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
 163 /* Exit codes. */
 164 #define EC_GOOD        0
 165 #define EC_BADCONF     1
 166 #define EC_BADNET      2
 167 #define EC_FILE        3
 168 #define EC_NOMEM       4
 169 #define EC_MISC        5
 170 #define EC_INIT_OFFSET 10
 171
 172 /* Min buffer size: we check after adding each record, so there must be
 173    memory for the largest packet, and the largest record so the
 174    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 175    This might be increased is EDNS packet size if greater than the minimum.
 176 */
 177 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 178
 179 /* Trust the compiler dead-code eliminator.... */
 180 #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
 181
 182 #define OPT_BOGUSPRIV      0
 183 #define OPT_FILTER         1
 184 #define OPT_LOG            2
 185 #define OPT_SELFMX         3
 186 #define OPT_NO_HOSTS       4
 187 #define OPT_NO_POLL        5
 188 #define OPT_DEBUG          6
 189 #define OPT_ORDER          7
 190 #define OPT_NO_RESOLV      8
 191 #define OPT_EXPAND         9
 192 #define OPT_LOCALMX        10
 193 #define OPT_NO_NEG         11
 194 #define OPT_NODOTS_LOCAL   12
 195 #define OPT_NOWILD         13
 196 #define OPT_ETHERS         14
 197 #define OPT_RESOLV_DOMAIN  15
 198 #define OPT_NO_FORK        16
 199 #define OPT_AUTHORITATIVE  17
 200 #define OPT_LOCALISE       18
 201 #define OPT_DBUS           19
 202 #define OPT_DHCP_FQDN      20
 203 #define OPT_NO_PING        21
 204 #define OPT_LEASE_RO       22
 205 #define OPT_ALL_SERVERS    23
 206 #define OPT_RELOAD         24
 207 #define OPT_LOCAL_REBIND   25
 208 #define OPT_TFTP_SECURE    26
 209 #define OPT_TFTP_NOBLOCK   27
 210 #define OPT_LOG_OPTS       28
 211 #define OPT_TFTP_APREF     29
 212 #define OPT_NO_OVERRIDE    30
 213 #define OPT_NO_REBIND      31
 214 #define OPT_ADD_MAC        32
 215 #define OPT_DNSSEC         33
 216 #define OPT_CONSEC_ADDR    34
 217 #define OPT_CONNTRACK      35
 218 #define OPT_FQDN_UPDATE    36
 219 #define OPT_RA             37
 220 #define OPT_TFTP_LC        38
 221 #define OPT_LAST           39
 222
 223 /* extra flags for my_syslog, we use a couple of facilities since they are known
 224    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 225 #define MS_TFTP LOG_USER
 226 #define MS_DHCP LOG_DAEMON
 227
 228 struct all_addr {
 229   union {
 230     struct in_addr addr4;
 231 #ifdef HAVE_IPV6
 232     struct in6_addr addr6;
 233 #endif
 234   } addr;
 235 };
 236
 237 struct bogus_addr {
 238   struct in_addr addr;
 239   struct bogus_addr *next;
 240 };
 241
 242 /* dns doctor param */
 243 struct doctor {
 244   struct in_addr in, end, out, mask;
 245   struct doctor *next;
 246 };
 247
 248 struct mx_srv_record {
 249   char *name, *target;
 250   int issrv, srvport, priority, weight;
 251   unsigned int offset;
 252   struct mx_srv_record *next;
 253 };
 254
 255 struct naptr {
 256   char *name, *replace, *regexp, *services, *flags;
 257   unsigned int order, pref;
 258   struct naptr *next;
 259 };
 260
 261 struct txt_record {
 262   char *name;
 263   unsigned char *txt;
 264   unsigned short class, len;
 265   struct txt_record *next;
 266 };
 267
 268 struct ptr_record {
 269   char *name, *ptr;
 270   struct ptr_record *next;
 271 };
 272
 273 struct cname {
 274   char *alias, *target;
 275   struct cname *next;
 276 };
 277
 278 struct host_record {
 279   struct name_list {
 280     char *name;
 281     struct name_list *next;
 282   } *names;
 283   struct in_addr addr;
 284 #ifdef HAVE_IPV6
 285   struct in6_addr addr6;
 286 #endif
 287   struct host_record *next;
 288 };
 289
 290 struct interface_name {
 291   char *name; /* domain name */
 292   char *intr; /* interface name */
 293   struct interface_name *next;
 294 };
 295
 296 union bigname {
 297   char name[MAXDNAME];
 298   union bigname *next; /* freelist */
 299 };
 300
 301 struct keydata {
 302   struct keydata *next;
 303   unsigned char key[KEYBLOCK_LEN];
 304 };
 305
 306 struct crec {
 307   struct crec *next, *prev, *hash_next;
 308   time_t ttd; /* time to die */
 309   int uid;
 310   union {
 311     struct all_addr addr;
 312     struct {
 313       struct crec *cache;
 314       int uid;
 315     } cname;
 316     struct {
 317       struct keydata *keydata;
 318       unsigned char algo;
 319       unsigned char flags;
 320       unsigned short keylen;
 321     } key;
 322   } addr;
 323   unsigned short flags;
 324   union {
 325     char sname[SMALLDNAME];
 326     union bigname *bname;
 327     char *namep;
 328   } name;
 329 };
 330
 331 #define F_IMMORTAL  (1u<<0)
 332 #define F_NAMEP     (1u<<1)
 333 #define F_REVERSE   (1u<<2)
 334 #define F_FORWARD   (1u<<3)
 335 #define F_DHCP      (1u<<4)
 336 #define F_NEG       (1u<<5)
 337 #define F_HOSTS     (1u<<6)
 338 #define F_IPV4      (1u<<7)
 339 #define F_IPV6      (1u<<8)
 340 #define F_BIGNAME   (1u<<9)
 341 #define F_NXDOMAIN  (1u<<10)
 342 #define F_CNAME     (1u<<11)
 343 #define F_DNSKEY    (1u<<12)
 344 #define F_CONFIG    (1u<<13)
 345 #define F_DS        (1u<<14)
 346 #define F_DNSSECOK  (1u<<15)
 347
 348 /* below here are only valid as args to log_query: cache
 349    entries are limited to 16 bits */
 350 #define F_UPSTREAM  (1u<<16)
 351 #define F_RRNAME    (1u<<17)
 352 #define F_SERVER    (1u<<18)
 353 #define F_QUERY     (1u<<19)
 354 #define F_NOERR     (1u<<20)
 355 /* composites */
 356 #define F_TYPE      (F_IPV4 | F_IPV6 | F_DNSKEY | F_DS) /* Only one may be set */
 357
 358
 359
 360 /* struct sockaddr is not large enough to hold any address,
 361    and specifically not big enough to hold an IPv6 address.
 362    Blech. Roll our own. */
 363 union mysockaddr {
 364   struct sockaddr sa;
 365   struct sockaddr_in in;
 366 #if defined(HAVE_IPV6)
 367   struct sockaddr_in6 in6;
 368 #endif
 369 };
 370
 371 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 372 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 373 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 374 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 375 #define SERV_HAS_SOURCE       16  /* source address defined */
 376 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 377 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 378 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 379 #define SERV_MARK            256  /* for mark-and-delete */
 380 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 381 #define SERV_COUNTED         512  /* workspace for log code */
 382 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 383 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 384
 385 struct serverfd {
 386   int fd;
 387   union mysockaddr source_addr;
 388   char interface[IF_NAMESIZE+1];
 389   struct serverfd *next;
 390 };
 391
 392 struct randfd {
 393   int fd;
 394   unsigned short refcount, family;
 395 };
 396
 397 struct server {
 398   union mysockaddr addr, source_addr;
 399   char interface[IF_NAMESIZE+1];
 400   struct serverfd *sfd;
 401   char *domain; /* set if this server only handles a domain. */
 402   int flags, tcpfd;
 403   unsigned int queries, failed_queries;
 404   struct server *next;
 405 };
 406
 407 struct irec {
 408   union mysockaddr addr;
 409   struct in_addr netmask; /* only valid for IPv4 */
 410   int tftp_ok, dhcp_ok, mtu, done, dad;
 411   char *name;
 412   struct irec *next;
 413 };
 414
 415 struct listener {
 416   int fd, tcpfd, tftpfd, family;
 417   struct irec *iface; /* only sometimes valid for non-wildcard */
 418   struct listener *next;
 419 };
 420
 421 /* interface and address parms from command line. */
 422 struct iname {
 423   char *name;
 424   union mysockaddr addr;
 425   int isloop, used;
 426   struct iname *next;
 427 };
 428
 429 /* resolv-file parms from command-line */
 430 struct resolvc {
 431   struct resolvc *next;
 432   int is_default, logged;
 433   time_t mtime;
 434   char *name;
 435 };
 436
 437 /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile */
 438 #define AH_DIR      1
 439 #define AH_INACTIVE 2
 440 struct hostsfile {
 441   struct hostsfile *next;
 442   int flags;
 443   char *fname;
 444   int index; /* matches to cache entries for logging */
 445 };
 446
 447 #define FREC_NOREBIND           1
 448 #define FREC_CHECKING_DISABLED  2
 449
 450 struct frec {
 451   union mysockaddr source;
 452   struct all_addr dest;
 453   struct server *sentto; /* NULL means free */
 454   struct randfd *rfd4;
 455 #ifdef HAVE_IPV6
 456   struct randfd *rfd6;
 457 #endif
 458   unsigned int iface;
 459   unsigned short orig_id, new_id;
 460   int fd, forwardall, flags;
 461   unsigned int crc;
 462   time_t time;
 463   struct frec *next;
 464 };
 465
 466 /* flags in top of length field for DHCP-option tables */
 467 #define OT_ADDR_LIST    0x8000
 468 #define OT_RFC1035_NAME 0x4000
 469 #define OT_INTERNAL     0x2000
 470 #define OT_NAME         0x1000
 471 #define OT_CSTRING      0x0800
 472 #define OT_DEC          0x0400
 473
 474
 475 /* actions in the daemon->helper RPC */
 476 #define ACTION_DEL           1
 477 #define ACTION_OLD_HOSTNAME  2
 478 #define ACTION_OLD           3
 479 #define ACTION_ADD           4
 480 #define ACTION_TFTP          5
 481
 482 #define LEASE_NEW            1  /* newly created */
 483 #define LEASE_CHANGED        2  /* modified */
 484 #define LEASE_AUX_CHANGED    4  /* CLID or expiry changed */
 485 #define LEASE_AUTH_NAME      8  /* hostname came from config, not from client */
 486 #define LEASE_USED          16  /* used this DHCPv6 transaction */
 487 #define LEASE_NA            32  /* IPv6 no-temporary lease */
 488 #define LEASE_TA            64  /* IPv6 temporary lease */
 489 #define LEASE_HAVE_HWADDR  128  /* Have set hwaddress */
 490
 491 struct dhcp_lease {
 492   int clid_len;          /* length of client identifier */
 493   unsigned char *clid;   /* clientid */
 494   char *hostname, *fqdn; /* name from client-hostname option or config */
 495   char *old_hostname;    /* hostname before it moved to another lease */
 496   int flags;
 497   time_t expires;        /* lease expiry */
 498 #ifdef HAVE_BROKEN_RTC
 499   unsigned int length;
 500 #endif
 501   int hwaddr_len, hwaddr_type; /* hw_type used for iaid in v6 */
 502   unsigned char hwaddr[DHCP_CHADDR_MAX]; /* also IPv6 address */
 503   struct in_addr addr, override, giaddr;
 504   unsigned char *extradata;
 505   unsigned int extradata_len, extradata_size;
 506   int last_interface;
 507 #ifdef HAVE_DHCP6
 508   struct slaac_address {
 509     struct in6_addr addr, local;
 510     time_t ping_time;
 511     int backoff; /* zero -> confirmed */
 512     struct slaac_address *next;
 513   } *slaac_address;
 514 #endif
 515   struct dhcp_lease *next;
 516 };
 517
 518 struct dhcp_netid {
 519   char *net;
 520   struct dhcp_netid *next;
 521 };
 522
 523 struct dhcp_netid_list {
 524   struct dhcp_netid *list;
 525   struct dhcp_netid_list *next;
 526 };
 527
 528 struct tag_if {
 529   struct dhcp_netid_list *set;
 530   struct dhcp_netid *tag;
 531   struct tag_if *next;
 532 };
 533
 534 struct hwaddr_config {
 535   int hwaddr_len, hwaddr_type;
 536   unsigned char hwaddr[DHCP_CHADDR_MAX];
 537   unsigned int wildcard_mask;
 538   struct hwaddr_config *next;
 539 };
 540
 541 struct dhcp_config {
 542   unsigned int flags;
 543   int clid_len;          /* length of client identifier */
 544   unsigned char *clid;   /* clientid */
 545   char *hostname, *domain;
 546   struct dhcp_netid_list *netid;
 547 #ifdef HAVE_DHCP6
 548   struct in6_addr addr6;
 549 #endif
 550   struct in_addr addr;
 551   time_t decline_time;
 552   unsigned int lease_time;
 553   struct hwaddr_config *hwaddr;
 554   struct dhcp_config *next;
 555 };
 556
 557 #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
 558
 559 #define CONFIG_DISABLE           1
 560 #define CONFIG_CLID              2
 561 #define CONFIG_TIME              8
 562 #define CONFIG_NAME             16
 563 #define CONFIG_ADDR             32
 564 #define CONFIG_NOCLID          128
 565 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 566 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 567 #define CONFIG_DECLINED       1024    /* address declined by client */
 568 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 569 #define CONFIG_ADDR6          4096
 570
 571 struct dhcp_opt {
 572   int opt, len, flags;
 573   union {
 574     int encap;
 575     unsigned int wildcard_mask;
 576     unsigned char *vendor_class;
 577   } u;
 578   unsigned char *val;
 579   struct dhcp_netid *netid;
 580   struct dhcp_opt *next;
 581 };
 582
 583 #define DHOPT_ADDR               1
 584 #define DHOPT_STRING             2
 585 #define DHOPT_ENCAPSULATE        4
 586 #define DHOPT_ENCAP_MATCH        8
 587 #define DHOPT_FORCE             16
 588 #define DHOPT_BANK              32
 589 #define DHOPT_ENCAP_DONE        64
 590 #define DHOPT_MATCH            128
 591 #define DHOPT_VENDOR           256
 592 #define DHOPT_HEX              512
 593 #define DHOPT_VENDOR_MATCH    1024
 594 #define DHOPT_RFC3925         2048
 595 #define DHOPT_TAGOK           4096
 596 #define DHOPT_ADDR6           8192
 597
 598 struct dhcp_boot {
 599   char *file, *sname, *tftp_sname;
 600   struct in_addr next_server;
 601   struct dhcp_netid *netid;
 602   struct dhcp_boot *next;
 603 };
 604
 605 struct pxe_service {
 606   unsigned short CSA, type;
 607   char *menu, *basename, *sname;
 608   struct in_addr server;
 609   struct dhcp_netid *netid;
 610   struct pxe_service *next;
 611 };
 612
 613 #define MATCH_VENDOR     1
 614 #define MATCH_USER       2
 615 #define MATCH_CIRCUIT    3
 616 #define MATCH_REMOTE     4
 617 #define MATCH_SUBSCRIBER 5
 618
 619 /* vendorclass, userclass, remote-id or cicuit-id */
 620 struct dhcp_vendor {
 621   int len, match_type;
 622   unsigned int enterprise;
 623   char *data;
 624   struct dhcp_netid netid;
 625   struct dhcp_vendor *next;
 626 };
 627
 628 struct dhcp_mac {
 629   unsigned int mask;
 630   int hwaddr_len, hwaddr_type;
 631   unsigned char hwaddr[DHCP_CHADDR_MAX];
 632   struct dhcp_netid netid;
 633   struct dhcp_mac *next;
 634 };
 635
 636 struct dhcp_bridge {
 637   char iface[IF_NAMESIZE];
 638   struct dhcp_bridge *alias, *next;
 639 };
 640
 641 struct cond_domain {
 642   char *domain;
 643   struct in_addr start, end;
 644 #ifdef HAVE_IPV6
 645   struct in6_addr start6, end6;
 646 #endif
 647   int is6;
 648   struct cond_domain *next;
 649 };
 650
 651 struct dhcp_context {
 652   unsigned int lease_time, addr_epoch;
 653   struct in_addr netmask, broadcast;
 654   struct in_addr local, router;
 655   struct in_addr start, end; /* range of available addresses */
 656 #ifdef HAVE_DHCP6
 657   struct in6_addr start6, end6; /* range of available addresses */
 658   struct in6_addr local6;
 659   int prefix, if_index;
 660   time_t ra_time;
 661 #endif
 662   int flags;
 663   char *interface;
 664   struct dhcp_netid netid, *filter;
 665   struct dhcp_context *next, *current;
 666 };
 667
 668 #define CONTEXT_STATIC         1
 669 #define CONTEXT_NETMASK        2
 670 #define CONTEXT_BRDCAST        4
 671 #define CONTEXT_PROXY          8
 672 #define CONTEXT_RA_ONLY       16
 673 #define CONTEXT_RA_DONE       32
 674 #define CONTEXT_RA_NAME       64
 675 #define CONTEXT_RA_STATELESS 128
 676 #define CONTEXT_DHCP         256
 677 #define CONTEXT_DEPRECATE    512
 678
 679 struct ping_result {
 680   struct in_addr addr;
 681   time_t time;
 682   unsigned int hash;
 683   struct ping_result *next;
 684 };
 685
 686 struct tftp_file {
 687   int refcount, fd;
 688   off_t size;
 689   dev_t dev;
 690   ino_t inode;
 691   char filename[];
 692 };
 693
 694 struct tftp_transfer {
 695   int sockfd;
 696   time_t timeout;
 697   int backoff;
 698   unsigned int block, blocksize, expansion;
 699   off_t offset;
 700   union mysockaddr peer;
 701   char opt_blocksize, opt_transize, netascii, carrylf;
 702   struct tftp_file *file;
 703   struct tftp_transfer *next;
 704 };
 705
 706 struct addr_list {
 707   struct in_addr addr;
 708   struct addr_list *next;
 709 };
 710
 711 struct interface_list {
 712   char *interface;
 713   struct interface_list *next;
 714 };
 715
 716 struct tftp_prefix {
 717   char *interface;
 718   char *prefix;
 719   struct tftp_prefix *next;
 720 };
 721
 722
 723 extern struct daemon {
 724   /* datastuctures representing the command-line and
 725      config file arguments. All set (including defaults)
 726      in option.c */
 727
 728   unsigned int options, options2;
 729   struct resolvc default_resolv, *resolv_files;
 730   time_t last_resolv;
 731   struct mx_srv_record *mxnames;
 732   struct naptr *naptr;
 733   struct txt_record *txt;
 734   struct ptr_record *ptr;
 735   struct host_record *host_records, *host_records_tail;
 736   struct cname *cnames;
 737   struct interface_name *int_names;
 738   char *mxtarget;
 739   char *lease_file;
 740   char *username, *groupname, *scriptuser;
 741   char *luascript;
 742   int group_set, osport;
 743   char *domain_suffix;
 744   struct cond_domain *cond_domain;
 745   char *runfile;
 746   char *lease_change_command;
 747   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 748   struct bogus_addr *bogus_addr;
 749   struct server *servers;
 750   int log_fac; /* log facility */
 751   char *log_file; /* optional log file */
 752   int max_logs;  /* queue limit */
 753   int cachesize, ftabsize;
 754   int port, query_port, min_port;
 755   unsigned long local_ttl, neg_ttl, max_ttl;
 756   struct hostsfile *addn_hosts;
 757   struct dhcp_context *dhcp, *dhcp6, *ra_contexts;
 758   struct dhcp_config *dhcp_conf;
 759   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
 760   struct dhcp_vendor *dhcp_vendors;
 761   struct dhcp_mac *dhcp_macs;
 762   struct dhcp_boot *boot_config;
 763   struct pxe_service *pxe_services;
 764   struct tag_if *tag_if;
 765   struct addr_list *override_relays;
 766   int override;
 767   int enable_pxe;
 768   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 769   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 770   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
 771   int dhcp_max, tftp_max;
 772   int dhcp_server_port, dhcp_client_port;
 773   int start_tftp_port, end_tftp_port;
 774   unsigned int min_leasetime;
 775   struct doctor *doctors;
 776   unsigned short edns_pktsz;
 777   char *tftp_prefix;
 778   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 779   struct interface_list *tftp_interfaces; /* interfaces for limited TFTP service */
 780   int tftp_unlimited;
 781   unsigned int duid_enterprise, duid_config_len;
 782   unsigned char *duid_config;
 783
 784   /* globally used stuff for DNS */
 785   char *packet; /* packet buffer */
 786   int packet_buff_sz; /* size of above */
 787   char *namebuff; /* MAXDNAME size buffer */
 788   unsigned int local_answer, queries_forwarded;
 789   struct frec *frec_list;
 790   struct serverfd *sfds;
 791   struct irec *interfaces;
 792   struct listener *listeners;
 793   struct server *last_server;
 794   time_t forwardtime;
 795   int forwardcount;
 796   struct server *srv_save; /* Used for resend on DoD */
 797   size_t packet_len;       /*      "        "        */
 798   struct randfd *rfd_save; /*      "        "        */
 799   pid_t tcp_pids[MAX_PROCS];
 800   struct randfd randomsocks[RANDOM_SOCKS];
 801   int v6pktinfo;
 802
 803   /* DHCP state */
 804   int dhcpfd, helperfd, pxefd;
 805 #if defined(HAVE_LINUX_NETWORK)
 806   int netlinkfd;
 807 #elif defined(HAVE_BSD_NETWORK)
 808   int dhcp_raw_fd, dhcp_icmp_fd;
 809 #endif
 810   struct iovec dhcp_packet;
 811   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
 812   struct ping_result *ping_results;
 813   FILE *lease_stream;
 814   struct dhcp_bridge *bridges;
 815 #ifdef HAVE_DHCP6
 816   int duid_len;
 817   unsigned char *duid;
 818   struct iovec outpacket;
 819   int dhcp6fd, icmp6fd;
 820 #endif
 821   /* DBus stuff */
 822   /* void * here to avoid depending on dbus headers outside dbus.c */
 823   void *dbus;
 824 #ifdef HAVE_DBUS
 825   struct watch *watches;
 826 #endif
 827
 828   /* TFTP stuff */
 829   struct tftp_transfer *tftp_trans, *tftp_done_trans;
 830
 831   /* utility string buffer, hold max sized IP address as string */
 832   char *addrbuff;
 833
 834 } *daemon;
 835
 836 /* cache.c */
 837 void cache_init(void);
 838 void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
 839 char *record_source(int index);
 840 void querystr(char *str, unsigned short type);
 841 struct crec *cache_find_by_addr(struct crec *crecp,
 842                                 struct all_addr *addr, time_t now,
 843                                 unsigned short prot);
 844 struct crec *cache_find_by_name(struct crec *crecp,
 845                                 char *name, time_t now, unsigned short  prot);
 846 void cache_end_insert(void);
 847 void cache_start_insert(void);
 848 struct crec *cache_insert(char *name, struct all_addr *addr,
 849                           time_t now, unsigned long ttl, unsigned short flags);
 850 void cache_reload(void);
 851 void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
 852 struct in_addr a_record_from_hosts(char *name, time_t now);
 853 void cache_unhash_dhcp(void);
 854 void dump_cache(time_t now);
 855 char *cache_get_name(struct crec *crecp);
 856 char *get_domain(struct in_addr addr);
 857 #ifdef HAVE_IPV6
 858 char *get_domain6(struct in6_addr *addr);
 859 #endif
 860 #ifdef HAVE_DNSSEC
 861 struct keydata *keydata_alloc(char *data, size_t len);
 862 void keydata_free(struct keydata *blocks);
 863 #endif
 864
 865 /* rfc1035.c */
 866 unsigned int extract_request(struct dns_header *header, size_t qlen,
 867                                char *name, unsigned short *typep);
 868 size_t setup_reply(struct dns_header *header, size_t  qlen,
 869                    struct all_addr *addrp, unsigned int flags,
 870                    unsigned long local_ttl);
 871 int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff,
 872                       time_t now, int is_sign, int checkrebind, int checking_disabled);
 873 size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 874                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 875 int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
 876                              struct bogus_addr *addr, time_t now);
 877 unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
 878                                  size_t *len, unsigned char **p, int *is_sign);
 879 int check_for_local_domain(char *name, time_t now);
 880 unsigned int questions_crc(struct dns_header *header, size_t plen, char *buff);
 881 size_t resize_packet(struct dns_header *header, size_t plen,
 882                   unsigned char *pheader, size_t hlen);
 883 size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
 884
 885 /* util.c */
 886 void rand_init(void);
 887 unsigned short rand16(void);
 888 int legal_hostname(char *c);
 889 char *canonicalise(char *s, int *nomem);
 890 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 891 void *safe_malloc(size_t size);
 892 void safe_pipe(int *fd, int read_noblock);
 893 void *whine_malloc(size_t size);
 894 int sa_len(union mysockaddr *addr);
 895 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 896 int hostname_isequal(char *a, char *b);
 897 time_t dnsmasq_time(void);
 898 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 899 #ifdef HAVE_IPV6
 900 int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
 901 u64 addr6part(struct in6_addr *addr);
 902 void setaddr6part(struct in6_addr *addr, u64 host);
 903 #endif
 904 int retry_send(void);
 905 void prettyprint_time(char *buf, unsigned int t);
 906 int prettyprint_addr(union mysockaddr *addr, char *buf);
 907 int parse_hex(char *in, unsigned char *out, int maxlen,
 908               unsigned int *wildcard_mask, int *mac_type);
 909 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 910                   unsigned int mask);
 911 int expand_buf(struct iovec *iov, size_t size);
 912 char *print_mac(char *buff, unsigned char *mac, int len);
 913 void bump_maxfd(int fd, int *max);
 914 int read_write(int fd, unsigned char *packet, int size, int rw);
 915
 916 /* log.c */
 917 void die(char *message, char *arg1, int exit_code);
 918 int log_start(struct passwd *ent_pw, int errfd);
 919 int log_reopen(char *log_file);
 920 void my_syslog(int priority, const char *format, ...);
 921 void set_log_writer(fd_set *set, int *maxfdp);
 922 void check_log_writer(fd_set *set);
 923 void flush_log(void);
 924
 925 /* option.c */
 926 void read_opts (int argc, char **argv, char *compile_opts);
 927 char *option_string(int prot, unsigned int opt, unsigned char *val,
 928                     int opt_len, char *buf, int buf_len);
 929 void reread_dhcp(void);
 930 void set_option_bool(unsigned int opt);
 931 struct hostsfile *expand_filelist(struct hostsfile *list);
 932
 933 /* forward.c */
 934 void reply_query(int fd, int family, time_t now);
 935 void receive_query(struct listener *listen, time_t now);
 936 unsigned char *tcp_request(int confd, time_t now,
 937                            union mysockaddr *local_addr, struct in_addr netmask);
 938 void server_gone(struct server *server);
 939 struct frec *get_new_frec(time_t now, int *wait);
 940 int send_from(int fd, int nowild, char *packet, size_t len,
 941                union mysockaddr *to, struct all_addr *source,
 942                unsigned int iface);
 943
 944 /* network.c */
 945 int indextoname(int fd, int index, char *name);
 946 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 947 int random_sock(int family);
 948 void pre_allocate_sfds(void);
 949 int reload_servers(char *fname);
 950 void check_servers(void);
 951 int enumerate_interfaces();
 952 void create_wildcard_listeners(void);
 953 void create_bound_listeners(int die);
 954 int is_dad_listeners(void);
 955 int iface_check(int family, struct all_addr *addr, char *name);
 956 int fix_fd(int fd);
 957 struct in_addr get_ifaddr(char *intr);
 958 #ifdef HAVE_IPV6
 959 int set_ipv6pktinfo(int fd);
 960 #endif
 961
 962 /* dhcp.c */
 963 #ifdef HAVE_DHCP
 964 void dhcp_init(void);
 965 void dhcp_packet(time_t now, int pxe_fd);
 966 struct dhcp_context *address_available(struct dhcp_context *context,
 967                                        struct in_addr addr,
 968                                        struct dhcp_netid *netids);
 969 struct dhcp_context *narrow_context(struct dhcp_context *context,
 970                                     struct in_addr taddr,
 971                                     struct dhcp_netid *netids);
 972 int address_allocate(struct dhcp_context *context,
 973                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 974                      struct dhcp_netid *netids, time_t now);
 975 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 976 struct dhcp_config *find_config(struct dhcp_config *configs,
 977                                 struct dhcp_context *context,
 978                                 unsigned char *clid, int clid_len,
 979                                 unsigned char *hwaddr, int hw_len,
 980                                 int hw_type, char *hostname);
 981 void dhcp_read_ethers(void);
 982 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 983 char *host_from_dns(struct in_addr addr);
 984 #endif
 985
 986 /* lease.c */
 987 #ifdef HAVE_DHCP
 988 void lease_update_file(time_t now);
 989 void lease_update_dns(int force);
 990 void lease_init(time_t now);
 991 struct dhcp_lease *lease4_allocate(struct in_addr addr);
 992 #ifdef HAVE_DHCP6
 993 struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
 994 struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
 995                                int lease_type, int iaid, struct in6_addr *addr);
 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);
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 struct dhcp_context *address6_available(struct dhcp_context *context,
1096                                         struct in6_addr *taddr,
1097                                         struct dhcp_netid *netids);
1098 struct dhcp_context *narrow_context6(struct dhcp_context *context,
1099                                      struct in6_addr *taddr,
1100                                      struct dhcp_netid *netids);
1101 struct dhcp_config *find_config6(struct dhcp_config *configs,
1102                                  struct dhcp_context *context,
1103                                  unsigned char *duid, int duid_len,
1104                                  char *hostname);
1105 struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1106                                             int prefix, u64 addr);
1107 void make_duid(time_t now);
1108 #endif
1109
1110 /* rfc3315.c */
1111 #ifdef HAVE_DHCP6
1112 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1113                            struct in6_addr *fallback, size_t sz, int is_multicast, time_t now);
1114 #endif
1115
1116 /* dhcp-common.c */
1117 #ifdef HAVE_DHCP
1118 void dhcp_common_init(void);
1119 ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1120 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
1121 struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1122                                  struct dhcp_opt *opts);
1123 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
1124 char *strip_hostname(char *hostname);
1125 void log_tags(struct dhcp_netid *netid, u32 xid);
1126 int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1127 void dhcp_update_configs(struct dhcp_config *configs);
1128 void check_dhcp_hosts(int fatal);
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);
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