct interface_name {
 309   char *name; /* domain name */
 310   char *intr; /* interface name */
 311   struct addrlist {
 312     struct all_addr addr;
 313     struct addrlist *next;
 314   } *addr4;
 315 #ifdef HAVE_IPV6
 316   struct addrlist *addr6;
 317 #endif
 318   struct interface_name *next;
 319 };
 320
 321 union bigname {
 322   char name[MAXDNAME];
 323   union bigname *next; /* freelist */
 324 };
 325
 326 struct keydata {
 327   struct keydata *next;
 328   unsigned char key[KEYBLOCK_LEN];
 329 };
 330
 331 struct crec {
 332   struct crec *next, *prev, *hash_next;
 333   /* union is 16 bytes when doing IPv6, 8 bytes on 32 bit machines without IPv6 */
 334   union {
 335     struct all_addr addr;
 336     struct {
 337       struct crec *cache;
 338       int uid;
 339     } cname;
 340     struct {
 341       struct keydata *keydata;
 342       unsigned char algo;
 343       unsigned char digest; /* DS only */
 344       unsigned short flags_or_keyid; /* flags for DNSKEY, keyid for DS */
 345     } key;
 346   } addr;
 347   time_t ttd; /* time to die */
 348   /* used as keylen if F_DS or F_DNSKEY, index to source for F_HOSTS */
 349   int uid;
 350   unsigned short flags;
 351   union {
 352     char sname[SMALLDNAME];
 353     union bigname *bname;
 354     char *namep;
 355   } name;
 356 };
 357
 358 #define F_IMMORTAL  (1u<<0)
 359 #define F_NAMEP     (1u<<1)
 360 #define F_REVERSE   (1u<<2)
 361 #define F_FORWARD   (1u<<3)
 362 #define F_DHCP      (1u<<4)
 363 #define F_NEG       (1u<<5)
 364 #define F_HOSTS     (1u<<6)
 365 #define F_IPV4      (1u<<7)
 366 #define F_IPV6      (1u<<8)
 367 #define F_BIGNAME   (1u<<9)
 368 #define F_NXDOMAIN  (1u<<10)
 369 #define F_CNAME     (1u<<11)
 370 #define F_DNSKEY    (1u<<12)
 371 #define F_CONFIG    (1u<<13)
 372 #define F_DS        (1u<<14)
 373 #define F_DNSSECOK  (1u<<15)
 374
 375 /* below here are only valid as args to log_query: cache
 376    entries are limited to 16 bits */
 377 #define F_UPSTREAM  (1u<<16)
 378 #define F_RRNAME    (1u<<17)
 379 #define F_SERVER    (1u<<18)
 380 #define F_QUERY     (1u<<19)
 381 #define F_NOERR     (1u<<20)
 382 #define F_AUTH      (1u<<21)
 383
 384 /* composites */
 385 #define F_TYPE      (F_IPV4 | F_IPV6 | F_DNSKEY | F_DS) /* Only one may be set */
 386
 387
 388
 389 /* struct sockaddr is not large enough to hold any address,
 390    and specifically not big enough to hold an IPv6 address.
 391    Blech. Roll our own. */
 392 union mysockaddr {
 393   struct sockaddr sa;
 394   struct sockaddr_in in;
 395 #if defined(HAVE_IPV6)
 396   struct sockaddr_in6 in6;
 397 #endif
 398 };
 399
 400 /* bits in flag param to IPv6 callbacks from iface_enumerate() */
 401 #define IFACE_TENTATIVE   1
 402 #define IFACE_DEPRECATED  2
 403 #define IFACE_PERMANENT   4
 404
 405
 406 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 407 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 408 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 409 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 410 #define SERV_HAS_SOURCE       16  /* source address defined */
 411 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 412 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 413 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 414 #define SERV_MARK            256  /* for mark-and-delete */
 415 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 416 #define SERV_COUNTED         512  /* workspace for log code */
 417 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 418 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 419
 420 struct serverfd {
 421   int fd;
 422   union mysockaddr source_addr;
 423   char interface[IF_NAMESIZE+1];
 424   struct serverfd *next;
 425 };
 426
 427 struct randfd {
 428   int fd;
 429   unsigned short refcount, family;
 430 };
 431
 432 struct server {
 433   union mysockaddr addr, source_addr;
 434   char interface[IF_NAMESIZE+1];
 435   struct serverfd *sfd;
 436   char *domain; /* set if this server only handles a domain. */
 437   int flags, tcpfd;
 438   unsigned int queries, failed_queries;
 439   struct server *next;
 440 };
 441
 442 struct ipsets {
 443   char **sets;
 444   char *domain;
 445   struct ipsets *next;
 446 };
 447
 448 struct irec {
 449   union mysockaddr addr;
 450   struct in_addr netmask; /* only valid for IPv4 */
 451   int tftp_ok, dhcp_ok, mtu, done, dad, dns_auth, index, multicast_done;
 452   char *name;
 453   struct irec *next;
 454 };
 455
 456 struct listener {
 457   int fd, tcpfd, tftpfd, family;
 458   struct irec *iface; /* only sometimes valid for non-wildcard */
 459   struct listener *next;
 460 };
 461
 462 /* interface and address parms from command line. */
 463 struct iname {
 464   char *name;
 465   union mysockaddr addr;
 466   int used;
 467   struct iname *next;
 468 };
 469
 470 /* resolv-file parms from command-line */
 471 struct resolvc {
 472   struct resolvc *next;
 473   int is_default, logged;
 474   time_t mtime;
 475   char *name;
 476 };
 477
 478 /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile */
 479 #define AH_DIR      1
 480 #define AH_INACTIVE 2
 481 struct hostsfile {
 482   struct hostsfile *next;
 483   int flags;
 484   char *fname;
 485   int index; /* matches to cache entries for logging */
 486 };
 487
 488 #define FREC_NOREBIND           1
 489 #define FREC_CHECKING_DISABLED  2
 490
 491 struct frec {
 492   union mysockaddr source;
 493   struct all_addr dest;
 494   struct server *sentto; /* NULL means free */
 495   struct randfd *rfd4;
 496 #ifdef HAVE_IPV6
 497   struct randfd *rfd6;
 498 #endif
 499   unsigned int iface;
 500   unsigned short orig_id, new_id;
 501   int fd, forwardall, flags;
 502   unsigned int crc;
 503   time_t time;
 504   struct frec *next;
 505 };
 506
 507 /* flags in top of length field for DHCP-option tables */
 508 #define OT_ADDR_LIST    0x8000
 509 #define OT_RFC1035_NAME 0x4000
 510 #define OT_INTERNAL     0x2000
 511 #define OT_NAME         0x1000
 512 #define OT_CSTRING      0x0800
 513 #define OT_DEC          0x0400
 514 #define OT_TIME         0x0200
 515
 516 /* actions in the daemon->helper RPC */
 517 #define ACTION_DEL           1
 518 #define ACTION_OLD_HOSTNAME  2
 519 #define ACTION_OLD           3
 520 #define ACTION_ADD           4
 521 #define ACTION_TFTP          5
 522
 523 #define LEASE_NEW            1  /* newly created */
 524 #define LEASE_CHANGED        2  /* modified */
 525 #define LEASE_AUX_CHANGED    4  /* CLID or expiry changed */
 526 #define LEASE_AUTH_NAME      8  /* hostname came from config, not from client */
 527 #define LEASE_USED          16  /* used this DHCPv6 transaction */
 528 #define LEASE_NA            32  /* IPv6 no-temporary lease */
 529 #define LEASE_TA            64  /* IPv6 temporary lease */
 530 #define LEASE_HAVE_HWADDR  128  /* Have set hwaddress */
 531
 532 struct dhcp_lease {
 533   int clid_len;          /* length of client identifier */
 534   unsigned char *clid;   /* clientid */
 535   char *hostname, *fqdn; /* name from client-hostname option or config */
 536   char *old_hostname;    /* hostname before it moved to another lease */
 537   int flags;
 538   time_t expires;        /* lease expiry */
 539 #ifdef HAVE_BROKEN_RTC
 540   unsigned int length;
 541 #endif
 542   int hwaddr_len, hwaddr_type; /* hw_type used for iaid in v6 */
 543   unsigned char hwaddr[DHCP_CHADDR_MAX]; /* also IPv6 address */
 544   struct in_addr addr, override, giaddr;
 545   unsigned char *extradata;
 546   unsigned int extradata_len, extradata_size;
 547   int last_interface;
 548 #ifdef HAVE_DHCP6
 549   struct slaac_address {
 550     struct in6_addr addr, local;
 551     time_t ping_time;
 552     int backoff; /* zero -> confirmed */
 553     struct slaac_address *next;
 554   } *slaac_address;
 555   int vendorclass_count;
 556 #endif
 557   struct dhcp_lease *next;
 558 };
 559
 560 struct dhcp_netid {
 561   char *net;
 562   struct dhcp_netid *next;
 563 };
 564
 565 struct dhcp_netid_list {
 566   struct dhcp_netid *list;
 567   struct dhcp_netid_list *next;
 568 };
 569
 570 struct tag_if {
 571   struct dhcp_netid_list *set;
 572   struct dhcp_netid *tag;
 573   struct tag_if *next;
 574 };
 575
 576 struct hwaddr_config {
 577   int hwaddr_len, hwaddr_type;
 578   unsigned char hwaddr[DHCP_CHADDR_MAX];
 579   unsigned int wildcard_mask;
 580   struct hwaddr_config *next;
 581 };
 582
 583 struct dhcp_config {
 584   unsigned int flags;
 585   int clid_len;          /* length of client identifier */
 586   unsigned char *clid;   /* clientid */
 587   char *hostname, *domain;
 588   struct dhcp_netid_list *netid;
 589 #ifdef HAVE_DHCP6
 590   struct in6_addr addr6;
 591 #endif
 592   struct in_addr addr;
 593   time_t decline_time;
 594   unsigned int lease_time;
 595   struct hwaddr_config *hwaddr;
 596   struct dhcp_config *next;
 597 };
 598
 599 #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
 600
 601 #define CONFIG_DISABLE           1
 602 #define CONFIG_CLID              2
 603 #define CONFIG_TIME              8
 604 #define CONFIG_NAME             16
 605 #define CONFIG_ADDR             32
 606 #define CONFIG_NOCLID          128
 607 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 608 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 609 #define CONFIG_DECLINED       1024    /* address declined by client */
 610 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 611 #define CONFIG_ADDR6          4096
 612 #define CONFIG_WILDCARD       8192
 613
 614 struct dhcp_opt {
 615   int opt, len, flags;
 616   union {
 617     int encap;
 618     unsigned int wildcard_mask;
 619     unsigned char *vendor_class;
 620   } u;
 621   unsigned char *val;
 622   struct dhcp_netid *netid;
 623   struct dhcp_opt *next;
 624 };
 625
 626 #define DHOPT_ADDR               1
 627 #define DHOPT_STRING             2
 628 #define DHOPT_ENCAPSULATE        4
 629 #define DHOPT_ENCAP_MATCH        8
 630 #define DHOPT_FORCE             16
 631 #define DHOPT_BANK              32
 632 #define DHOPT_ENCAP_DONE        64
 633 #define DHOPT_MATCH            128
 634 #define DHOPT_VENDOR           256
 635 #define DHOPT_HEX              512
 636 #define DHOPT_VENDOR_MATCH    1024
 637 #define DHOPT_RFC3925         2048
 638 #define DHOPT_TAGOK           4096
 639 #define DHOPT_ADDR6           8192
 640
 641 struct dhcp_boot {
 642   char *file, *sname, *tftp_sname;
 643   struct in_addr next_server;
 644   struct dhcp_netid *netid;
 645   struct dhcp_boot *next;
 646 };
 647
 648 struct pxe_service {
 649   unsigned short CSA, type;
 650   char *menu, *basename, *sname;
 651   struct in_addr server;
 652   struct dhcp_netid *netid;
 653   struct pxe_service *next;
 654 };
 655
 656 #define MATCH_VENDOR     1
 657 #define MATCH_USER       2
 658 #define MATCH_CIRCUIT    3
 659 #define MATCH_REMOTE     4
 660 #define MATCH_SUBSCRIBER 5
 661
 662 /* vendorclass, userclass, remote-id or cicuit-id */
 663 struct dhcp_vendor {
 664   int len, match_type;
 665   unsigned int enterprise;
 666   char *data;
 667   struct dhcp_netid netid;
 668   struct dhcp_vendor *next;
 669 };
 670
 671 struct dhcp_mac {
 672   unsigned int mask;
 673   int hwaddr_len, hwaddr_type;
 674   unsigned char hwaddr[DHCP_CHADDR_MAX];
 675   struct dhcp_netid netid;
 676   struct dhcp_mac *next;
 677 };
 678
 679 struct dhcp_bridge {
 680   char iface[IF_NAMESIZE];
 681   struct dhcp_bridge *alias, *next;
 682 };
 683
 684 struct cond_domain {
 685   char *domain, *prefix;
 686   struct in_addr start, end;
 687 #ifdef HAVE_IPV6
 688   struct in6_addr start6, end6;
 689 #endif
 690   int is6;
 691   struct cond_domain *next;
 692 };
 693
 694 #ifdef OPTION6_PREFIX_CLASS
 695 struct prefix_class {
 696   int class;
 697   struct dhcp_netid tag;
 698   struct prefix_class *next;
 699 };
 700 #endif
 701
 702 struct dhcp_context {
 703   unsigned int lease_time, addr_epoch;
 704   struct in_addr netmask, broadcast;
 705   struct in_addr local, router;
 706   struct in_addr start, end; /* range of available addresses */
 707 #ifdef HAVE_DHCP6
 708   struct in6_addr start6, end6; /* range of available addresses */
 709   struct in6_addr local6;
 710   int prefix, if_index;
 711   unsigned int valid, preferred, saved_valid;
 712   time_t ra_time, ra_short_period_start, address_lost_time;
 713   char *template_interface;
 714 #endif
 715   int flags;
 716   struct dhcp_netid netid, *filter;
 717   struct dhcp_context *next, *current;
 718 };
 719
 720 #define CONTEXT_STATIC         1
 721 #define CONTEXT_NETMASK        2
 722 #define CONTEXT_BRDCAST        4
 723 #define CONTEXT_PROXY          8
 724 #define CONTEXT_RA_ONLY       16
 725 #define CONTEXT_RA_DONE       32
 726 #define CONTEXT_RA_NAME       64
 727 #define CONTEXT_RA_STATELESS 128
 728 #define CONTEXT_DHCP         256
 729 #define CONTEXT_DEPRECATE    512
 730 #define CONTEXT_TEMPLATE    1024    /* create contexts using addresses */
 731 #define CONTEXT_CONSTRUCTED 2048
 732 #define CONTEXT_GC          4096
 733 #define CONTEXT_RA          8192
 734 #define CONTEXT_CONF_USED  16384
 735 #define CONTEXT_USED       32768
 736 #define CONTEXT_NOAUTH     65536
 737 #define CONTEXT_OLD       131072
 738
 739
 740 struct ping_result {
 741   struct in_addr addr;
 742   time_t time;
 743   unsigned int hash;
 744   struct ping_result *next;
 745 };
 746
 747 struct tftp_file {
 748   int refcount, fd;
 749   off_t size;
 750   dev_t dev;
 751   ino_t inode;
 752   char filename[];
 753 };
 754
 755 struct tftp_transfer {
 756   int sockfd;
 757   time_t timeout;
 758   int backoff;
 759   unsigned int block, blocksize, expansion;
 760   off_t offset;
 761   union mysockaddr peer;
 762   char opt_blocksize, opt_transize, netascii, carrylf;
 763   struct tftp_file *file;
 764   struct tftp_transfer *next;
 765 };
 766
 767 struct addr_list {
 768   struct in_addr addr;
 769   struct addr_list *next;
 770 };
 771
 772 struct tftp_prefix {
 773   char *interface;
 774   char *prefix;
 775   struct tftp_prefix *next;
 776 };
 777
 778 struct dhcp_relay {
 779   struct all_addr local, server;
 780   char *interface; /* Allowable interface for replies from server, and dest for IPv6 multicast */
 781   int iface_index; /* working - interface in which requests arrived, for return */
 782   struct dhcp_relay *current, *next;
 783 };
 784
 785 extern struct daemon {
 786   /* datastuctures representing the command-line and
 787      config file arguments. All set (including defaults)
 788      in option.c */
 789
 790   unsigned int options, options2;
 791   struct resolvc default_resolv, *resolv_files;
 792   time_t last_resolv;
 793   struct mx_srv_record *mxnames;
 794   struct naptr *naptr;
 795   struct txt_record *txt, *rr;
 796   struct ptr_record *ptr;
 797   struct host_record *host_records, *host_records_tail;
 798   struct cname *cnames;
 799   struct auth_zone *auth_zones;
 800   struct interface_name *int_names;
 801   char *mxtarget;
 802   char *lease_file;
 803   char *username, *groupname, *scriptuser;
 804   char *luascript;
 805   char *authserver, *hostmaster;
 806   struct iname *authinterface;
 807   struct name_list *secondary_forward_server;
 808   int group_set, osport;
 809   char *domain_suffix;
 810   struct cond_domain *cond_domain, *synth_domains;
 811   char *runfile;
 812   char *lease_change_command;
 813   struct iname *if_names, *if_addrs, *if_except, *dhcp_except, *auth_peers, *tftp_interfaces;
 814   struct bogus_addr *bogus_addr;
 815   struct server *servers;
 816   struct ipsets *ipsets;
 817   int log_fac; /* log facility */
 818   char *log_file; /* optional log file */
 819   int max_logs;  /* queue limit */
 820   int cachesize, ftabsize;
 821   int port, query_port, min_port;
 822   unsigned long local_ttl, neg_ttl, max_ttl, max_cache_ttl, auth_ttl;
 823   struct hostsfile *addn_hosts;
 824   struct dhcp_context *dhcp, *dhcp6;
 825   struct dhcp_config *dhcp_conf;
 826   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
 827   struct dhcp_vendor *dhcp_vendors;
 828   struct dhcp_mac *dhcp_macs;
 829   struct dhcp_boot *boot_config;
 830   struct pxe_service *pxe_services;
 831   struct tag_if *tag_if;
 832   struct addr_list *override_relays;
 833   struct dhcp_relay *relay4, *relay6;
 834   int override;
 835   int enable_pxe;
 836   int doing_ra, doing_dhcp6;
 837   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 838   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 839   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
 840   int dhcp_max, tftp_max;
 841   int dhcp_server_port, dhcp_client_port;
 842   int start_tftp_port, end_tftp_port;
 843   unsigned int min_leasetime;
 844   struct doctor *doctors;
 845   unsigned short edns_pktsz;
 846   char *tftp_prefix;
 847   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 848   unsigned int duid_enterprise, duid_config_len;
 849   unsigned char *duid_config;
 850   char *dbus_name;
 851   unsigned long soa_sn, soa_refresh, soa_retry, soa_expiry;
 852 #ifdef OPTION6_PREFIX_CLASS
 853   struct prefix_class *prefix_classes;
 854 #endif
 855
 856   /* globally used stuff for DNS */
 857   char *packet; /* packet buffer */
 858   int packet_buff_sz; /* size of above */
 859   char *namebuff; /* MAXDNAME size buffer */
 860   unsigned int local_answer, queries_forwarded;
 861   struct frec *frec_list;
 862   struct serverfd *sfds;
 863   struct irec *interfaces;
 864   struct listener *listeners;
 865   struct server *last_server;
 866   time_t forwardtime;
 867   int forwardcount;
 868   struct server *srv_save; /* Used for resend on DoD */
 869   size_t packet_len;       /*      "        "        */
 870   struct randfd *rfd_save; /*      "        "        */
 871   pid_t tcp_pids[MAX_PROCS];
 872   struct randfd randomsocks[RANDOM_SOCKS];
 873   int v6pktinfo;
 874
 875   /* DHCP state */
 876   int dhcpfd, helperfd, pxefd;
 877 #if defined(HAVE_LINUX_NETWORK)
 878   int netlinkfd;
 879 #elif defined(HAVE_BSD_NETWORK)
 880   int dhcp_raw_fd, dhcp_icmp_fd;
 881 #endif
 882   struct iovec dhcp_packet;
 883   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
 884   struct ping_result *ping_results;
 885   FILE *lease_stream;
 886   struct dhcp_bridge *bridges;
 887 #ifdef HAVE_DHCP6
 888   int duid_len;
 889   unsigned char *duid;
 890   struct iovec outpacket;
 891   int dhcp6fd, icmp6fd;
 892 #endif
 893   /* DBus stuff */
 894   /* void * here to avoid depending on dbus headers outside dbus.c */
 895   void *dbus;
 896 #ifdef HAVE_DBUS
 897   struct watch *watches;
 898 #endif
 899
 900   /* TFTP stuff */
 901   struct tftp_transfer *tftp_trans, *tftp_done_trans;
 902
 903   /* utility string buffer, hold max sized IP address as string */
 904   char *addrbuff;
 905
 906 } *daemon;
 907
 908 /* cache.c */
 909 void cache_init(void);
 910 void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
 911 char *record_source(int index);
 912 void querystr(char *desc, char *str, unsigned short type);
 913 struct crec *cache_find_by_addr(struct crec *crecp,
 914                                 struct all_addr *addr, time_t now,
 915                                 unsigned short prot);
 916 struct crec *cache_find_by_name(struct crec *crecp,
 917                                 char *name, time_t now, unsigned short  prot);
 918 void cache_end_insert(void);
 919 void cache_start_insert(void);
 920 struct crec *cache_insert(char *name, struct all_addr *addr,
 921                           time_t now, unsigned long ttl, unsigned short flags);
 922 void cache_reload(void);
 923 void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
 924 struct in_addr a_record_from_hosts(char *name, time_t now);
 925 void cache_unhash_dhcp(void);
 926 void dump_cache(time_t now);
 927 char *cache_get_name(struct crec *crecp);
 928 struct crec *cache_enumerate(int init);
 929 #ifdef HAVE_DNSSEC
 930 struct keydata *keydata_alloc(char *data, size_t len);
 931 void keydata_free(struct keydata *blocks);
 932 #endif
 933
 934 /* domain.c */
 935 char *get_domain(struct in_addr addr);
 936 #ifdef HAVE_IPV6
 937 char *get_domain6(struct in6_addr *addr);
 938 #endif
 939 int is_name_synthetic(int flags, char *name, struct all_addr *addr);
 940 int is_rev_synth(int flag, struct all_addr *addr, char *name);
 941
 942 /* rfc1035.c */
 943 unsigned int extract_request(struct dns_header *header, size_t qlen,
 944                                char *name, unsigned short *typep);
 945 size_t setup_reply(struct dns_header *header, size_t  qlen,
 946                    struct all_addr *addrp, unsigned int flags,
 947                    unsigned long local_ttl);
 948 int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff,
 949                       time_t now, char **ipsets, int is_sign, int checkrebind,
 950                       int checking_disabled);
 951 size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 952                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 953 int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
 954                              struct bogus_addr *addr, time_t now);
 955 unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
 956                                  size_t *len, unsigned char **p, int *is_sign);
 957 int check_for_local_domain(char *name, time_t now);
 958 unsigned int questions_crc(struct dns_header *header, size_t plen, char *buff);
 959 size_t resize_packet(struct dns_header *header, size_t plen,
 960                   unsigned char *pheader, size_t hlen);
 961 size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
 962 int add_resource_record(struct dns_header *header, char *limit, int *truncp,
 963                         int nameoffset, unsigned char **pp, unsigned long ttl,
 964                         int *offset, unsigned short type, unsigned short class, char *format, ...);
 965 unsigned char *skip_questions(struct dns_header *header, size_t plen);
 966 int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
 967                  char *name, int isExtract, int extrabytes);
 968 int in_arpa_name_2_addr(char *namein, struct all_addr *addrp);
 969
 970 /* auth.c */
 971 #ifdef HAVE_AUTH
 972 size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t now, union mysockaddr *peer_addr);
 973 #endif
 974
 975 /* util.c */
 976 void rand_init(void);
 977 unsigned short rand16(void);
 978 int legal_hostname(char *c);
 979 char *canonicalise(char *s, int *nomem);
 980 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 981 void *safe_malloc(size_t size);
 982 void safe_pipe(int *fd, int read_noblock);
 983 void *whine_malloc(size_t size);
 984 int sa_len(union mysockaddr *addr);
 985 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 986 int hostname_isequal(const char *a, const char *b);
 987 time_t dnsmasq_time(void);
 988 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 989 #ifdef HAVE_IPV6
 990 int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
 991 u64 addr6part(struct in6_addr *addr);
 992 void setaddr6part(struct in6_addr *addr, u64 host);
 993 #endif
 994 int retry_send(void);
 995 void prettyprint_time(char *buf, unsigned int t);
 996 int prettyprint_addr(union mysockaddr *addr, char *buf);
 997 int parse_hex(char *in, unsigned char *out, int maxlen,
 998               unsigned int *wildcard_mask, int *mac_type);
 999 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
1000                   unsigned int mask);
1001 int expand_buf(struct iovec *iov, size_t size);
1002 char *print_mac(char *buff, unsigned char *mac, int len);
1003 void bump_maxfd(int fd, int *max);
1004 int read_write(int fd, unsigned char *packet, int size, int rw);
1005
1006 int wildcard_match(const char* wildcard, const char* match);
1007
1008 /* log.c */
1009 void die(char *message, char *arg1, int exit_code);
1010 int log_start(struct passwd *ent_pw, int errfd);
1011 int log_reopen(char *log_file);
1012 void my_syslog(int priority, const char *format, ...);
1013 void set_log_writer(fd_set *set, int *maxfdp);
1014 void check_log_writer(fd_set *set);
1015 void flush_log(void);
1016
1017 /* option.c */
1018 void read_opts (int argc, char **argv, char *compile_opts);
1019 char *option_string(int prot, unsigned int opt, unsigned char *val,
1020                     int opt_len, char *buf, int buf_len);
1021 void reread_dhcp(void);
1022 void set_option_bool(unsigned int opt);
1023 void reset_option_bool(unsigned int opt);
1024 struct hostsfile *expand_filelist(struct hostsfile *list);
1025 char *parse_server(char *arg, union mysockaddr *addr,
1026                    union mysockaddr *source_addr, char *interface, int *flags);
1027
1028 /* forward.c */
1029 void reply_query(int fd, int family, time_t now);
1030 void receive_query(struct listener *listen, time_t now);
1031 unsigned char *tcp_request(int confd, time_t now,
1032                            union mysockaddr *local_addr, struct in_addr netmask, int auth_dns);
1033 void server_gone(struct server *server);
1034 struct frec *get_new_frec(time_t now, int *wait);
1035 int send_from(int fd, int nowild, char *packet, size_t len,
1036                union mysockaddr *to, struct all_addr *source,
1037                unsigned int iface);
1038
1039 /* network.c */
1040 int indextoname(int fd, int index, char *name);
1041 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
1042 int random_sock(int family);
1043 void pre_allocate_sfds(void);
1044 int reload_servers(char *fname);
1045 void check_servers(void);
1046 int enumerate_interfaces(int reset);
1047 void create_wildcard_listeners(void);
1048 void create_bound_listeners(int die);
1049 int is_dad_listeners(void);
1050 int iface_check(int family, struct all_addr *addr, char *name, int *auth_dns);
1051 int loopback_exception(int fd, int family, struct all_addr *addr, char *name);
1052 int label_exception(int index, int family, struct all_addr *addr);
1053 int fix_fd(int fd);
1054 int tcp_interface(int fd, int af);
1055 #ifdef HAVE_IPV6
1056 int set_ipv6pktinfo(int fd);
1057 #endif
1058 #ifdef HAVE_DHCP6
1059 void join_multicast(int dienow);
1060 #endif
1061
1062 /* dhcp.c */
1063 #ifdef HAVE_DHCP
1064 void dhcp_init(void);
1065 void dhcp_packet(time_t now, int pxe_fd);
1066 struct dhcp_context *address_available(struct dhcp_context *context,
1067                                        struct in_addr addr,
1068                                        struct dhcp_netid *netids);
1069 struct dhcp_context *narrow_context(struct dhcp_context *context,
1070                                     struct in_addr taddr,
1071                                     struct dhcp_netid *netids);
1072 int address_allocate(struct dhcp_context *context,
1073                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
1074                      struct dhcp_netid *netids, time_t now);
1075 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
1076 struct dhcp_config *find_config(struct dhcp_config *configs,
1077                                 struct dhcp_context *context,
1078                                 unsigned char *clid, int clid_len,
1079                                 unsigned char *hwaddr, int hw_len,
1080                                 int hw_type, char *hostname);
1081 void dhcp_read_ethers(void);
1082 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
1083 char *host_from_dns(struct in_addr addr);
1084 #endif
1085
1086 /* lease.c */
1087 #ifdef HAVE_DHCP
1088 void lease_update_file(time_t now);
1089 void lease_update_dns(int force);
1090 void lease_init(time_t now);
1091 struct dhcp_lease *lease4_allocate(struct in_addr addr);
1092 #ifdef HAVE_DHCP6
1093 struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
1094 struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
1095                                int lease_type, int iaid, struct in6_addr *addr);
1096 void lease6_reset(void);
1097 struct dhcp_lease *lease6_find_by_client(struct dhcp_lease *first, int lease_type, unsigned char *clid, int clid_len, int iaid);
1098 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
1099 u64 lease_find_max_addr6(struct dhcp_context *context);
1100 void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
1101 void lease_update_slaac(time_t now);
1102 #endif
1103 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
1104                       unsigned char *clid, int hw_len, int hw_type, int clid_len, time_t now, int force);
1105 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth, char *domain, char *config_domain);
1106 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
1107 void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now);
1108 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
1109                                         unsigned char *clid, int clid_len);
1110 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
1111 struct in_addr lease_find_max_addr(struct dhcp_context *context);
1112 void lease_prune(struct dhcp_lease *target, time_t now);
1113 void lease_update_from_configs(void);
1114 int do_script_run(time_t now);
1115 void rerun_scripts(void);
1116 void lease_find_interfaces(time_t now);
1117 #ifdef HAVE_SCRIPT
1118 void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
1119                          unsigned int len, int delim);
1120 #endif
1121 #endif
1122
1123 /* rfc2131.c */
1124 #ifdef HAVE_DHCP
1125 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
1126                   size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd, struct in_addr fallback);
1127 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
1128                                int clid_len, unsigned char *clid, int *len_out);
1129 #endif
1130
1131 /* dnsmasq.c */
1132 #ifdef HAVE_DHCP
1133 int make_icmp_sock(void);
1134 int icmp_ping(struct in_addr addr);
1135 #endif
1136 void send_alarm(time_t event, time_t now);
1137 void send_event(int fd, int event, int data, char *msg);
1138 void clear_cache_and_reload(time_t now);
1139 void poll_resolv(int force, int do_reload, time_t now);
1140
1141 /* netlink.c */
1142 #ifdef HAVE_LINUX_NETWORK
1143 void netlink_init(void);
1144 void netlink_multicast(time_t now);
1145 #endif
1146
1147 /* bpf.c */
1148 #ifdef HAVE_BSD_NETWORK
1149 void init_bpf(void);
1150 void send_via_bpf(struct dhcp_packet *mess, size_t len,
1151                   struct in_addr iface_addr, struct ifreq *ifr);
1152 #endif
1153
1154 /* bpf.c or netlink.c */
1155 int iface_enumerate(int family, void *parm, int (callback)());
1156
1157 /* dbus.c */
1158 #ifdef HAVE_DBUS
1159 char *dbus_init(void);
1160 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
1161 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
1162 #  ifdef HAVE_DHCP
1163 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
1164 #  endif
1165 #endif
1166
1167 /* ipset.c */
1168 #ifdef HAVE_IPSET
1169 void ipset_init(void);
1170 int add_to_ipset(const char *setname, const struct all_addr *ipaddr, int flags, int remove);
1171 #endif
1172
1173 /* helper.c */
1174 #if defined(HAVE_SCRIPT)
1175 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
1176 void helper_write(void);
1177 void queue_script(int action, struct dhcp_lease *lease,
1178                   char *hostname, time_t now);
1179 #ifdef HAVE_TFTP
1180 void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer);
1181 #endif
1182 int helper_buf_empty(void);
1183 #endif
1184
1185 /* tftp.c */
1186 #ifdef HAVE_TFTP
1187 void tftp_request(struct listener *listen, time_t now);
1188 void check_tftp_listeners(fd_set *rset, time_t now);
1189 int do_tftp_script_run(void);
1190 #endif
1191
1192 /* conntrack.c */
1193 #ifdef HAVE_CONNTRACK
1194 int get_incoming_mark(union mysockaddr *peer_addr, struct all_addr *local_addr,
1195                       int istcp, unsigned int *markp);
1196 #endif
1197
1198 /* dhcp6.c */
1199 #ifdef HAVE_DHCP6
1200 void dhcp6_init(void);
1201 void dhcp6_packet(time_t now);
1202 struct dhcp_context *address6_allocate(struct dhcp_context *context,  unsigned char *clid, int clid_len,
1203                                        int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans);
1204 int config_valid(struct dhcp_config *config, struct dhcp_context *context, struct in6_addr *addr);
1205 struct dhcp_context *address6_available(struct dhcp_context *context,
1206                                         struct in6_addr *taddr,
1207                                         struct dhcp_netid *netids,
1208                                         int plain_range);
1209 struct dhcp_context *address6_valid(struct dhcp_context *context,
1210                                     struct in6_addr *taddr,
1211                                     struct dhcp_netid *netids,
1212                                     int plain_range);
1213 struct dhcp_config *find_config6(struct dhcp_config *configs,
1214                                  struct dhcp_context *context,
1215                                  unsigned char *duid, int duid_len,
1216                                  char *hostname);
1217 struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1218                                             int prefix, u64 addr);
1219 void make_duid(time_t now);
1220 void dhcp_construct_contexts(time_t now);
1221 #endif
1222
1223 /* rfc3315.c */
1224 #ifdef HAVE_DHCP6
1225 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1226                            struct in6_addr *fallback, size_t sz, int is_multicast, time_t now);
1227 void relay_upstream6(struct dhcp_relay *relay, ssize_t sz, struct in6_addr *peer_address, u32 scope_id);
1228
1229 unsigned short relay_reply6( struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface);
1230 #endif
1231
1232 /* dhcp-common.c */
1233 #ifdef HAVE_DHCP
1234 void dhcp_common_init(void);
1235 ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1236 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
1237 struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1238                                  struct dhcp_opt *opts);
1239 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
1240 char *strip_hostname(char *hostname);
1241 void log_tags(struct dhcp_netid *netid, u32 xid);
1242 int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1243 void dhcp_update_configs(struct dhcp_config *configs);
1244 void display_opts(void);
1245 int lookup_dhcp_opt(int prot, char *name);
1246 int lookup_dhcp_len(int prot, int val);
1247 char *option_string(int prot, unsigned int opt, unsigned char *val,
1248                     int opt_len, char *buf, int buf_len);
1249 #ifdef HAVE_LINUX_NETWORK
1250 void bindtodevice(int fd);
1251 #endif
1252 #  ifdef HAVE_DHCP6
1253 void display_opts6(void);
1254 #  endif
1255 void log_context(int family, struct dhcp_context *context);
1256 void log_relay(int family, struct dhcp_relay *relay);
1257 #endif
1258
1259 /* outpacket.c */
1260 #ifdef HAVE_DHCP6
1261 void end_opt6(int container);
1262 int save_counter(int newval);
1263 void *expand(size_t headroom);
1264 int new_opt6(int opt);
1265 void *put_opt6(void *data, size_t len);
1266 void put_opt6_long(unsigned int val);
1267 void put_opt6_short(unsigned int val);
1268 void put_opt6_char(unsigned int val);
1269 void put_opt6_string(char *s);
1270 #endif
1271
1272 /* radv.c */
1273 #ifdef HAVE_DHCP6
1274 void ra_init(time_t now);
1275 void icmp6_packet(time_t now);
1276 time_t periodic_ra(time_t now);
1277 void ra_start_unsolicted(time_t now, struct dhcp_context *context);
1278 #endif
1279
1280 /* slaac.c */
1281 #ifdef HAVE_DHCP6
1282 void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force);
1283 time_t periodic_slaac(time_t now, struct dhcp_lease *leases);
1284 void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases);
1285 #endif