src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2012 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) 2000-2012 Simon Kelley"
  18
  19 #ifndef NO_LARGEFILE
  20 /* Ensure we can use files >2GB (log files may grow this big) */
  21 #  define _LARGEFILE_SOURCE 1
  22 #  define _FILE_OFFSET_BITS 64
  23 #endif
  24
  25 /* Get linux C library versions and define _GNU_SOURCE for kFreeBSD. */
  26 #if defined(__linux__) || defined(__GLIBC__)
  27 #  ifndef __ANDROID__
  28 #      define _GNU_SOURCE
  29 #  endif
  30 #  include <features.h>
  31 #endif
  32
  33 /* Need these defined early */
  34 #if defined(__sun) || defined(__sun__)
  35 #  define _XPG4_2
  36 #  define __EXTENSIONS__
  37 #endif
  38
  39 /* get these before config.h  for IPv6 stuff... */
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42
  43 #ifdef __APPLE__
  44 /* Define before netinet/in.h to select API. OSX Lion onwards. */
  45 #  define __APPLE_USE_RFC_3542
  46 #endif
  47 #include <netinet/in.h>
  48
  49 /* Also needed before config.h. */
  50 #include <getopt.h>
  51
  52 #include "config.h"
  53
  54 typedef unsigned char u8;
  55 typedef unsigned short u16;
  56 typedef unsigned int u32;
  57 typedef unsigned long long u64;
  58
  59 #include "dns-protocol.h"
  60 #include "dhcp-protocol.h"
  61 #ifdef HAVE_DHCP6
  62 #include "dhcp6-protocol.h"
  63 #include "radv-protocol.h"
  64 #endif
  65
  66 #define gettext_noop(S) (S)
  67 #ifndef LOCALEDIR
  68 #  define _(S) (S)
  69 #else
  70 #  include <libintl.h>
  71 #  include <locale.h>
  72 #  define _(S) gettext(S)
  73 #endif
  74
  75 #include <arpa/inet.h>
  76 #include <sys/stat.h>
  77 #include <sys/ioctl.h>
  78 #if defined(HAVE_SOLARIS_NETWORK)
  79 #  include <sys/sockio.h>
  80 #endif
  81 #include <sys/select.h>
  82 #include <sys/wait.h>
  83 #include <sys/time.h>
  84 #include <sys/un.h>
  85 #include <limits.h>
  86 #include <net/if.h>
  87 #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu)
  88 /* Some solaris net/if./h omit this. */
  89 #  define ifr_mtu  ifr_ifru.ifru_metric
  90 #endif
  91 #include <unistd.h>
  92 #include <stdio.h>
  93 #include <string.h>
  94 #include <stdlib.h>
  95 #include <fcntl.h>
  96 #include <ctype.h>
  97 #include <signal.h>
  98 #include <stddef.h>
  99 #include <time.h>
 100 #include <errno.h>
 101 #include <pwd.h>
 102 #include <grp.h>
 103 #include <stdarg.h>
 104 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__)
 105 #  include <netinet/if_ether.h>
 106 #else
 107 #  include <net/ethernet.h>
 108 #endif
 109 #include <net/if_arp.h>
 110 #include <netinet/in_systm.h>
 111 #include <netinet/ip.h>
 112 #include <netinet/ip_icmp.h>
 113 #include <sys/uio.h>
 114 #include <syslog.h>
 115 #include <dirent.h>
 116 #ifndef HAVE_LINUX_NETWORK
 117 #  include <net/if_dl.h>
 118 #endif
 119
 120 #if defined(HAVE_LINUX_NETWORK)
 121 #include <linux/capability.h>
 122 /* There doesn't seem to be a universally-available
 123    userpace header for these. */
 124 extern int capset(cap_user_header_t header, cap_user_data_t data);
 125 extern int capget(cap_user_header_t header, cap_user_data_t data);
 126 #define LINUX_CAPABILITY_VERSION_1  0x19980330
 127 #define LINUX_CAPABILITY_VERSION_2  0x20071026
 128 #define LINUX_CAPABILITY_VERSION_3  0x20080522
 129
 130 #include <sys/prctl.h>
 131 #elif defined(HAVE_SOLARIS_NETWORK)
 132 #include <priv.h>
 133 #endif
 134
 135 /* daemon is function in the C library.... */
 136 #define daemon dnsmasq_daemon
 137
 138 /* Async event queue */
 139 struct event_desc {
 140   int event, data, msg_sz;
 141 };
 142
 143 #define EVENT_RELOAD    1
 144 #define EVENT_DUMP      2
 145 #define EVENT_ALARM     3
 146 #define EVENT_TERM      4
 147 #define EVENT_CHILD     5
 148 #define EVENT_REOPEN    6
 149 #define EVENT_EXITED    7
 150 #define EVENT_KILLED    8
 151 #define EVENT_EXEC_ERR  9
 152 #define EVENT_PIPE_ERR  10
 153 #define EVENT_USER_ERR  11
 154 #define EVENT_CAP_ERR   12
 155 #define EVENT_PIDFILE   13
 156 #define EVENT_HUSER_ERR 14
 157 #define EVENT_GROUP_ERR 15
 158 #define EVENT_DIE       16
 159 #define EVENT_LOG_ERR   17
 160 #define EVENT_FORK_ERR  18
 161 #define EVENT_LUA_ERR   19
 162 #define EVENT_TFTP_ERR  20
 163
 164 /* Exit codes. */
 165 #define EC_GOOD        0
 166 #define EC_BADCONF     1
 167 #define EC_BADNET      2
 168 #define EC_FILE        3
 169 #define EC_NOMEM       4
 170 #define EC_MISC        5
 171 #define EC_INIT_OFFSET 10
 172
 173 /* Min buffer size: we check after adding each record, so there must be
 174    memory for the largest packet, and the largest record so the
 175    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 176    This might be increased is EDNS packet size if greater than the minimum.
 177 */
 178 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 179
 180 /* Trust the compiler dead-code eliminator.... */
 181 #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
 182
 183 #define OPT_BOGUSPRIV      0
 184 #define OPT_FILTER         1
 185 #define OPT_LOG            2
 186 #define OPT_SELFMX         3
 187 #define OPT_NO_HOSTS       4
 188 #define OPT_NO_POLL        5
 189 #define OPT_DEBUG          6
 190 #define OPT_ORDER          7
 191 #define OPT_NO_RESOLV      8
 192 #define OPT_EXPAND         9
 193 #define OPT_LOCALMX        10
 194 #define OPT_NO_NEG         11
 195 #define OPT_NODOTS_LOCAL   12
 196 #define OPT_NOWILD         13
 197 #define OPT_ETHERS         14
 198 #define OPT_RESOLV_DOMAIN  15
 199 #define OPT_NO_FORK        16
 200 #define OPT_AUTHORITATIVE  17
 201 #define OPT_LOCALISE       18
 202 #define OPT_DBUS           19
 203 #define OPT_DHCP_FQDN      20
 204 #define OPT_NO_PING        21
 205 #define OPT_LEASE_RO       22
 206 #define OPT_ALL_SERVERS    23
 207 #define OPT_RELOAD         24
 208 #define OPT_LOCAL_REBIND   25
 209 #define OPT_TFTP_SECURE    26
 210 #define OPT_TFTP_NOBLOCK   27
 211 #define OPT_LOG_OPTS       28
 212 #define OPT_TFTP_APREF     29
 213 #define OPT_NO_OVERRIDE    30
 214 #define OPT_NO_REBIND      31
 215 #define OPT_ADD_MAC        32
 216 #define OPT_DNSSEC         33
 217 #define OPT_CONSEC_ADDR    34
 218 #define OPT_CONNTRACK      35
 219 #define OPT_FQDN_UPDATE    36
 220 #define OPT_RA             37
 221 #define OPT_TFTP_LC        38
 222 #define OPT_CLEVERBIND     39
 223 #define OPT_TFTP           40
 224 #define OPT_LAST           41
 225
 226 /* extra flags for my_syslog, we use a couple of facilities since they are known
 227    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 228 #define MS_TFTP LOG_USER
 229 #define MS_DHCP LOG_DAEMON
 230
 231 struct all_addr {
 232   union {
 233     struct in_addr addr4;
 234 #ifdef HAVE_IPV6
 235     struct in6_addr addr6;
 236 #endif
 237   } addr;
 238 };
 239
 240 struct bogus_addr {
 241   struct in_addr addr;
 242   struct bogus_addr *next;
 243 };
 244
 245 /* dns doctor param */
 246 struct doctor {
 247   struct in_addr in, end, out, mask;
 248   struct doctor *next;
 249 };
 250
 251 struct mx_srv_record {
 252   char *name, *target;
 253   int issrv, srvport, priority, weight;
 254   unsigned int offset;
 255   struct mx_srv_record *next;
 256 };
 257
 258 struct naptr {
 259   char *name, *replace, *regexp, *services, *flags;
 260   unsigned int order, pref;
 261   struct naptr *next;
 262 };
 263
 264 struct txt_record {
 265   char *name;
 266   unsigned char *txt;
 267   unsigned short class, len;
 268   struct txt_record *next;
 269 };
 270
 271 struct ptr_record {
 272   char *name, *ptr;
 273   struct ptr_record *next;
 274 };
 275
 276 struct cname {
 277   char *alias, *target;
 278   struct cname *next;
 279 };
 280
 281 struct host_record {
 282   struct name_list {
 283     char *name;
 284     struct name_list *next;
 285   } *names;
 286   struct in_addr addr;
 287 #ifdef HAVE_IPV6
 288   struct in6_addr addr6;
 289 #endif
 290   struct host_record *next;
 291 };
 292
 293 struct interface_name {
 294   char *name; /* domain name */
 295   char *intr; /* interface name */
 296   struct interface_name *next;
 297 };
 298
 299 union bigname {
 300   char name[MAXDNAME];
 301   union bigname *next; /* freelist */
 302 };
 303
 304 struct keydata {
 305   struct keydata *next;
 306   unsigned char key[KEYBLOCK_LEN];
 307 };
 308
 309 struct crec {
 310   struct crec *next, *prev, *hash_next;
 311   /* union is 16 bytes when doing IPv6, 8 bytes on 32 bit machines without IPv6 */
 312   union {
 313     struct all_addr addr;
 314     struct {
 315       struct crec *cache;
 316       int uid;
 317     } cname;
 318     struct {
 319       struct keydata *keydata;
 320       unsigned char algo;
 321       unsigned char digest; /* DS only */
 322       unsigned short flags_or_keyid; /* flags for DNSKEY, keyid for DS */
 323     } key;
 324   } addr;
 325   time_t ttd; /* time to die */
 326   /* used as keylen if F_DS or F_DNSKEY, index to source for F_HOSTS */
 327   int uid;
 328   unsigned short flags;
 329   union {
 330     char sname[SMALLDNAME];
 331     union bigname *bname;
 332     char *namep;
 333   } name;
 334 };
 335
 336 #define F_IMMORTAL  (1u<<0)
 337 #define F_NAMEP     (1u<<1)
 338 #define F_REVERSE   (1u<<2)
 339 #define F_FORWARD   (1u<<3)
 340 #define F_DHCP      (1u<<4)
 341 #define F_NEG       (1u<<5)
 342 #define F_HOSTS     (1u<<6)
 343 #define F_IPV4      (1u<<7)
 344 #define F_IPV6      (1u<<8)
 345 #define F_BIGNAME   (1u<<9)
 346 #define F_NXDOMAIN  (1u<<10)
 347 #define F_CNAME     (1u<<11)
 348 #define F_DNSKEY    (1u<<12)
 349 #define F_CONFIG    (1u<<13)
 350 #define F_DS        (1u<<14)
 351 #define F_DNSSECOK  (1u<<15)
 352
 353 /* below here are only valid as args to log_query: cache
 354    entries are limited to 16 bits */
 355 #define F_UPSTREAM  (1u<<16)
 356 #define F_RRNAME    (1u<<17)
 357 #define F_SERVER    (1u<<18)
 358 #define F_QUERY     (1u<<19)
 359 #define F_NOERR     (1u<<20)
 360 /* composites */
 361 #define F_TYPE      (F_IPV4 | F_IPV6 | F_DNSKEY | F_DS) /* Only one may be set */
 362
 363
 364
 365 /* struct sockaddr is not large enough to hold any address,
 366    and specifically not big enough to hold an IPv6 address.
 367    Blech. Roll our own. */
 368 union mysockaddr {
 369   struct sockaddr sa;
 370   struct sockaddr_in in;
 371 #if defined(HAVE_IPV6)
 372   struct sockaddr_in6 in6;
 373 #endif
 374 };
 375
 376 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 377 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 378 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 379 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 380 #define SERV_HAS_SOURCE       16  /* source address defined */
 381 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 382 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 383 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 384 #define SERV_MARK            256  /* for mark-and-delete */
 385 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 386 #define SERV_COUNTED         512  /* workspace for log code */
 387 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 388 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 389
 390 struct serverfd {
 391   int fd;
 392   union mysockaddr source_addr;
 393   char interface[IF_NAMESIZE+1];
 394   struct serverfd *next;
 395 };
 396
 397 struct randfd {
 398   int fd;
 399   unsigned short refcount, family;
 400 };
 401
 402 struct server {
 403   union mysockaddr addr, source_addr;
 404   char interface[IF_NAMESIZE+1];
 405   struct serverfd *sfd;
 406   char *domain; /* set if this server only handles a domain. */
 407   int flags, tcpfd;
 408   unsigned int queries, failed_queries;
 409   struct server *next;
 410 };
 411
 412 struct irec {
 413   union mysockaddr addr;
 414   struct in_addr netmask; /* only valid for IPv4 */
 415   int tftp_ok, dhcp_ok, mtu, done, dad;
 416   char *name;
 417   struct irec *next;
 418 };
 419
 420 struct listener {
 421   int fd, tcpfd, tftpfd, family;
 422   struct irec *iface; /* only sometimes valid for non-wildcard */
 423   struct listener *next;
 424 };
 425
 426 /* interface and address parms from command line. */
 427 struct iname {
 428   char *name;
 429   union mysockaddr addr;
 430   int used;
 431   struct iname *next;
 432 };
 433
 434 /* resolv-file parms from command-line */
 435 struct resolvc {
 436   struct resolvc *next;
 437   int is_default, logged;
 438   time_t mtime;
 439   char *name;
 440 };
 441
 442 /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile */
 443 #define AH_DIR      1
 444 #define AH_INACTIVE 2
 445 struct hostsfile {
 446   struct hostsfile *next;
 447   int flags;
 448   char *fname;
 449   int index; /* matches to cache entries for logging */
 450 };
 451
 452 #define FREC_NOREBIND           1
 453 #define FREC_CHECKING_DISABLED  2
 454
 455 struct frec {
 456   union mysockaddr source;
 457   struct all_addr dest;
 458   struct server *sentto; /* NULL means free */
 459   struct randfd *rfd4;
 460 #ifdef HAVE_IPV6
 461   struct randfd *rfd6;
 462 #endif
 463   unsigned int iface;
 464   unsigned short orig_id, new_id;
 465   int fd, forwardall, flags;
 466   unsigned int crc;
 467   time_t time;
 468   struct frec *next;
 469 };
 470
 471 /* flags in top of length field for DHCP-option tables */
 472 #define OT_ADDR_LIST    0x8000
 473 #define OT_RFC1035_NAME 0x4000
 474 #define OT_INTERNAL     0x2000
 475 #define OT_NAME         0x1000
 476 #define OT_CSTRING      0x0800
 477 #define OT_DEC          0x0400
 478 #define OT_TIME         0x0200
 479
 480 /* actions in the daemon->helper RPC */
 481 #define ACTION_DEL           1
 482 #define ACTION_OLD_HOSTNAME  2
 483 #define ACTION_OLD           3
 484 #define ACTION_ADD           4
 485 #define ACTION_TFTP          5
 486
 487 #define LEASE_NEW            1  /* newly created */
 488 #define LEASE_CHANGED        2  /* modified */
 489 #define LEASE_AUX_CHANGED    4  /* CLID or expiry changed */
 490 #define LEASE_AUTH_NAME      8  /* hostname came from config, not from client */
 491 #define LEASE_USED          16  /* used this DHCPv6 transaction */
 492 #define LEASE_NA            32  /* IPv6 no-temporary lease */
 493 #define LEASE_TA            64  /* IPv6 temporary lease */
 494 #define LEASE_HAVE_HWADDR  128  /* Have set hwaddress */
 495
 496 struct dhcp_lease {
 497   int clid_len;          /* length of client identifier */
 498   unsigned char *clid;   /* clientid */
 499   char *hostname, *fqdn; /* name from client-hostname option or config */
 500   char *old_hostname;    /* hostname before it moved to another lease */
 501   int flags;
 502   time_t expires;        /* lease expiry */
 503 #ifdef HAVE_BROKEN_RTC
 504   unsigned int length;
 505 #endif
 506   int hwaddr_len, hwaddr_type; /* hw_type used for iaid in v6 */
 507   unsigned char hwaddr[DHCP_CHADDR_MAX]; /* also IPv6 address */
 508   struct in_addr addr, override, giaddr;
 509   unsigned char *extradata;
 510   unsigned int extradata_len, extradata_size;
 511   int last_interface;
 512 #ifdef HAVE_DHCP6
 513   struct slaac_address {
 514     struct in6_addr addr, local;
 515     time_t ping_time;
 516     int backoff; /* zero -> confirmed */
 517     struct slaac_address *next;
 518   } *slaac_address;
 519 #endif
 520   struct dhcp_lease *next;
 521 };
 522
 523 struct dhcp_netid {
 524   char *net;
 525   struct dhcp_netid *next;
 526 };
 527
 528 struct dhcp_netid_list {
 529   struct dhcp_netid *list;
 530   struct dhcp_netid_list *next;
 531 };
 532
 533 struct tag_if {
 534   struct dhcp_netid_list *set;
 535   struct dhcp_netid *tag;
 536   struct tag_if *next;
 537 };
 538
 539 struct hwaddr_config {
 540   int hwaddr_len, hwaddr_type;
 541   unsigned char hwaddr[DHCP_CHADDR_MAX];
 542   unsigned int wildcard_mask;
 543   struct hwaddr_config *next;
 544 };
 545
 546 struct dhcp_config {
 547   unsigned int flags;
 548   int clid_len;          /* length of client identifier */
 549   unsigned char *clid;   /* clientid */
 550   char *hostname, *domain;
 551   struct dhcp_netid_list *netid;
 552 #ifdef HAVE_DHCP6
 553   struct in6_addr addr6;
 554 #endif
 555   struct in_addr addr;
 556   time_t decline_time;
 557   unsigned int lease_time;
 558   struct hwaddr_config *hwaddr;
 559   struct dhcp_config *next;
 560 };
 561
 562 #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
 563
 564 #define CONFIG_DISABLE           1
 565 #define CONFIG_CLID              2
 566 #define CONFIG_TIME              8
 567 #define CONFIG_NAME             16
 568 #define CONFIG_ADDR             32
 569 #define CONFIG_NOCLID          128
 570 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 571 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 572 #define CONFIG_DECLINED       1024    /* address declined by client */
 573 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 574 #define CONFIG_ADDR6          4096
 575
 576 struct dhcp_opt {
 577   int opt, len, flags;
 578   union {
 579     int encap;
 580     unsigned int wildcard_mask;
 581     unsigned char *vendor_class;
 582   } u;
 583   unsigned char *val;
 584   struct dhcp_netid *netid;
 585   struct dhcp_opt *next;
 586 };
 587
 588 #define DHOPT_ADDR               1
 589 #define DHOPT_STRING             2
 590 #define DHOPT_ENCAPSULATE        4
 591 #define DHOPT_ENCAP_MATCH        8
 592 #define DHOPT_FORCE             16
 593 #define DHOPT_BANK              32
 594 #define DHOPT_ENCAP_DONE        64
 595 #define DHOPT_MATCH            128
 596 #define DHOPT_VENDOR           256
 597 #define DHOPT_HEX              512
 598 #define DHOPT_VENDOR_MATCH    1024
 599 #define DHOPT_RFC3925         2048
 600 #define DHOPT_TAGOK           4096
 601 #define DHOPT_ADDR6           8192
 602
 603 struct dhcp_boot {
 604   char *file, *sname, *tftp_sname;
 605   struct in_addr next_server;
 606   struct dhcp_netid *netid;
 607   struct dhcp_boot *next;
 608 };
 609
 610 struct pxe_service {
 611   unsigned short CSA, type;
 612   char *menu, *basename, *sname;
 613   struct in_addr server;
 614   struct dhcp_netid *netid;
 615   struct pxe_service *next;
 616 };
 617
 618 #define MATCH_VENDOR     1
 619 #define MATCH_USER       2
 620 #define MATCH_CIRCUIT    3
 621 #define MATCH_REMOTE     4
 622 #define MATCH_SUBSCRIBER 5
 623
 624 /* vendorclass, userclass, remote-id or cicuit-id */
 625 struct dhcp_vendor {
 626   int len, match_type;
 627   unsigned int enterprise;
 628   char *data;
 629   struct dhcp_netid netid;
 630   struct dhcp_vendor *next;
 631 };
 632
 633 struct dhcp_mac {
 634   unsigned int mask;
 635   int hwaddr_len, hwaddr_type;
 636   unsigned char hwaddr[DHCP_CHADDR_MAX];
 637   struct dhcp_netid netid;
 638   struct dhcp_mac *next;
 639 };
 640
 641 struct dhcp_bridge {
 642   char iface[IF_NAMESIZE];
 643   struct dhcp_bridge *alias, *next;
 644 };
 645
 646 struct cond_domain {
 647   char *domain;
 648   struct in_addr start, end;
 649 #ifdef HAVE_IPV6
 650   struct in6_addr start6, end6;
 651 #endif
 652   int is6;
 653   struct cond_domain *next;
 654 };
 655
 656 struct dhcp_context {
 657   unsigned int lease_time, addr_epoch;
 658   struct in_addr netmask, broadcast;
 659   struct in_addr local, router;
 660   struct in_addr start, end; /* range of available addresses */
 661 #ifdef HAVE_DHCP6
 662   struct in6_addr start6, end6; /* range of available addresses */
 663   struct in6_addr local6;
 664   int prefix, if_index;
 665   time_t ra_time;
 666 #endif
 667   int flags;
 668   struct dhcp_netid netid, *filter;
 669   struct dhcp_context *next, *current;
 670 };
 671
 672 #define CONTEXT_STATIC         1
 673 #define CONTEXT_NETMASK        2
 674 #define CONTEXT_BRDCAST        4
 675 #define CONTEXT_PROXY          8
 676 #define CONTEXT_RA_ONLY       16
 677 #define CONTEXT_RA_DONE       32
 678 #define CONTEXT_RA_NAME       64
 679 #define CONTEXT_RA_STATELESS 128
 680 #define CONTEXT_DHCP         256
 681 #define CONTEXT_DEPRECATE    512
 682
 683 struct ping_result {
 684   struct in_addr addr;
 685   time_t time;
 686   unsigned int hash;
 687   struct ping_result *next;
 688 };
 689
 690 struct tftp_file {
 691   int refcount, fd;
 692   off_t size;
 693   dev_t dev;
 694   ino_t inode;
 695   char filename[];
 696 };
 697
 698 struct tftp_transfer {
 699   int sockfd;
 700   time_t timeout;
 701   int backoff;
 702   unsigned int block, blocksize, expansion;
 703   off_t offset;
 704   union mysockaddr peer;
 705   char opt_blocksize, opt_transize, netascii, carrylf;
 706   struct tftp_file *file;
 707   struct tftp_transfer *next;
 708 };
 709
 710 struct addr_list {
 711   struct in_addr addr;
 712   struct addr_list *next;
 713 };
 714
 715 struct tftp_prefix {
 716   char *interface;
 717   char *prefix;
 718   struct tftp_prefix *next;
 719 };
 720
 721
 722 extern struct daemon {
 723   /* datastuctures representing the command-line and
 724      config file arguments. All set (including defaults)
 725      in option.c */
 726
 727   unsigned int options, options2;
 728   struct resolvc default_resolv, *resolv_files;
 729   time_t last_resolv;
 730   struct mx_srv_record *mxnames;
 731   struct naptr *naptr;
 732   struct txt_record *txt, *rr;
 733   struct ptr_record *ptr;
 734   struct host_record *host_records, *host_records_tail;
 735   struct cname *cnames;
 736   struct interface_name *int_names;
 737   char *mxtarget;
 738   char *lease_file;
 739   char *username, *groupname, *scriptuser;
 740   char *luascript;
 741   int group_set, osport;
 742   char *domain_suffix;
 743   struct cond_domain *cond_domain;
 744   char *runfile;
 745   char *lease_change_command;
 746   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 747   struct bogus_addr *bogus_addr;
 748   struct server *servers;
 749   int log_fac; /* log facility */
 750   char *log_file; /* optional log file */
 751   int max_logs;  /* queue limit */
 752   int cachesize, ftabsize;
 753   int port, query_port, min_port;
 754   unsigned long local_ttl, neg_ttl, max_ttl;
 755   struct hostsfile *addn_hosts;
 756   struct dhcp_context *dhcp, *dhcp6, *ra_contexts;
 757   struct dhcp_config *dhcp_conf;
 758   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
 759   struct dhcp_vendor *dhcp_vendors;
 760   struct dhcp_mac *dhcp_macs;
 761   struct dhcp_boot *boot_config;
 762   struct pxe_service *pxe_services;
 763   struct tag_if *tag_if;
 764   struct addr_list *override_relays;
 765   int override;
 766   int enable_pxe;
 767   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 768   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 769   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
 770   int dhcp_max, tftp_max;
 771   int dhcp_server_port, dhcp_client_port;
 772   int start_tftp_port, end_tftp_port;
 773   unsigned int min_leasetime;
 774   struct doctor *doctors;
 775   unsigned short edns_pktsz;
 776   char *tftp_prefix;
 777   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 778   unsigned int duid_enterprise, duid_config_len;
 779   unsigned char *duid_config;
 780   char *dbus_name;
 781
 782   /* globally used stuff for DNS */
 783   char *packet; /* packet buffer */
 784   int packet_buff_sz; /* size of above */
 785   char *namebuff; /* MAXDNAME size buffer */
 786   unsigned int local_answer, queries_forwarded;
 787   struct frec *frec_list;
 788   struct serverfd *sfds;
 789   struct irec *interfaces;
 790   struct listener *listeners;
 791   struct server *last_server;
 792   time_t forwardtime;
 793   int forwardcount;
 794   struct server *srv_save; /* Used for resend on DoD */
 795   size_t packet_len;       /*      "        "        */
 796   struct randfd *rfd_save; /*      "        "        */
 797   pid_t tcp_pids[MAX_PROCS];
 798   struct randfd randomsocks[RANDOM_SOCKS];
 799   int v6pktinfo;
 800
 801   /* DHCP state */
 802   int dhcpfd, helperfd, pxefd;
 803 #if defined(HAVE_LINUX_NETWORK)
 804   int netlinkfd;
 805 #elif defined(HAVE_BSD_NETWORK)
 806   int dhcp_raw_fd, dhcp_icmp_fd;
 807 #endif
 808   struct iovec dhcp_packet;
 809   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
 810   struct ping_result *ping_results;
 811   FILE *lease_stream;
 812   struct dhcp_bridge *bridges;
 813 #ifdef HAVE_DHCP6
 814   int duid_len;
 815   unsigned char *duid;
 816   struct iovec outpacket;
 817   int dhcp6fd, icmp6fd;
 818 #endif
 819   /* DBus stuff */
 820   /* void * here to avoid depending on dbus headers outside dbus.c */
 821   void *dbus;
 822 #ifdef HAVE_DBUS
 823   struct watch *watches;
 824 #endif
 825
 826   /* TFTP stuff */
 827   struct tftp_transfer *tftp_trans, *tftp_done_trans;
 828
 829   /* utility string buffer, hold max sized IP address as string */
 830   char *addrbuff;
 831
 832 } *daemon;
 833
 834 /* cache.c */
 835 void cache_init(void);
 836 void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
 837 char *record_source(int index);
 838 void querystr(char *str, unsigned short type);
 839 struct crec *cache_find_by_addr(struct crec *crecp,
 840                                 struct all_addr *addr, time_t now,
 841                                 unsigned short prot);
 842 struct crec *cache_find_by_name(struct crec *crecp,
 843                                 char *name, time_t now, unsigned short  prot);
 844 void cache_end_insert(void);
 845 void cache_start_insert(void);
 846 struct crec *cache_insert(char *name, struct all_addr *addr,
 847                           time_t now, unsigned long ttl, unsigned short flags);
 848 void cache_reload(void);
 849 void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
 850 struct in_addr a_record_from_hosts(char *name, time_t now);
 851 void cache_unhash_dhcp(void);
 852 void dump_cache(time_t now);
 853 char *cache_get_name(struct crec *crecp);
 854 char *get_domain(struct in_addr addr);
 855 #ifdef HAVE_IPV6
 856 char *get_domain6(struct in6_addr *addr);
 857 #endif
 858 #ifdef HAVE_DNSSEC
 859 struct keydata *keydata_alloc(char *data, size_t len);
 860 void keydata_free(struct keydata *blocks);
 861 #endif
 862
 863 /* rfc1035.c */
 864 unsigned int extract_request(struct dns_header *header, size_t qlen,
 865                                char *name, unsigned short *typep);
 866 size_t setup_reply(struct dns_header *header, size_t  qlen,
 867                    struct all_addr *addrp, unsigned int flags,
 868                    unsigned long local_ttl);
 869 int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff,
 870                       time_t now, int is_sign, int checkrebind, int checking_disabled);
 871 size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 872                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 873 int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
 874                              struct bogus_addr *addr, time_t now);
 875 unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
 876                                  size_t *len, unsigned char **p, int *is_sign);
 877 int check_for_local_domain(char *name, time_t now);
 878 unsigned int questions_crc(struct dns_header *header, size_t plen, char *buff);
 879 size_t resize_packet(struct dns_header *header, size_t plen,
 880                   unsigned char *pheader, size_t hlen);
 881 size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
 882
 883 /* util.c */
 884 void rand_init(void);
 885 unsigned short rand16(void);
 886 int legal_hostname(char *c);
 887 char *canonicalise(char *s, int *nomem);
 888 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 889 void *safe_malloc(size_t size);
 890 void safe_pipe(int *fd, int read_noblock);
 891 void *whine_malloc(size_t size);
 892 int sa_len(union mysockaddr *addr);
 893 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 894 int hostname_isequal(char *a, char *b);
 895 time_t dnsmasq_time(void);
 896 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 897 #ifdef HAVE_IPV6
 898 int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
 899 u64 addr6part(struct in6_addr *addr);
 900 void setaddr6part(struct in6_addr *addr, u64 host);
 901 #endif
 902 int retry_send(void);
 903 void prettyprint_time(char *buf, unsigned int t);
 904 int prettyprint_addr(union mysockaddr *addr, char *buf);
 905 int parse_hex(char *in, unsigned char *out, int maxlen,
 906               unsigned int *wildcard_mask, int *mac_type);
 907 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 908                   unsigned int mask);
 909 int expand_buf(struct iovec *iov, size_t size);
 910 char *print_mac(char *buff, unsigned char *mac, int len);
 911 void bump_maxfd(int fd, int *max);
 912 int read_write(int fd, unsigned char *packet, int size, int rw);
 913
 914 /* log.c */
 915 void die(char *message, char *arg1, int exit_code);
 916 int log_start(struct passwd *ent_pw, int errfd);
 917 int log_reopen(char *log_file);
 918 void my_syslog(int priority, const char *format, ...);
 919 void set_log_writer(fd_set *set, int *maxfdp);
 920 void check_log_writer(fd_set *set);
 921 void flush_log(void);
 922
 923 /* option.c */
 924 void read_opts (int argc, char **argv, char *compile_opts);
 925 char *option_string(int prot, unsigned int opt, unsigned char *val,
 926                     int opt_len, char *buf, int buf_len);
 927 void reread_dhcp(void);
 928 void set_option_bool(unsigned int opt);
 929 void reset_option_bool(unsigned int opt);
 930 struct hostsfile *expand_filelist(struct hostsfile *list);
 931
 932 /* forward.c */
 933 void reply_query(int fd, int family, time_t now);
 934 void receive_query(struct listener *listen, time_t now);
 935 unsigned char *tcp_request(int confd, time_t now,
 936                            union mysockaddr *local_addr, struct in_addr netmask);
 937 void server_gone(struct server *server);
 938 struct frec *get_new_frec(time_t now, int *wait);
 939 int send_from(int fd, int nowild, char *packet, size_t len,
 940                union mysockaddr *to, struct all_addr *source,
 941                unsigned int iface);
 942
 943 /* network.c */
 944 int indextoname(int fd, int index, char *name);
 945 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 946 int random_sock(int family);
 947 void pre_allocate_sfds(void);
 948 int reload_servers(char *fname);
 949 void check_servers(void);
 950 int enumerate_interfaces();
 951 void create_wildcard_listeners(void);
 952 void create_bound_listeners(int die);
 953 int is_dad_listeners(void);
 954 int iface_check(int family, struct all_addr *addr, char *name);
 955 int fix_fd(int fd);
 956 struct in_addr get_ifaddr(char *intr);
 957 #ifdef HAVE_IPV6
 958 int set_ipv6pktinfo(int fd);
 959 #endif
 960
 961 /* dhcp.c */
 962 #ifdef HAVE_DHCP
 963 void dhcp_init(void);
 964 void dhcp_packet(time_t now, int pxe_fd);
 965 struct dhcp_context *address_available(struct dhcp_context *context,
 966                                        struct in_addr addr,
 967                                        struct dhcp_netid *netids);
 968 struct dhcp_context *narrow_context(struct dhcp_context *context,
 969                                     struct in_addr taddr,
 970                                     struct dhcp_netid *netids);
 971 int address_allocate(struct dhcp_context *context,
 972                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 973                      struct dhcp_netid *netids, time_t now);
 974 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 975 struct dhcp_config *find_config(struct dhcp_config *configs,
 976                                 struct dhcp_context *context,
 977                                 unsigned char *clid, int clid_len,
 978                                 unsigned char *hwaddr, int hw_len,
 979                                 int hw_type, char *hostname);
 980 void dhcp_read_ethers(void);
 981 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 982 char *host_from_dns(struct in_addr addr);
 983 #endif
 984
 985 /* lease.c */
 986 #ifdef HAVE_DHCP
 987 void lease_update_file(time_t now);
 988 void lease_update_dns(int force);
 989 void lease_init(time_t now);
 990 struct dhcp_lease *lease4_allocate(struct in_addr addr);
 991 #ifdef HAVE_DHCP6
 992 struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
 993 struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
 994                                int lease_type, int iaid, struct in6_addr *addr);
 995 void lease6_filter(int lease_type, int iaid, struct dhcp_context *context);
 996 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
 997 u64 lease_find_max_addr6(struct dhcp_context *context);
 998 void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
 999 #endif
1000 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
1001                       unsigned char *clid, int hw_len, int hw_type, int clid_len, time_t now, int force);
1002 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth, char *domain, char *config_domain);
1003 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
1004 void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now);
1005 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
1006                                         unsigned char *clid, int clid_len);
1007 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
1008 struct in_addr lease_find_max_addr(struct dhcp_context *context);
1009 void lease_prune(struct dhcp_lease *target, time_t now);
1010 void lease_update_from_configs(void);
1011 int do_script_run(time_t now);
1012 void rerun_scripts(void);
1013 void lease_find_interfaces(time_t now);
1014 #ifdef HAVE_SCRIPT
1015 void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
1016                          unsigned int len, int delim);
1017 #endif
1018 #endif
1019
1020 /* rfc2131.c */
1021 #ifdef HAVE_DHCP
1022 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
1023                   size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd, struct in_addr fallback);
1024 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
1025                                int clid_len, unsigned char *clid, int *len_out);
1026 #endif
1027
1028 /* dnsmasq.c */
1029 #ifdef HAVE_DHCP
1030 int make_icmp_sock(void);
1031 int icmp_ping(struct in_addr addr);
1032 #endif
1033 void send_alarm(time_t event, time_t now);
1034 void send_event(int fd, int event, int data, char *msg);
1035 void clear_cache_and_reload(time_t now);
1036 void poll_resolv(int force, int do_reload, time_t now);
1037
1038 /* netlink.c */
1039 #ifdef HAVE_LINUX_NETWORK
1040 void netlink_init(void);
1041 void netlink_multicast(void);
1042 #endif
1043
1044 /* bpf.c */
1045 #ifdef HAVE_BSD_NETWORK
1046 void init_bpf(void);
1047 void send_via_bpf(struct dhcp_packet *mess, size_t len,
1048                   struct in_addr iface_addr, struct ifreq *ifr);
1049 #endif
1050
1051 /* bpf.c or netlink.c */
1052 int iface_enumerate(int family, void *parm, int (callback)());
1053
1054 /* dbus.c */
1055 #ifdef HAVE_DBUS
1056 char *dbus_init(void);
1057 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
1058 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
1059 #  ifdef HAVE_DHCP
1060 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
1061 #  endif
1062 #endif
1063
1064 /* helper.c */
1065 #if defined(HAVE_SCRIPT)
1066 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
1067 void helper_write(void);
1068 void queue_script(int action, struct dhcp_lease *lease,
1069                   char *hostname, time_t now);
1070 #ifdef HAVE_TFTP
1071 void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer);
1072 #endif
1073 int helper_buf_empty(void);
1074 #endif
1075
1076 /* tftp.c */
1077 #ifdef HAVE_TFTP
1078 void tftp_request(struct listener *listen, time_t now);
1079 void check_tftp_listeners(fd_set *rset, time_t now);
1080 int do_tftp_script_run(void);
1081 #endif
1082
1083 /* conntrack.c */
1084 #ifdef HAVE_CONNTRACK
1085 int get_incoming_mark(union mysockaddr *peer_addr, struct all_addr *local_addr,
1086                       int istcp, unsigned int *markp);
1087 #endif
1088
1089 /* dhcp6.c */
1090 #ifdef HAVE_DHCP6
1091 void dhcp6_init(void);
1092 void dhcp6_packet(time_t now);
1093 int address6_allocate(struct dhcp_context *context,  unsigned char *clid, int clid_len,
1094                       int serial, struct dhcp_netid *netids, struct in6_addr *ans);
1095 int is_addr_in_context6(struct dhcp_context *context, struct in6_addr *addr);
1096 struct dhcp_context *address6_available(struct dhcp_context *context,
1097                                         struct in6_addr *taddr,
1098                                         struct dhcp_netid *netids);
1099 struct dhcp_context *narrow_context6(struct dhcp_context *context,
1100                                      struct in6_addr *taddr,
1101                                      struct dhcp_netid *netids);
1102 struct dhcp_config *find_config6(struct dhcp_config *configs,
1103                                  struct dhcp_context *context,
1104                                  unsigned char *duid, int duid_len,
1105                                  char *hostname);
1106 struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1107                                             int prefix, u64 addr);
1108 void make_duid(time_t now);
1109 #endif
1110
1111 /* rfc3315.c */
1112 #ifdef HAVE_DHCP6
1113 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1114                            struct in6_addr *fallback, size_t sz, int is_multicast, time_t now);
1115 #endif
1116
1117 /* dhcp-common.c */
1118 #ifdef HAVE_DHCP
1119 void dhcp_common_init(void);
1120 ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1121 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
1122 struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1123                                  struct dhcp_opt *opts);
1124 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
1125 char *strip_hostname(char *hostname);
1126 void log_tags(struct dhcp_netid *netid, u32 xid);
1127 int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1128 void dhcp_update_configs(struct dhcp_config *configs);
1129 void display_opts(void);
1130 u16 lookup_dhcp_opt(int prot, char *name);
1131 u16 lookup_dhcp_len(int prot, u16 val);
1132 char *option_string(int prot, unsigned int opt, unsigned char *val,
1133                     int opt_len, char *buf, int buf_len);
1134 #ifdef HAVE_LINUX_NETWORK
1135 void bindtodevice(int fd);
1136 #endif
1137 #  ifdef HAVE_DHCP6
1138 void display_opts6(void);
1139 void join_multicast(void);
1140 #  endif
1141 #endif
1142
1143 /* outpacket.c */
1144 #ifdef HAVE_DHCP6
1145 void end_opt6(int container);
1146 int save_counter(int newval);
1147 void *expand(size_t headroom);
1148 int new_opt6(int opt);
1149 void *put_opt6(void *data, size_t len);
1150 void put_opt6_long(unsigned int val);
1151 void put_opt6_short(unsigned int val);
1152 void put_opt6_char(unsigned int val);
1153 void put_opt6_string(char *s);
1154 #endif
1155
1156 /* radv.c */
1157 #ifdef HAVE_DHCP6
1158 void ra_init(time_t now);
1159 void icmp6_packet(void);
1160 time_t periodic_ra(time_t now);
1161 void ra_start_unsolicted(time_t now, struct dhcp_context *context);
1162 #endif
1163
1164 /* slaac.c */
1165 #ifdef HAVE_DHCP6
1166 void build_subnet_map(void);
1167 void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force);
1168 time_t periodic_slaac(time_t now, struct dhcp_lease *leases);
1169 void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases);
1170 void schedule_subnet_map(void);
1171 #endif