release/src/router/dnsmasq/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_LAST           38
 221
 222 /* extra flags for my_syslog, we use a couple of facilities since they are known
 223    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 224 #define MS_TFTP LOG_USER
 225 #define MS_DHCP LOG_DAEMON
 226
 227 struct all_addr {
 228   union {
 229     struct in_addr addr4;
 230 #ifdef HAVE_IPV6
 231     struct in6_addr addr6;
 232 #endif
 233   } addr;
 234 };
 235
 236 struct bogus_addr {
 237   struct in_addr addr;
 238   struct bogus_addr *next;
 239 };
 240
 241 /* dns doctor param */
 242 struct doctor {
 243   struct in_addr in, end, out, mask;
 244   struct doctor *next;
 245 };
 246
 247 struct mx_srv_record {
 248   char *name, *target;
 249   int issrv, srvport, priority, weight;
 250   unsigned int offset;
 251   struct mx_srv_record *next;
 252 };
 253
 254 struct naptr {
 255   char *name, *replace, *regexp, *services, *flags;
 256   unsigned int order, pref;
 257   struct naptr *next;
 258 };
 259
 260 struct txt_record {
 261   char *name;
 262   unsigned char *txt;
 263   unsigned short class, len;
 264   struct txt_record *next;
 265 };
 266
 267 struct ptr_record {
 268   char *name, *ptr;
 269   struct ptr_record *next;
 270 };
 271
 272 struct cname {
 273   char *alias, *target;
 274   struct cname *next;
 275 };
 276
 277 struct interface_name {
 278   char *name; /* domain name */
 279   char *intr; /* interface name */
 280   struct interface_name *next;
 281 };
 282
 283 union bigname {
 284   char name[MAXDNAME];
 285   union bigname *next; /* freelist */
 286 };
 287
 288 struct crec {
 289   struct crec *next, *prev, *hash_next;
 290   time_t ttd; /* time to die */
 291   int uid;
 292   union {
 293     struct all_addr addr;
 294     struct {
 295       struct crec *cache;
 296       int uid;
 297     } cname;
 298   } addr;
 299   unsigned short flags;
 300   union {
 301     char sname[SMALLDNAME];
 302     union bigname *bname;
 303     char *namep;
 304   } name;
 305 };
 306
 307 #define F_IMMORTAL  (1u<<0)
 308 #define F_NAMEP     (1u<<1)
 309 #define F_REVERSE   (1u<<2)
 310 #define F_FORWARD   (1u<<3)
 311 #define F_DHCP      (1u<<4)
 312 #define F_NEG       (1u<<5)
 313 #define F_HOSTS     (1u<<6)
 314 #define F_IPV4      (1u<<7)
 315 #define F_IPV6      (1u<<8)
 316 #define F_BIGNAME   (1u<<9)
 317 #define F_NXDOMAIN  (1u<<10)
 318 #define F_CNAME     (1u<<11)
 319 #define F_NOERR     (1u<<12)
 320 #define F_CONFIG    (1u<<13)
 321 /* below here are only valid as args to log_query: cache
 322    entries are limited to 16 bits */
 323 #define F_UPSTREAM  (1u<<16)
 324 #define F_RRNAME    (1u<<17)
 325 #define F_SERVER    (1u<<18)
 326 #define F_QUERY     (1u<<19)
 327
 328
 329 /* struct sockaddr is not large enough to hold any address,
 330    and specifically not big enough to hold an IPv6 address.
 331    Blech. Roll our own. */
 332 union mysockaddr {
 333   struct sockaddr sa;
 334   struct sockaddr_in in;
 335 #if defined(HAVE_IPV6)
 336   struct sockaddr_in6 in6;
 337 #endif
 338 };
 339
 340 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 341 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 342 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 343 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 344 #define SERV_HAS_SOURCE       16  /* source address defined */
 345 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 346 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 347 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 348 #define SERV_MARK            256  /* for mark-and-delete */
 349 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 350 #define SERV_COUNTED         512  /* workspace for log code */
 351 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 352 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 353
 354 struct serverfd {
 355   int fd;
 356   union mysockaddr source_addr;
 357   char interface[IF_NAMESIZE+1];
 358   struct serverfd *next;
 359 };
 360
 361 struct randfd {
 362   int fd;
 363   unsigned short refcount, family;
 364 };
 365
 366 struct server {
 367   union mysockaddr addr, source_addr;
 368   char interface[IF_NAMESIZE+1];
 369   struct serverfd *sfd;
 370   char *domain; /* set if this server only handles a domain. */
 371   int flags, tcpfd;
 372   unsigned int queries, failed_queries;
 373   struct server *next;
 374 };
 375
 376 struct irec {
 377   union mysockaddr addr;
 378   struct in_addr netmask; /* only valid for IPv4 */
 379   int tftp_ok, mtu, done, dad;
 380   char *name;
 381   struct irec *next;
 382 };
 383
 384 struct listener {
 385   int fd, tcpfd, tftpfd, family;
 386   struct irec *iface; /* only valid for non-wildcard */
 387   struct listener *next;
 388 };
 389
 390 /* interface and address parms from command line. */
 391 struct iname {
 392   char *name;
 393   union mysockaddr addr;
 394   int isloop, used;
 395   struct iname *next;
 396 };
 397
 398 /* resolv-file parms from command-line */
 399 struct resolvc {
 400   struct resolvc *next;
 401   int is_default, logged;
 402   time_t mtime;
 403   char *name;
 404 };
 405
 406 /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile */
 407 #define AH_DIR      1
 408 #define AH_INACTIVE 2
 409 struct hostsfile {
 410   struct hostsfile *next;
 411   int flags;
 412   char *fname;
 413   int index; /* matches to cache entries for logging */
 414 };
 415
 416 #define FREC_NOREBIND           1
 417 #define FREC_CHECKING_DISABLED  2
 418
 419 struct frec {
 420   union mysockaddr source;
 421   struct all_addr dest;
 422   struct server *sentto; /* NULL means free */
 423   struct randfd *rfd4;
 424 #ifdef HAVE_IPV6
 425   struct randfd *rfd6;
 426 #endif
 427   unsigned int iface;
 428   unsigned short orig_id, new_id;
 429   int fd, forwardall, flags;
 430   unsigned int crc;
 431   time_t time;
 432   struct frec *next;
 433 };
 434
 435 /* actions in the daemon->helper RPC */
 436 #define ACTION_DEL           1
 437 #define ACTION_OLD_HOSTNAME  2
 438 #define ACTION_OLD           3
 439 #define ACTION_ADD           4
 440
 441 #define LEASE_NEW            1  /* newly created */
 442 #define LEASE_CHANGED        2  /* modified */
 443 #define LEASE_AUX_CHANGED    4  /* CLID or expiry changed */
 444 #define LEASE_AUTH_NAME      8  /* hostname came from config, not from client */
 445 #define LEASE_USED          16  /* used this DHCPv6 transaction */
 446 #define LEASE_NA            32  /* IPv6 no-temporary lease */
 447 #define LEASE_TA            64  /* IPv6 temporary lease */
 448
 449 struct dhcp_lease {
 450   int clid_len;          /* length of client identifier */
 451   unsigned char *clid;   /* clientid */
 452   char *hostname, *fqdn; /* name from client-hostname option or config */
 453   char *old_hostname;    /* hostname before it moved to another lease */
 454   int flags;
 455   time_t expires;        /* lease expiry */
 456 #ifdef HAVE_BROKEN_RTC
 457   unsigned int length;
 458 #endif
 459   int hwaddr_len, hwaddr_type; /* hw_type used for iaid in v6 */
 460   unsigned char hwaddr[DHCP_CHADDR_MAX]; /* also IPv6 address */
 461   struct in_addr addr, override, giaddr;
 462   unsigned char *extradata;
 463   unsigned int extradata_len, extradata_size;
 464   int last_interface;
 465   struct dhcp_lease *next;
 466 };
 467
 468 struct dhcp_netid {
 469   char *net;
 470   struct dhcp_netid *next;
 471 };
 472
 473 struct dhcp_netid_list {
 474   struct dhcp_netid *list;
 475   struct dhcp_netid_list *next;
 476 };
 477
 478 struct tag_if {
 479   struct dhcp_netid_list *set;
 480   struct dhcp_netid *tag;
 481   struct tag_if *next;
 482 };
 483
 484 struct hwaddr_config {
 485   int hwaddr_len, hwaddr_type;
 486   unsigned char hwaddr[DHCP_CHADDR_MAX];
 487   unsigned int wildcard_mask;
 488   struct hwaddr_config *next;
 489 };
 490
 491 struct dhcp_config {
 492   unsigned int flags;
 493   int clid_len;          /* length of client identifier */
 494   unsigned char *clid;   /* clientid */
 495   char *hostname, *domain;
 496   struct dhcp_netid_list *netid;
 497 #ifdef HAVE_DHCP6
 498   struct in6_addr addr6;
 499 #endif
 500   struct in_addr addr;
 501   time_t decline_time;
 502   unsigned int lease_time;
 503   struct hwaddr_config *hwaddr;
 504   struct dhcp_config *next;
 505 };
 506
 507 #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
 508
 509 #define CONFIG_DISABLE           1
 510 #define CONFIG_CLID              2
 511 #define CONFIG_TIME              8
 512 #define CONFIG_NAME             16
 513 #define CONFIG_ADDR             32
 514 #define CONFIG_NOCLID          128
 515 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 516 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 517 #define CONFIG_DECLINED       1024    /* address declined by client */
 518 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 519 #define CONFIG_ADDR6          4096
 520
 521 struct dhcp_opt {
 522   int opt, len, flags;
 523   union {
 524     int encap;
 525     unsigned int wildcard_mask;
 526     unsigned char *vendor_class;
 527   } u;
 528   unsigned char *val;
 529   struct dhcp_netid *netid;
 530   struct dhcp_opt *next;
 531 };
 532
 533 #define DHOPT_ADDR               1
 534 #define DHOPT_STRING             2
 535 #define DHOPT_ENCAPSULATE        4
 536 #define DHOPT_ENCAP_MATCH        8
 537 #define DHOPT_FORCE             16
 538 #define DHOPT_BANK              32
 539 #define DHOPT_ENCAP_DONE        64
 540 #define DHOPT_MATCH            128
 541 #define DHOPT_VENDOR           256
 542 #define DHOPT_HEX              512
 543 #define DHOPT_VENDOR_MATCH    1024
 544 #define DHOPT_RFC3925         2048
 545 #define DHOPT_TAGOK           4096
 546 #define DHOPT_ADDR6           8192
 547
 548 struct dhcp_boot {
 549   char *file, *sname, *tftp_sname;
 550   struct in_addr next_server;
 551   struct dhcp_netid *netid;
 552   struct dhcp_boot *next;
 553 };
 554
 555 struct pxe_service {
 556   unsigned short CSA, type;
 557   char *menu, *basename, *sname;
 558   struct in_addr server;
 559   struct dhcp_netid *netid;
 560   struct pxe_service *next;
 561 };
 562
 563 #define MATCH_VENDOR     1
 564 #define MATCH_USER       2
 565 #define MATCH_CIRCUIT    3
 566 #define MATCH_REMOTE     4
 567 #define MATCH_SUBSCRIBER 5
 568
 569 /* vendorclass, userclass, remote-id or cicuit-id */
 570 struct dhcp_vendor {
 571   int len, match_type;
 572   unsigned int enterprise;
 573   char *data;
 574   struct dhcp_netid netid;
 575   struct dhcp_vendor *next;
 576 };
 577
 578 struct dhcp_mac {
 579   unsigned int mask;
 580   int hwaddr_len, hwaddr_type;
 581   unsigned char hwaddr[DHCP_CHADDR_MAX];
 582   struct dhcp_netid netid;
 583   struct dhcp_mac *next;
 584 };
 585
 586 struct dhcp_bridge {
 587   char iface[IF_NAMESIZE];
 588   struct dhcp_bridge *alias, *next;
 589 };
 590
 591 struct cond_domain {
 592   char *domain;
 593   struct in_addr start, end;
 594 #ifdef HAVE_IPV6
 595   struct in6_addr start6, end6;
 596 #endif
 597   int is6;
 598   struct cond_domain *next;
 599 };
 600
 601 struct dhcp_context {
 602   unsigned int lease_time, addr_epoch;
 603   struct in_addr netmask, broadcast;
 604   struct in_addr local, router;
 605   struct in_addr start, end; /* range of available addresses */
 606 #ifdef HAVE_DHCP6
 607   struct in6_addr start6, end6; /* range of available addresses */
 608   struct in6_addr local6;
 609   int prefix;
 610   time_t ra_time;
 611 #endif
 612   int flags;
 613   char *interface;
 614   struct dhcp_netid netid, *filter;
 615   struct dhcp_context *next, *current;
 616 };
 617
 618 #define CONTEXT_STATIC    1
 619 #define CONTEXT_NETMASK   2
 620 #define CONTEXT_BRDCAST   4
 621 #define CONTEXT_PROXY     8
 622 #define CONTEXT_RA_ONLY  16
 623 #define CONTEXT_RA_DONE  32
 624
 625 struct ping_result {
 626   struct in_addr addr;
 627   time_t time;
 628   unsigned int hash;
 629   struct ping_result *next;
 630 };
 631
 632 struct tftp_file {
 633   int refcount, fd;
 634   off_t size;
 635   dev_t dev;
 636   ino_t inode;
 637   char filename[];
 638 };
 639
 640 struct tftp_transfer {
 641   int sockfd;
 642   time_t timeout;
 643   int backoff;
 644   unsigned int block, blocksize, expansion;
 645   off_t offset;
 646   union mysockaddr peer;
 647   char opt_blocksize, opt_transize, netascii, carrylf;
 648   struct tftp_file *file;
 649   struct tftp_transfer *next;
 650 };
 651
 652 struct addr_list {
 653   struct in_addr addr;
 654   struct addr_list *next;
 655 };
 656
 657 struct interface_list {
 658   char *interface;
 659   struct interface_list *next;
 660 };
 661
 662 struct tftp_prefix {
 663   char *interface;
 664   char *prefix;
 665   struct tftp_prefix *next;
 666 };
 667
 668
 669 extern struct daemon {
 670   /* datastuctures representing the command-line and
 671      config file arguments. All set (including defaults)
 672      in option.c */
 673
 674   unsigned int options, options2;
 675   struct resolvc default_resolv, *resolv_files;
 676   time_t last_resolv;
 677   struct mx_srv_record *mxnames;
 678   struct naptr *naptr;
 679   struct txt_record *txt;
 680   struct ptr_record *ptr;
 681   struct cname *cnames;
 682   struct interface_name *int_names;
 683   char *mxtarget;
 684   char *lease_file;
 685   char *username, *groupname, *scriptuser;
 686   char *luascript;
 687   int group_set, osport;
 688   char *domain_suffix;
 689   struct cond_domain *cond_domain;
 690   char *runfile;
 691   char *lease_change_command;
 692   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 693   struct bogus_addr *bogus_addr;
 694   struct server *servers;
 695   int log_fac; /* log facility */
 696   char *log_file; /* optional log file */
 697   int max_logs;  /* queue limit */
 698   int cachesize, ftabsize;
 699   int port, query_port, min_port;
 700   unsigned long local_ttl, neg_ttl, max_ttl;
 701   struct hostsfile *addn_hosts;
 702   struct dhcp_context *dhcp, *dhcp6, *ra_contexts;
 703   struct dhcp_config *dhcp_conf;
 704   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
 705   struct dhcp_vendor *dhcp_vendors;
 706   struct dhcp_mac *dhcp_macs;
 707   struct dhcp_boot *boot_config;
 708   struct pxe_service *pxe_services;
 709   struct tag_if *tag_if;
 710   struct addr_list *override_relays;
 711   int override;
 712   int enable_pxe;
 713   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 714   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 715   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
 716   int dhcp_max, tftp_max;
 717   int dhcp_server_port, dhcp_client_port;
 718   int start_tftp_port, end_tftp_port;
 719   unsigned int min_leasetime;
 720   struct doctor *doctors;
 721   unsigned short edns_pktsz;
 722   char *tftp_prefix;
 723   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 724   struct interface_list *tftp_interfaces; /* interfaces for limited TFTP service */
 725   int tftp_unlimited;
 726
 727   /* globally used stuff for DNS */
 728   char *packet; /* packet buffer */
 729   int packet_buff_sz; /* size of above */
 730   char *namebuff; /* MAXDNAME size buffer */
 731   unsigned int local_answer, queries_forwarded;
 732   struct frec *frec_list;
 733   struct serverfd *sfds;
 734   struct irec *interfaces;
 735   struct listener *listeners;
 736   struct server *last_server;
 737   time_t forwardtime;
 738   int forwardcount;
 739   struct server *srv_save; /* Used for resend on DoD */
 740   size_t packet_len;       /*      "        "        */
 741   struct randfd *rfd_save; /*      "        "        */
 742   pid_t tcp_pids[MAX_PROCS];
 743   struct randfd randomsocks[RANDOM_SOCKS];
 744   int v6pktinfo;
 745
 746   /* DHCP state */
 747   int dhcpfd, helperfd, pxefd;
 748 #if defined(HAVE_LINUX_NETWORK)
 749   int netlinkfd;
 750 #elif defined(HAVE_BSD_NETWORK)
 751   int dhcp_raw_fd, dhcp_icmp_fd;
 752 #endif
 753   struct iovec dhcp_packet;
 754   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
 755   struct ping_result *ping_results;
 756   FILE *lease_stream;
 757   struct dhcp_bridge *bridges;
 758 #ifdef HAVE_DHCP6
 759   int duid_len;
 760   unsigned char *duid;
 761   struct iovec outpacket;
 762   int dhcp6fd, icmp6fd;
 763 #endif
 764   /* DBus stuff */
 765   /* void * here to avoid depending on dbus headers outside dbus.c */
 766   void *dbus;
 767 #ifdef HAVE_DBUS
 768   struct watch *watches;
 769 #endif
 770
 771   /* TFTP stuff */
 772   struct tftp_transfer *tftp_trans;
 773
 774   /* utility string buffer, hold max sized IP address as string */
 775   char *addrbuff;
 776
 777 } *daemon;
 778
 779 /* cache.c */
 780 void cache_init(void);
 781 void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
 782 char *record_source(int index);
 783 void querystr(char *str, unsigned short type);
 784 struct crec *cache_find_by_addr(struct crec *crecp,
 785                                 struct all_addr *addr, time_t now,
 786                                 unsigned short prot);
 787 struct crec *cache_find_by_name(struct crec *crecp,
 788                                 char *name, time_t now, unsigned short  prot);
 789 void cache_end_insert(void);
 790 void cache_start_insert(void);
 791 struct crec *cache_insert(char *name, struct all_addr *addr,
 792                           time_t now, unsigned long ttl, unsigned short flags);
 793 void cache_reload(void);
 794 void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
 795 struct in_addr a_record_from_hosts(char *name, time_t now);
 796 void cache_unhash_dhcp(void);
 797 void dump_cache(time_t now);
 798 char *cache_get_name(struct crec *crecp);
 799 char *get_domain(struct in_addr addr);
 800 #ifdef HAVE_IPV6
 801 char *get_domain6(struct in6_addr *addr);
 802 #endif
 803
 804 /* rfc1035.c */
 805 unsigned int extract_request(struct dns_header *header, size_t qlen,
 806                                char *name, unsigned short *typep);
 807 size_t setup_reply(struct dns_header *header, size_t  qlen,
 808                    struct all_addr *addrp, unsigned int flags,
 809                    unsigned long local_ttl);
 810 int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff,
 811                       time_t now, int is_sign, int checkrebind, int checking_disabled);
 812 size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 813                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 814 int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
 815                              struct bogus_addr *addr, time_t now);
 816 unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
 817                                  size_t *len, unsigned char **p, int *is_sign);
 818 int check_for_local_domain(char *name, time_t now);
 819 unsigned int questions_crc(struct dns_header *header, size_t plen, char *buff);
 820 size_t resize_packet(struct dns_header *header, size_t plen,
 821                   unsigned char *pheader, size_t hlen);
 822 size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
 823
 824 /* util.c */
 825 void rand_init(void);
 826 unsigned short rand16(void);
 827 int legal_hostname(char *c);
 828 char *canonicalise(char *s, int *nomem);
 829 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 830 void *safe_malloc(size_t size);
 831 void safe_pipe(int *fd, int read_noblock);
 832 void *whine_malloc(size_t size);
 833 int sa_len(union mysockaddr *addr);
 834 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 835 int hostname_isequal(char *a, char *b);
 836 time_t dnsmasq_time(void);
 837 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 838 #ifdef HAVE_IPV6
 839 int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
 840 u64 addr6part(struct in6_addr *addr);
 841 void setaddr6part(struct in6_addr *addr, u64 host);
 842 #endif
 843 int retry_send(void);
 844 void prettyprint_time(char *buf, unsigned int t);
 845 int prettyprint_addr(union mysockaddr *addr, char *buf);
 846 int parse_hex(char *in, unsigned char *out, int maxlen,
 847               unsigned int *wildcard_mask, int *mac_type);
 848 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 849                   unsigned int mask);
 850 int expand_buf(struct iovec *iov, size_t size);
 851 char *print_mac(char *buff, unsigned char *mac, int len);
 852 void bump_maxfd(int fd, int *max);
 853 int read_write(int fd, unsigned char *packet, int size, int rw);
 854
 855 /* log.c */
 856 void die(char *message, char *arg1, int exit_code);
 857 int log_start(struct passwd *ent_pw, int errfd);
 858 int log_reopen(char *log_file);
 859 void my_syslog(int priority, const char *format, ...);
 860 void set_log_writer(fd_set *set, int *maxfdp);
 861 void check_log_writer(fd_set *set);
 862 void flush_log(void);
 863
 864 /* option.c */
 865 void read_opts (int argc, char **argv, char *compile_opts);
 866 char *option_string(int prot, unsigned int opt, unsigned char *val,
 867                     int opt_len, char *buf, int buf_len);
 868 void reread_dhcp(void);
 869 void set_option_bool(unsigned int opt);
 870 struct hostsfile *expand_filelist(struct hostsfile *list);
 871
 872 /* forward.c */
 873 void reply_query(int fd, int family, time_t now);
 874 void receive_query(struct listener *listen, time_t now);
 875 unsigned char *tcp_request(int confd, time_t now,
 876                            union mysockaddr *local_addr, struct in_addr netmask);
 877 void server_gone(struct server *server);
 878 struct frec *get_new_frec(time_t now, int *wait);
 879 void send_from(int fd, int nowild, char *packet, size_t len,
 880                union mysockaddr *to, struct all_addr *source,
 881                unsigned int iface);
 882
 883 /* network.c */
 884 int indextoname(int fd, int index, char *name);
 885 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 886 int random_sock(int family);
 887 void pre_allocate_sfds(void);
 888 int reload_servers(char *fname);
 889 void check_servers(void);
 890 int enumerate_interfaces();
 891 void create_wildcard_listeners(void);
 892 void create_bound_listeners(int die);
 893 int is_dad_listeners(void);
 894 int iface_check(int family, struct all_addr *addr, char *name);
 895 int fix_fd(int fd);
 896 struct in_addr get_ifaddr(char *intr);
 897 #ifdef HAVE_IPV6
 898 int set_ipv6pktinfo(int fd);
 899 #endif
 900
 901 /* dhcp.c */
 902 #ifdef HAVE_DHCP
 903 void dhcp_init(void);
 904 void dhcp_packet(time_t now, int pxe_fd);
 905 struct dhcp_context *address_available(struct dhcp_context *context,
 906                                        struct in_addr addr,
 907                                        struct dhcp_netid *netids);
 908 struct dhcp_context *narrow_context(struct dhcp_context *context,
 909                                     struct in_addr taddr,
 910                                     struct dhcp_netid *netids);
 911 int address_allocate(struct dhcp_context *context,
 912                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 913                      struct dhcp_netid *netids, time_t now);
 914 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 915 struct dhcp_config *find_config(struct dhcp_config *configs,
 916                                 struct dhcp_context *context,
 917                                 unsigned char *clid, int clid_len,
 918                                 unsigned char *hwaddr, int hw_len,
 919                                 int hw_type, char *hostname);
 920 void dhcp_read_ethers(void);
 921 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 922 char *host_from_dns(struct in_addr addr);
 923 #endif
 924
 925 /* lease.c */
 926 #ifdef HAVE_DHCP
 927 void lease_update_file(time_t now);
 928 void lease_update_dns();
 929 void lease_init(time_t now);
 930 struct dhcp_lease *lease4_allocate(struct in_addr addr);
 931 #ifdef HAVE_DHCP6
 932 struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
 933 struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
 934                                int lease_type, int iaid, struct in6_addr *addr);
 935 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
 936 u64 lease_find_max_addr6(struct dhcp_context *context);
 937 #endif
 938 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 939                       unsigned char *clid, int hw_len, int hw_type, int clid_len);
 940 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth, char *domain, char *config_domain);
 941 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
 942 void lease_set_interface(struct dhcp_lease *lease, int interface);
 943 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
 944                                         unsigned char *clid, int clid_len);
 945 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
 946 struct in_addr lease_find_max_addr(struct dhcp_context *context);
 947 void lease_prune(struct dhcp_lease *target, time_t now);
 948 void lease_update_from_configs(void);
 949 int do_script_run(time_t now);
 950 void rerun_scripts(void);
 951 #ifdef HAVE_SCRIPT
 952 void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
 953                          unsigned int len, int delim);
 954 #endif
 955 #endif
 956
 957 /* rfc2131.c */
 958 #ifdef HAVE_DHCP
 959 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 960                   size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd, struct in_addr fallback);
 961 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
 962                                int clid_len, unsigned char *clid, int *len_out);
 963 #endif
 964
 965 /* dnsmasq.c */
 966 #ifdef HAVE_DHCP
 967 int make_icmp_sock(void);
 968 int icmp_ping(struct in_addr addr);
 969 #endif
 970 void send_alarm(void);
 971 void send_event(int fd, int event, int data, char *msg);
 972 void clear_cache_and_reload(time_t now);
 973 void poll_resolv(int force, int do_reload, time_t now);
 974
 975 /* netlink.c */
 976 #ifdef HAVE_LINUX_NETWORK
 977 void netlink_init(void);
 978 void netlink_multicast(void);
 979 #endif
 980
 981 /* bpf.c */
 982 #ifdef HAVE_BSD_NETWORK
 983 void init_bpf(void);
 984 void send_via_bpf(struct dhcp_packet *mess, size_t len,
 985                   struct in_addr iface_addr, struct ifreq *ifr);
 986 #endif
 987
 988 /* bpf.c or netlink.c */
 989 int iface_enumerate(int family, void *parm, int (callback)());
 990
 991 /* dbus.c */
 992 #ifdef HAVE_DBUS
 993 char *dbus_init(void);
 994 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
 995 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
 996 #  ifdef HAVE_DHCP
 997 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
 998 #  endif
 999 #endif
1000
1001 /* helper.c */
1002 #if defined(HAVE_DHCP) && !defined(NO_FORK)
1003 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
1004 void helper_write(void);
1005 void queue_script(int action, struct dhcp_lease *lease,
1006                   char *hostname, time_t now);
1007 int helper_buf_empty(void);
1008 #endif
1009
1010 /* tftp.c */
1011 #ifdef HAVE_TFTP
1012 void tftp_request(struct listener *listen, time_t now);
1013 void check_tftp_listeners(fd_set *rset, time_t now);
1014 #endif
1015
1016 /* conntrack.c */
1017 #ifdef HAVE_CONNTRACK
1018 int get_incoming_mark(union mysockaddr *peer_addr, struct all_addr *local_addr,
1019                       int istcp, unsigned int *markp);
1020 #endif
1021
1022 /* dhcp6.c */
1023 #ifdef HAVE_DHCP6
1024 void dhcp6_init(void);
1025 void dhcp6_packet(time_t now);
1026 int address6_allocate(struct dhcp_context *context,  unsigned char *clid, int clid_len,
1027                       int serial, struct dhcp_netid *netids, struct in6_addr *ans);
1028 struct dhcp_context *address6_available(struct dhcp_context *context,
1029                                         struct in6_addr *taddr,
1030                                         struct dhcp_netid *netids);
1031 struct dhcp_context *narrow_context6(struct dhcp_context *context,
1032                                      struct in6_addr *taddr,
1033                                      struct dhcp_netid *netids);
1034 struct dhcp_config *find_config6(struct dhcp_config *configs,
1035                                  struct dhcp_context *context,
1036                                  unsigned char *duid, int duid_len,
1037                                  char *hostname);
1038 struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1039                                             int prefix, u64 addr);
1040 void make_duid(time_t now);
1041 #endif
1042
1043 /* rfc3315.c */
1044 #ifdef HAVE_DHCP6
1045 size_t dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1046                    struct in6_addr *fallback, size_t sz, int is_multicast, time_t now);
1047 #endif
1048
1049 /* dhcp-common.c */
1050 #ifdef HAVE_DHCP
1051 void dhcp_common_init(void);
1052 ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1053 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
1054 struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1055                                  struct dhcp_opt *opts);
1056 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
1057 char *strip_hostname(char *hostname);
1058 void log_tags(struct dhcp_netid *netid, u32 xid);
1059 int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1060 void dhcp_update_configs(struct dhcp_config *configs);
1061 void check_dhcp_hosts(int fatal);
1062 #  ifdef HAVE_DHCP6
1063 void join_multicast(void);
1064 #  endif
1065 #endif
1066
1067 /* outpacket.c */
1068 #ifdef HAVE_DHCP6
1069 void end_opt6(int container);
1070 int save_counter(int newval);
1071 void *expand(size_t headroom);
1072 int new_opt6(int opt);
1073 void *put_opt6(void *data, size_t len);
1074 void put_opt6_long(unsigned int val);
1075 void put_opt6_short(unsigned int val);
1076 void put_opt6_char(unsigned int val);
1077 void put_opt6_string(char *s);
1078 #endif
1079
1080 /* radv.c */
1081 #ifdef HAVE_DHCP6
1082 void ra_init(time_t now);
1083 void icmp6_packet(void);
1084 time_t periodic_ra(time_t now);
1085 void ra_start_unsolicted(time_t now);
1086 #endif