src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2011 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) 2000-2011 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 #  define _GNU_SOURCE
  28 #  include <features.h>
  29 #endif
  30
  31 /* Need these defined early */
  32 #if defined(__sun) || defined(__sun__)
  33 #  define _XPG4_2
  34 #  define __EXTENSIONS__
  35 #endif
  36
  37 /* get these before config.h  for IPv6 stuff... */
  38 #include <sys/types.h>
  39 #include <sys/socket.h>
  40 #include <netinet/in.h>
  41
  42 #ifdef __APPLE__
  43 #  include <nameser.h>
  44 #  include <arpa/nameser_compat.h>
  45 #else
  46 #  include <arpa/nameser.h>
  47 #endif
  48
  49 /* and this. */
  50 #include <getopt.h>
  51
  52 #include "config.h"
  53
  54 #define gettext_noop(S) (S)
  55 #ifndef LOCALEDIR
  56 #  define _(S) (S)
  57 #else
  58 #  include <libintl.h>
  59 #  include <locale.h>
  60 #  define _(S) gettext(S)
  61 #endif
  62
  63 #include <arpa/inet.h>
  64 #include <sys/stat.h>
  65 #include <sys/ioctl.h>
  66 #if defined(HAVE_SOLARIS_NETWORK)
  67 #  include <sys/sockio.h>
  68 #endif
  69 #include <sys/select.h>
  70 #include <sys/wait.h>
  71 #include <sys/time.h>
  72 #include <sys/un.h>
  73 #include <limits.h>
  74 #include <net/if.h>
  75 #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu)
  76 /* Some solaris net/if./h omit this. */
  77 #  define ifr_mtu  ifr_ifru.ifru_metric
  78 #endif
  79 #include <unistd.h>
  80 #include <stdio.h>
  81 #include <string.h>
  82 #include <stdlib.h>
  83 #include <fcntl.h>
  84 #include <ctype.h>
  85 #include <signal.h>
  86 #include <stddef.h>
  87 #include <time.h>
  88 #include <errno.h>
  89 #include <pwd.h>
  90 #include <grp.h>
  91 #include <stdarg.h>
  92 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun)
  93 #  include <netinet/if_ether.h>
  94 #else
  95 #  include <net/ethernet.h>
  96 #endif
  97 #include <net/if_arp.h>
  98 #include <netinet/in_systm.h>
  99 #include <netinet/ip.h>
 100 #include <netinet/ip_icmp.h>
 101 #include <sys/uio.h>
 102 #include <syslog.h>
 103 #include <dirent.h>
 104 #ifndef HAVE_LINUX_NETWORK
 105 #  include <net/if_dl.h>
 106 #endif
 107
 108 #if defined(HAVE_LINUX_NETWORK)
 109 #include <linux/capability.h>
 110 /* There doesn't seem to be a universally-available
 111    userpace header for these. */
 112 extern int capset(cap_user_header_t header, cap_user_data_t data);
 113 extern int capget(cap_user_header_t header, cap_user_data_t data);
 114 #define LINUX_CAPABILITY_VERSION_1  0x19980330
 115 #define LINUX_CAPABILITY_VERSION_2  0x20071026
 116 #define LINUX_CAPABILITY_VERSION_3  0x20080522
 117
 118 #include <sys/prctl.h>
 119 #elif defined(HAVE_SOLARIS_NETWORK)
 120 #include <priv.h>
 121 #endif
 122
 123 /* daemon is function in the C library.... */
 124 #define daemon dnsmasq_daemon
 125
 126 /* Async event queue */
 127 struct event_desc {
 128   int event, data;
 129 };
 130
 131 #define EVENT_RELOAD    1
 132 #define EVENT_DUMP      2
 133 #define EVENT_ALARM     3
 134 #define EVENT_TERM      4
 135 #define EVENT_CHILD     5
 136 #define EVENT_REOPEN    6
 137 #define EVENT_EXITED    7
 138 #define EVENT_KILLED    8
 139 #define EVENT_EXEC_ERR  9
 140 #define EVENT_PIPE_ERR  10
 141 #define EVENT_USER_ERR  11
 142 #define EVENT_CAP_ERR   12
 143 #define EVENT_PIDFILE   13
 144 #define EVENT_HUSER_ERR 14
 145 #define EVENT_GROUP_ERR 15
 146 #define EVENT_DIE       16
 147 #define EVENT_LOG_ERR   17
 148 #define EVENT_FORK_ERR  18
 149
 150 /* Exit codes. */
 151 #define EC_GOOD        0
 152 #define EC_BADCONF     1
 153 #define EC_BADNET      2
 154 #define EC_FILE        3
 155 #define EC_NOMEM       4
 156 #define EC_MISC        5
 157 #define EC_INIT_OFFSET 10
 158
 159 /* Min buffer size: we check after adding each record, so there must be
 160    memory for the largest packet, and the largest record so the
 161    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 162    This might be increased is EDNS packet size if greater than the minimum.
 163 */
 164 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 165
 166 /* Trust the compiler dead-code elimator.... */
 167 #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
 168
 169 #define OPT_BOGUSPRIV      0
 170 #define OPT_FILTER         1
 171 #define OPT_LOG            2
 172 #define OPT_SELFMX         3
 173 #define OPT_NO_HOSTS       4
 174 #define OPT_NO_POLL        5
 175 #define OPT_DEBUG          6
 176 #define OPT_ORDER          7
 177 #define OPT_NO_RESOLV      8
 178 #define OPT_EXPAND         9
 179 #define OPT_LOCALMX        10
 180 #define OPT_NO_NEG         11
 181 #define OPT_NODOTS_LOCAL   12
 182 #define OPT_NOWILD         13
 183 #define OPT_ETHERS         14
 184 #define OPT_RESOLV_DOMAIN  15
 185 #define OPT_NO_FORK        16
 186 #define OPT_AUTHORITATIVE  17
 187 #define OPT_LOCALISE       18
 188 #define OPT_DBUS           19
 189 #define OPT_DHCP_FQDN      20
 190 #define OPT_NO_PING        21
 191 #define OPT_LEASE_RO       22
 192 #define OPT_ALL_SERVERS    23
 193 #define OPT_RELOAD         24
 194 #define OPT_LOCAL_REBIND   25
 195 #define OPT_TFTP_SECURE    26
 196 #define OPT_TFTP_NOBLOCK   27
 197 #define OPT_LOG_OPTS       28
 198 #define OPT_TFTP_APREF     29
 199 #define OPT_NO_OVERRIDE    30
 200 #define OPT_NO_REBIND      31
 201 #define OPT_ADD_MAC        32
 202 #define OPT_DNSSEC         33
 203 #define OPT_LAST           34
 204
 205 /* extra flags for my_syslog, we use a couple of facilities since they are known
 206    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 207 #define MS_TFTP LOG_USER
 208 #define MS_DHCP LOG_DAEMON
 209
 210 struct all_addr {
 211   union {
 212     struct in_addr addr4;
 213 #ifdef HAVE_IPV6
 214     struct in6_addr addr6;
 215 #endif
 216   } addr;
 217 };
 218
 219 struct bogus_addr {
 220   struct in_addr addr;
 221   struct bogus_addr *next;
 222 };
 223
 224 /* dns doctor param */
 225 struct doctor {
 226   struct in_addr in, end, out, mask;
 227   struct doctor *next;
 228 };
 229
 230 struct mx_srv_record {
 231   char *name, *target;
 232   int issrv, srvport, priority, weight;
 233   unsigned int offset;
 234   struct mx_srv_record *next;
 235 };
 236
 237 struct naptr {
 238   char *name, *replace, *regexp, *services, *flags;
 239   unsigned int order, pref;
 240   struct naptr *next;
 241 };
 242
 243 struct txt_record {
 244   char *name;
 245   unsigned char *txt;
 246   unsigned short class, len;
 247   struct txt_record *next;
 248 };
 249
 250 struct ptr_record {
 251   char *name, *ptr;
 252   struct ptr_record *next;
 253 };
 254
 255 struct cname {
 256   char *alias, *target;
 257   struct cname *next;
 258 };
 259
 260 struct interface_name {
 261   char *name; /* domain name */
 262   char *intr; /* interface name */
 263   struct interface_name *next;
 264 };
 265
 266 union bigname {
 267   char name[MAXDNAME];
 268   union bigname *next; /* freelist */
 269 };
 270
 271 struct crec {
 272   struct crec *next, *prev, *hash_next;
 273   time_t ttd; /* time to die */
 274   int uid;
 275   union {
 276     struct all_addr addr;
 277     struct {
 278       struct crec *cache;
 279       int uid;
 280     } cname;
 281   } addr;
 282   unsigned short flags;
 283   union {
 284     char sname[SMALLDNAME];
 285     union bigname *bname;
 286     char *namep;
 287   } name;
 288 };
 289
 290 #define F_IMMORTAL  (1u<<0)
 291 #define F_NAMEP     (1u<<1)
 292 #define F_REVERSE   (1u<<2)
 293 #define F_FORWARD   (1u<<3)
 294 #define F_DHCP      (1u<<4)
 295 #define F_NEG       (1u<<5)
 296 #define F_HOSTS     (1u<<6)
 297 #define F_IPV4      (1u<<7)
 298 #define F_IPV6      (1u<<8)
 299 #define F_BIGNAME   (1u<<9)
 300 #define F_NXDOMAIN  (1u<<10)
 301 #define F_CNAME     (1u<<11)
 302 #define F_NOERR     (1u<<12)
 303 #define F_CONFIG    (1u<<13)
 304 /* below here are only valid as args to log_query: cache
 305    entries are limited to 16 bits */
 306 #define F_UPSTREAM  (1u<<16)
 307 #define F_RRNAME    (1u<<17)
 308 #define F_SERVER    (1u<<18)
 309 #define F_QUERY     (1u<<19)
 310 #define F_NSRR      (1u<<20)
 311
 312
 313 /* struct sockaddr is not large enough to hold any address,
 314    and specifically not big enough to hold an IPv6 address.
 315    Blech. Roll our own. */
 316 union mysockaddr {
 317   struct sockaddr sa;
 318   struct sockaddr_in in;
 319 #if defined(HAVE_IPV6)
 320   struct sockaddr_in6 in6;
 321 #endif
 322 };
 323
 324 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 325 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 326 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 327 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 328 #define SERV_HAS_SOURCE       16  /* source address defined */
 329 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 330 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 331 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 332 #define SERV_MARK            256  /* for mark-and-delete */
 333 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 334 #define SERV_COUNTED         512  /* workspace for log code */
 335 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 336 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 337
 338 struct serverfd {
 339   int fd;
 340   union mysockaddr source_addr;
 341   char interface[IF_NAMESIZE+1];
 342   struct serverfd *next;
 343 };
 344
 345 struct randfd {
 346   int fd;
 347   unsigned short refcount, family;
 348 };
 349
 350 struct server {
 351   union mysockaddr addr, source_addr;
 352   char interface[IF_NAMESIZE+1];
 353   struct serverfd *sfd;
 354   char *domain; /* set if this server only handles a domain. */
 355   int flags, tcpfd;
 356   unsigned int queries, failed_queries;
 357   struct server *next;
 358 };
 359
 360 struct irec {
 361   union mysockaddr addr;
 362   struct in_addr netmask; /* only valid for IPv4 */
 363   int tftp_ok, mtu;
 364   char *name;
 365   struct irec *next;
 366 };
 367
 368 struct listener {
 369   int fd, tcpfd, tftpfd, family;
 370   struct irec *iface; /* only valid for non-wildcard */
 371   struct listener *next;
 372 };
 373
 374 /* interface and address parms from command line. */
 375 struct iname {
 376   char *name;
 377   union mysockaddr addr;
 378   int isloop, used;
 379   struct iname *next;
 380 };
 381
 382 /* resolv-file parms from command-line */
 383 struct resolvc {
 384   struct resolvc *next;
 385   int is_default, logged;
 386   time_t mtime;
 387   char *name;
 388 };
 389
 390 /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile */
 391 #define AH_DIR      1
 392 #define AH_INACTIVE 2
 393 struct hostsfile {
 394   struct hostsfile *next;
 395   int flags;
 396   char *fname;
 397   int index; /* matches to cache entries for logging */
 398 };
 399
 400 #define FREC_NOREBIND           1
 401 #define FREC_CHECKING_DISABLED  2
 402
 403 struct frec {
 404   union mysockaddr source;
 405   struct all_addr dest;
 406   struct server *sentto; /* NULL means free */
 407   struct randfd *rfd4;
 408 #ifdef HAVE_IPV6
 409   struct randfd *rfd6;
 410 #endif
 411   unsigned int iface;
 412   unsigned short orig_id, new_id;
 413   int fd, forwardall, flags;
 414   unsigned int crc;
 415   time_t time;
 416   struct frec *next;
 417 };
 418
 419 /* actions in the daemon->helper RPC */
 420 #define ACTION_DEL           1
 421 #define ACTION_OLD_HOSTNAME  2
 422 #define ACTION_OLD           3
 423 #define ACTION_ADD           4
 424
 425 #define DHCP_CHADDR_MAX 16
 426
 427 struct dhcp_lease {
 428   int clid_len;          /* length of client identifier */
 429   unsigned char *clid;   /* clientid */
 430   char *hostname, *fqdn; /* name from client-hostname option or config */
 431   char *old_hostname;    /* hostname before it moved to another lease */
 432   char auth_name;        /* hostname came from config, not from client */
 433   char new;              /* newly created */
 434   char changed;          /* modified */
 435   char aux_changed;      /* CLID or expiry changed */
 436   time_t expires;        /* lease expiry */
 437 #ifdef HAVE_BROKEN_RTC
 438   unsigned int length;
 439 #endif
 440   int hwaddr_len, hwaddr_type;
 441   unsigned char hwaddr[DHCP_CHADDR_MAX];
 442   struct in_addr addr, override, giaddr;
 443   unsigned char *extradata;
 444   unsigned int extradata_len, extradata_size;
 445   int last_interface;
 446   struct dhcp_lease *next;
 447 };
 448
 449 struct dhcp_netid {
 450   char *net;
 451   struct dhcp_netid *next;
 452 };
 453
 454 struct dhcp_netid_list {
 455   struct dhcp_netid *list;
 456   struct dhcp_netid_list *next;
 457 };
 458
 459 struct tag_if {
 460   struct dhcp_netid_list *set;
 461   struct dhcp_netid *tag;
 462   struct tag_if *next;
 463 };
 464
 465 struct hwaddr_config {
 466   int hwaddr_len, hwaddr_type;
 467   unsigned char hwaddr[DHCP_CHADDR_MAX];
 468   unsigned int wildcard_mask;
 469   struct hwaddr_config *next;
 470 };
 471
 472 struct dhcp_config {
 473   unsigned int flags;
 474   int clid_len;          /* length of client identifier */
 475   unsigned char *clid;   /* clientid */
 476   char *hostname, *domain;
 477   struct dhcp_netid_list *netid;
 478   struct in_addr addr;
 479   time_t decline_time;
 480   unsigned int lease_time;
 481   struct hwaddr_config *hwaddr;
 482   struct dhcp_config *next;
 483 };
 484
 485 #define CONFIG_DISABLE           1
 486 #define CONFIG_CLID              2
 487 #define CONFIG_TIME              8
 488 #define CONFIG_NAME             16
 489 #define CONFIG_ADDR             32
 490 #define CONFIG_NOCLID          128
 491 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 492 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 493 #define CONFIG_DECLINED       1024    /* address declined by client */
 494 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 495
 496 struct dhcp_opt {
 497   int opt, len, flags;
 498   union {
 499     int encap;
 500     unsigned int wildcard_mask;
 501     unsigned char *vendor_class;
 502   } u;
 503   unsigned char *val;
 504   struct dhcp_netid *netid;
 505   struct dhcp_opt *next;
 506 };
 507
 508 #define DHOPT_ADDR               1
 509 #define DHOPT_STRING             2
 510 #define DHOPT_ENCAPSULATE        4
 511 #define DHOPT_ENCAP_MATCH        8
 512 #define DHOPT_FORCE             16
 513 #define DHOPT_BANK              32
 514 #define DHOPT_ENCAP_DONE        64
 515 #define DHOPT_MATCH            128
 516 #define DHOPT_VENDOR           256
 517 #define DHOPT_HEX              512
 518 #define DHOPT_VENDOR_MATCH    1024
 519 #define DHOPT_RFC3925         2048
 520
 521 struct dhcp_boot {
 522   char *file, *sname;
 523   struct in_addr next_server;
 524   struct dhcp_netid *netid;
 525   struct dhcp_boot *next;
 526 };
 527
 528 struct pxe_service {
 529   unsigned short CSA, type;
 530   char *menu, *basename;
 531   struct in_addr server;
 532   struct dhcp_netid *netid;
 533   struct pxe_service *next;
 534 };
 535
 536 #define MATCH_VENDOR     1
 537 #define MATCH_USER       2
 538 #define MATCH_CIRCUIT    3
 539 #define MATCH_REMOTE     4
 540 #define MATCH_SUBSCRIBER 5
 541
 542 /* vendorclass, userclass, remote-id or cicuit-id */
 543 struct dhcp_vendor {
 544   int len, match_type, option;
 545   char *data;
 546   struct dhcp_netid netid;
 547   struct dhcp_vendor *next;
 548 };
 549
 550 struct dhcp_mac {
 551   unsigned int mask;
 552   int hwaddr_len, hwaddr_type;
 553   unsigned char hwaddr[DHCP_CHADDR_MAX];
 554   struct dhcp_netid netid;
 555   struct dhcp_mac *next;
 556 };
 557
 558 struct dhcp_bridge {
 559   char iface[IF_NAMESIZE];
 560   struct dhcp_bridge *alias, *next;
 561 };
 562
 563 struct cond_domain {
 564   char *domain;
 565   struct in_addr start, end;
 566   struct cond_domain *next;
 567 };
 568
 569 struct dhcp_context {
 570   unsigned int lease_time, addr_epoch;
 571   struct in_addr netmask, broadcast;
 572   struct in_addr local, router;
 573   struct in_addr start, end; /* range of available addresses */
 574   int flags;
 575   char *interface;
 576   struct dhcp_netid netid, *filter;
 577   struct dhcp_context *next, *current;
 578 };
 579
 580 #define CONTEXT_STATIC    1
 581 #define CONTEXT_NETMASK   2
 582 #define CONTEXT_BRDCAST   4
 583 #define CONTEXT_PROXY     8
 584
 585
 586 typedef unsigned char u8;
 587 typedef unsigned short u16;
 588 typedef unsigned int u32;
 589
 590
 591 struct dhcp_packet {
 592   u8 op, htype, hlen, hops;
 593   u32 xid;
 594   u16 secs, flags;
 595   struct in_addr ciaddr, yiaddr, siaddr, giaddr;
 596   u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128];
 597   u8 options[312];
 598 };
 599
 600 struct ping_result {
 601   struct in_addr addr;
 602   time_t time;
 603   struct ping_result *next;
 604 };
 605
 606 struct tftp_file {
 607   int refcount, fd;
 608   off_t size;
 609   dev_t dev;
 610   ino_t inode;
 611   char filename[];
 612 };
 613
 614 struct tftp_transfer {
 615   int sockfd;
 616   time_t timeout;
 617   int backoff;
 618   unsigned int block, blocksize, expansion;
 619   off_t offset;
 620   union mysockaddr peer;
 621   char opt_blocksize, opt_transize, netascii, carrylf;
 622   struct tftp_file *file;
 623   struct tftp_transfer *next;
 624 };
 625
 626 struct addr_list {
 627   struct in_addr addr;
 628   struct addr_list *next;
 629 };
 630
 631 struct interface_list {
 632   char *interface;
 633   struct interface_list *next;
 634 };
 635
 636 struct tftp_prefix {
 637   char *interface;
 638   char *prefix;
 639   struct tftp_prefix *next;
 640 };
 641
 642
 643 extern struct daemon {
 644   /* datastuctures representing the command-line and
 645      config file arguments. All set (including defaults)
 646      in option.c */
 647
 648   unsigned int options, options2;
 649   struct resolvc default_resolv, *resolv_files;
 650   time_t last_resolv;
 651   struct mx_srv_record *mxnames;
 652   struct naptr *naptr;
 653   struct txt_record *txt;
 654   struct ptr_record *ptr;
 655   struct cname *cnames;
 656   struct interface_name *int_names;
 657   char *mxtarget;
 658   char *lease_file;
 659   char *username, *groupname, *scriptuser;
 660   int group_set, osport;
 661   char *domain_suffix;
 662   struct cond_domain *cond_domain;
 663   char *runfile;
 664   char *lease_change_command;
 665   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 666   struct bogus_addr *bogus_addr;
 667   struct server *servers;
 668   int log_fac; /* log facility */
 669   char *log_file; /* optional log file */
 670   int max_logs;  /* queue limit */
 671   int cachesize, ftabsize;
 672   int port, query_port, min_port;
 673   unsigned long local_ttl, neg_ttl, max_ttl;
 674   struct hostsfile *addn_hosts;
 675   struct dhcp_context *dhcp;
 676   struct dhcp_config *dhcp_conf;
 677   struct dhcp_opt *dhcp_opts, *dhcp_match;
 678   struct dhcp_vendor *dhcp_vendors;
 679   struct dhcp_mac *dhcp_macs;
 680   struct dhcp_boot *boot_config;
 681   struct pxe_service *pxe_services;
 682   struct tag_if *tag_if;
 683   struct addr_list *override_relays;
 684   int override;
 685   int enable_pxe;
 686   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 687   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 688   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
 689   int dhcp_max, tftp_max;
 690   int dhcp_server_port, dhcp_client_port;
 691   int start_tftp_port, end_tftp_port;
 692   unsigned int min_leasetime;
 693   struct doctor *doctors;
 694   unsigned short edns_pktsz;
 695   char *tftp_prefix;
 696   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 697   struct interface_list *tftp_interfaces; /* interfaces for limited TFTP service */
 698   int tftp_unlimited;
 699
 700   /* globally used stuff for DNS */
 701   char *packet; /* packet buffer */
 702   int packet_buff_sz; /* size of above */
 703   char *namebuff; /* MAXDNAME size buffer */
 704   unsigned int local_answer, queries_forwarded;
 705   struct frec *frec_list;
 706   struct serverfd *sfds;
 707   struct irec *interfaces;
 708   struct listener *listeners;
 709   struct server *last_server;
 710   time_t forwardtime;
 711   int forwardcount;
 712   struct server *srv_save; /* Used for resend on DoD */
 713   size_t packet_len;       /*      "        "        */
 714   struct randfd *rfd_save; /*      "        "        */
 715   pid_t tcp_pids[MAX_PROCS];
 716   struct randfd randomsocks[RANDOM_SOCKS];
 717   int v6pktinfo;
 718
 719   /* DHCP state */
 720   int dhcpfd, helperfd, pxefd;
 721 #if defined(HAVE_LINUX_NETWORK)
 722   int netlinkfd;
 723 #elif defined(HAVE_BSD_NETWORK)
 724   int dhcp_raw_fd, dhcp_icmp_fd;
 725 #endif
 726   struct iovec dhcp_packet;
 727   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
 728   struct ping_result *ping_results;
 729   FILE *lease_stream;
 730   struct dhcp_bridge *bridges;
 731
 732   /* DBus stuff */
 733   /* void * here to avoid depending on dbus headers outside dbus.c */
 734   void *dbus;
 735 #ifdef HAVE_DBUS
 736   struct watch *watches;
 737 #endif
 738
 739   /* TFTP stuff */
 740   struct tftp_transfer *tftp_trans;
 741
 742 } *daemon;
 743
 744 /* cache.c */
 745 void cache_init(void);
 746 void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
 747 char *record_source(int index);
 748 void querystr(char *str, unsigned short type);
 749 struct crec *cache_find_by_addr(struct crec *crecp,
 750                                 struct all_addr *addr, time_t now,
 751                                 unsigned short prot);
 752 struct crec *cache_find_by_name(struct crec *crecp,
 753                                 char *name, time_t now, unsigned short  prot);
 754 void cache_end_insert(void);
 755 void cache_start_insert(void);
 756 struct crec *cache_insert(char *name, struct all_addr *addr,
 757                           time_t now, unsigned long ttl, unsigned short flags);
 758 void cache_reload(void);
 759 void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd);
 760 void cache_unhash_dhcp(void);
 761 void dump_cache(time_t now);
 762 char *cache_get_name(struct crec *crecp);
 763 char *get_domain(struct in_addr addr);
 764
 765 /* rfc1035.c */
 766 unsigned int extract_request(HEADER *header, size_t qlen,
 767                                char *name, unsigned short *typep);
 768 size_t setup_reply(HEADER *header, size_t  qlen,
 769                    struct all_addr *addrp, unsigned int flags,
 770                    unsigned long local_ttl);
 771 int extract_addresses(HEADER *header, size_t qlen, char *namebuff,
 772                       time_t now, int is_sign, int checkrebind, int checking_disabled);
 773 size_t answer_request(HEADER *header, char *limit, size_t qlen,
 774                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 775 int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name,
 776                              struct bogus_addr *addr, time_t now);
 777 unsigned char *find_pseudoheader(HEADER *header, size_t plen,
 778                                  size_t *len, unsigned char **p, int *is_sign);
 779 int check_for_local_domain(char *name, time_t now);
 780 unsigned int questions_crc(HEADER *header, size_t plen, char *buff);
 781 size_t resize_packet(HEADER *header, size_t plen,
 782                   unsigned char *pheader, size_t hlen);
 783 size_t add_mac(HEADER *header, size_t plen, char *limit, union mysockaddr *l3);
 784
 785 /* util.c */
 786 void rand_init(void);
 787 unsigned short rand16(void);
 788 int legal_hostname(char *c);
 789 char *canonicalise(char *s, int *nomem);
 790 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 791 void *safe_malloc(size_t size);
 792 void safe_pipe(int *fd, int read_noblock);
 793 void *whine_malloc(size_t size);
 794 int sa_len(union mysockaddr *addr);
 795 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 796 int hostname_isequal(char *a, char *b);
 797 time_t dnsmasq_time(void);
 798 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 799 int retry_send(void);
 800 void prettyprint_time(char *buf, unsigned int t);
 801 int prettyprint_addr(union mysockaddr *addr, char *buf);
 802 int parse_hex(char *in, unsigned char *out, int maxlen,
 803               unsigned int *wildcard_mask, int *mac_type);
 804 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 805                   unsigned int mask);
 806 int expand_buf(struct iovec *iov, size_t size);
 807 char *print_mac(char *buff, unsigned char *mac, int len);
 808 void bump_maxfd(int fd, int *max);
 809 int read_write(int fd, unsigned char *packet, int size, int rw);
 810
 811 /* log.c */
 812 void die(char *message, char *arg1, int exit_code);
 813 int log_start(struct passwd *ent_pw, int errfd);
 814 int log_reopen(char *log_file);
 815 void my_syslog(int priority, const char *format, ...);
 816 void set_log_writer(fd_set *set, int *maxfdp);
 817 void check_log_writer(fd_set *set);
 818 void flush_log(void);
 819
 820 /* option.c */
 821 void read_opts (int argc, char **argv, char *compile_opts);
 822 char *option_string(unsigned char opt, int *is_ip, int *is_name);
 823 void reread_dhcp(void);
 824 void set_option_bool(unsigned int opt);
 825 struct hostsfile *expand_filelist(struct hostsfile *list);
 826
 827 /* forward.c */
 828 void reply_query(int fd, int family, time_t now);
 829 void receive_query(struct listener *listen, time_t now);
 830 unsigned char *tcp_request(int confd, time_t now,
 831                            struct in_addr local_addr, struct in_addr netmask);
 832 void server_gone(struct server *server);
 833 struct frec *get_new_frec(time_t now, int *wait);
 834
 835 /* network.c */
 836 int indextoname(int fd, int index, char *name);
 837 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 838 int random_sock(int family);
 839 void pre_allocate_sfds(void);
 840 int reload_servers(char *fname);
 841 void check_servers(void);
 842 int enumerate_interfaces();
 843 struct listener *create_wildcard_listeners(void);
 844 struct listener *create_bound_listeners(void);
 845 int iface_check(int family, struct all_addr *addr, char *name, int *indexp);
 846 int fix_fd(int fd);
 847 struct in_addr get_ifaddr(char *intr);
 848
 849 /* dhcp.c */
 850 #ifdef HAVE_DHCP
 851 void dhcp_init(void);
 852 void dhcp_packet(time_t now, int pxe_fd);
 853 struct dhcp_context *address_available(struct dhcp_context *context,
 854                                        struct in_addr addr,
 855                                        struct dhcp_netid *netids);
 856 struct dhcp_context *narrow_context(struct dhcp_context *context,
 857                                     struct in_addr taddr,
 858                                     struct dhcp_netid *netids);
 859 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
 860 int address_allocate(struct dhcp_context *context,
 861                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 862                      struct dhcp_netid *netids, time_t now);
 863 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
 864 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 865 struct dhcp_config *find_config(struct dhcp_config *configs,
 866                                 struct dhcp_context *context,
 867                                 unsigned char *clid, int clid_len,
 868                                 unsigned char *hwaddr, int hw_len,
 869                                 int hw_type, char *hostname);
 870 void dhcp_update_configs(struct dhcp_config *configs);
 871 void dhcp_read_ethers(void);
 872 void check_dhcp_hosts(int fatal);
 873 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 874 char *strip_hostname(char *hostname);
 875 char *host_from_dns(struct in_addr addr);
 876 char *get_domain(struct in_addr addr);
 877 #endif
 878
 879 /* lease.c */
 880 #ifdef HAVE_DHCP
 881 void lease_update_file(time_t now);
 882 void lease_update_dns();
 883 void lease_init(time_t now);
 884 struct dhcp_lease *lease_allocate(struct in_addr addr);
 885 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 886                       unsigned char *clid, int hw_len, int hw_type, int clid_len);
 887 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth);
 888 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
 889 void lease_set_interface(struct dhcp_lease *lease, int interface);
 890 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
 891                                         unsigned char *clid, int clid_len);
 892 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
 893 void lease_prune(struct dhcp_lease *target, time_t now);
 894 void lease_update_from_configs(void);
 895 int do_script_run(time_t now);
 896 void rerun_scripts(void);
 897 #endif
 898
 899 /* rfc2131.c */
 900 #ifdef HAVE_DHCP
 901 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 902                   size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd);
 903 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
 904                                int clid_len, unsigned char *clid, int *len_out);
 905 #endif
 906
 907 /* dnsmasq.c */
 908 #ifdef HAVE_DHCP
 909 int make_icmp_sock(void);
 910 int icmp_ping(struct in_addr addr);
 911 #endif
 912 void send_event(int fd, int event, int data);
 913 void clear_cache_and_reload(time_t now);
 914 void poll_resolv(int force, int do_reload, time_t now);
 915
 916 /* netlink.c */
 917 #ifdef HAVE_LINUX_NETWORK
 918 void netlink_init(void);
 919 void netlink_multicast(void);
 920 #endif
 921
 922 /* bpf.c */
 923 #ifdef HAVE_BSD_NETWORK
 924 void init_bpf(void);
 925 void send_via_bpf(struct dhcp_packet *mess, size_t len,
 926                   struct in_addr iface_addr, struct ifreq *ifr);
 927 #endif
 928
 929 /* bpf.c or netlink.c */
 930 int iface_enumerate(int family, void *parm, int (callback)());
 931
 932 /* dbus.c */
 933 #ifdef HAVE_DBUS
 934 char *dbus_init(void);
 935 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
 936 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
 937 #  ifdef HAVE_DHCP
 938 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
 939 #  endif
 940 #endif
 941
 942 /* helper.c */
 943 #if defined(HAVE_DHCP) && !defined(NO_FORK)
 944 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
 945 void helper_write(void);
 946 void queue_script(int action, struct dhcp_lease *lease,
 947                   char *hostname, time_t now);
 948 int helper_buf_empty(void);
 949 #endif
 950
 951 /* tftp.c */
 952 #ifdef HAVE_TFTP
 953 void tftp_request(struct listener *listen, time_t now);
 954 void check_tftp_listeners(fd_set *rset, time_t now);
 955 #endif