release/src/router/dnsmasq/src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2010 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) 2000-2010 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 <linux/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 #define OPT_BOGUSPRIV      (1u<<0)
 167 #define OPT_FILTER         (1u<<1)
 168 #define OPT_LOG            (1u<<2)
 169 #define OPT_SELFMX         (1u<<3)
 170 #define OPT_NO_HOSTS       (1u<<4)
 171 #define OPT_NO_POLL        (1u<<5)
 172 #define OPT_DEBUG          (1u<<6)
 173 #define OPT_ORDER          (1u<<7)
 174 #define OPT_NO_RESOLV      (1u<<8)
 175 #define OPT_EXPAND         (1u<<9)
 176 #define OPT_LOCALMX        (1u<<10)
 177 #define OPT_NO_NEG         (1u<<11)
 178 #define OPT_NODOTS_LOCAL   (1u<<12)
 179 #define OPT_NOWILD         (1u<<13)
 180 #define OPT_ETHERS         (1u<<14)
 181 #define OPT_RESOLV_DOMAIN  (1u<<15)
 182 #define OPT_NO_FORK        (1u<<16)
 183 #define OPT_AUTHORITATIVE  (1u<<17)
 184 #define OPT_LOCALISE       (1u<<18)
 185 #define OPT_DBUS           (1u<<19)
 186 #define OPT_DHCP_FQDN      (1u<<20)
 187 #define OPT_NO_PING        (1u<<21)
 188 #define OPT_LEASE_RO       (1u<<22)
 189 #define OPT_ALL_SERVERS    (1u<<23)
 190 #define OPT_RELOAD         (1u<<24)
 191 #define OPT_LOCAL_REBIND   (1u<<25)
 192 #define OPT_TFTP_SECURE    (1u<<26)
 193 #define OPT_TFTP_NOBLOCK   (1u<<27)
 194 #define OPT_LOG_OPTS       (1u<<28)
 195 #define OPT_TFTP_APREF     (1u<<29)
 196 #define OPT_NO_OVERRIDE    (1u<<30)
 197 #define OPT_NO_REBIND      (1u<<31)
 198
 199 /* extra flags for my_syslog, we use a couple of facilities since they are known
 200    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 201 #define MS_TFTP LOG_USER
 202 #define MS_DHCP LOG_DAEMON
 203
 204 struct all_addr {
 205   union {
 206     struct in_addr addr4;
 207 #ifdef HAVE_IPV6
 208     struct in6_addr addr6;
 209 #endif
 210   } addr;
 211 };
 212
 213 struct bogus_addr {
 214   struct in_addr addr;
 215   struct bogus_addr *next;
 216 };
 217
 218 /* dns doctor param */
 219 struct doctor {
 220   struct in_addr in, end, out, mask;
 221   struct doctor *next;
 222 };
 223
 224 struct mx_srv_record {
 225   char *name, *target;
 226   int issrv, srvport, priority, weight;
 227   unsigned int offset;
 228   struct mx_srv_record *next;
 229 };
 230
 231 struct naptr {
 232   char *name, *replace, *regexp, *services, *flags;
 233   unsigned int order, pref;
 234   struct naptr *next;
 235 };
 236
 237 struct txt_record {
 238   char *name, *txt;
 239   unsigned short class, len;
 240   struct txt_record *next;
 241 };
 242
 243 struct ptr_record {
 244   char *name, *ptr;
 245   struct ptr_record *next;
 246 };
 247
 248 struct cname {
 249   char *alias, *target;
 250   struct cname *next;
 251 };
 252
 253 struct interface_name {
 254   char *name; /* domain name */
 255   char *intr; /* interface name */
 256   struct interface_name *next;
 257 };
 258
 259 union bigname {
 260   char name[MAXDNAME];
 261   union bigname *next; /* freelist */
 262 };
 263
 264 struct crec {
 265   struct crec *next, *prev, *hash_next;
 266   time_t ttd; /* time to die */
 267   int uid;
 268   union {
 269     struct all_addr addr;
 270     struct {
 271       struct crec *cache;
 272       int uid;
 273     } cname;
 274   } addr;
 275   unsigned short flags;
 276   union {
 277     char sname[SMALLDNAME];
 278     union bigname *bname;
 279     char *namep;
 280   } name;
 281 };
 282
 283 #define F_IMMORTAL  1
 284 #define F_CONFIG    2
 285 #define F_REVERSE   4
 286 #define F_FORWARD   8
 287 #define F_DHCP      16
 288 #define F_NEG       32
 289 #define F_HOSTS     64
 290 #define F_IPV4      128
 291 #define F_IPV6      256
 292 #define F_BIGNAME   512
 293 #define F_UPSTREAM  1024
 294 #define F_SERVER    2048
 295 #define F_NXDOMAIN  4096
 296 #define F_QUERY     8192
 297 #define F_CNAME     16384
 298 #define F_NOERR     32768
 299
 300 /* struct sockaddr is not large enough to hold any address,
 301    and specifically not big enough to hold an IPv6 address.
 302    Blech. Roll our own. */
 303 union mysockaddr {
 304   struct sockaddr sa;
 305   struct sockaddr_in in;
 306 #if defined(HAVE_IPV6)
 307   struct sockaddr_in6 in6;
 308 #endif
 309 };
 310
 311 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 312 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 313 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 314 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 315 #define SERV_HAS_SOURCE       16  /* source address defined */
 316 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 317 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 318 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 319 #define SERV_MARK            256  /* for mark-and-delete */
 320 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 321 #define SERV_COUNTED         512  /* workspace for log code */
 322 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 323 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 324
 325 struct serverfd {
 326   int fd;
 327   union mysockaddr source_addr;
 328   char interface[IF_NAMESIZE+1];
 329   struct serverfd *next;
 330 };
 331
 332 struct randfd {
 333   int fd;
 334   unsigned short refcount, family;
 335 };
 336
 337 struct server {
 338   union mysockaddr addr, source_addr;
 339   char interface[IF_NAMESIZE+1];
 340   struct serverfd *sfd;
 341   char *domain; /* set if this server only handles a domain. */
 342   int flags, tcpfd;
 343   unsigned int queries, failed_queries;
 344   struct server *next;
 345 };
 346
 347 struct irec {
 348   union mysockaddr addr;
 349   struct in_addr netmask; /* only valid for IPv4 */
 350   int tftp_ok, mtu;
 351   char *name;
 352   struct irec *next;
 353 };
 354
 355 struct listener {
 356   int fd, tcpfd, tftpfd, family;
 357   struct irec *iface; /* only valid for non-wildcard */
 358   struct listener *next;
 359 };
 360
 361 /* interface and address parms from command line. */
 362 struct iname {
 363   char *name;
 364   union mysockaddr addr;
 365   int isloop, used;
 366   struct iname *next;
 367 };
 368
 369 /* resolv-file parms from command-line */
 370 struct resolvc {
 371   struct resolvc *next;
 372   int is_default, logged;
 373   time_t mtime;
 374   char *name;
 375 };
 376
 377 /* adn-hosts parms from command-line */
 378 #define AH_DIR      1
 379 #define AH_INACTIVE 2
 380 struct hostsfile {
 381   struct hostsfile *next;
 382   int flags;
 383   char *fname;
 384   int index; /* matches to cache entries for logging */
 385 };
 386
 387 struct frec {
 388   union mysockaddr source;
 389   struct all_addr dest;
 390   struct server *sentto; /* NULL means free */
 391   struct randfd *rfd4;
 392 #ifdef HAVE_IPV6
 393   struct randfd *rfd6;
 394 #endif
 395   unsigned int iface;
 396   unsigned short orig_id, new_id;
 397   int fd, forwardall, norebind;
 398   unsigned int crc;
 399   time_t time;
 400   struct frec *next;
 401 };
 402
 403 /* actions in the daemon->helper RPC */
 404 #define ACTION_DEL           1
 405 #define ACTION_OLD_HOSTNAME  2
 406 #define ACTION_OLD           3
 407 #define ACTION_ADD           4
 408
 409 #define DHCP_CHADDR_MAX 16
 410
 411 struct dhcp_lease {
 412   int clid_len;          /* length of client identifier */
 413   unsigned char *clid;   /* clientid */
 414   char *hostname, *fqdn; /* name from client-hostname option or config */
 415   char *old_hostname;    /* hostname before it moved to another lease */
 416   char auth_name;        /* hostname came from config, not from client */
 417   char new;              /* newly created */
 418   char changed;          /* modified */
 419   char aux_changed;      /* CLID or expiry changed */
 420   time_t expires;        /* lease expiry */
 421 #ifdef HAVE_BROKEN_RTC
 422   unsigned int length;
 423 #endif
 424   int hwaddr_len, hwaddr_type;
 425   unsigned char hwaddr[DHCP_CHADDR_MAX];
 426   struct in_addr addr, override, giaddr;
 427   unsigned char *extradata;
 428   unsigned int extradata_len, extradata_size;
 429   int last_interface;
 430   struct dhcp_lease *next;
 431 };
 432
 433 struct dhcp_netid {
 434   char *net;
 435   struct dhcp_netid *next;
 436 };
 437
 438 struct dhcp_netid_list {
 439   struct dhcp_netid *list;
 440   struct dhcp_netid_list *next;
 441 };
 442
 443 struct tag_if {
 444   struct dhcp_netid_list *set;
 445   struct dhcp_netid *tag;
 446   struct tag_if *next;
 447 };
 448
 449 struct hwaddr_config {
 450   int hwaddr_len, hwaddr_type;
 451   unsigned char hwaddr[DHCP_CHADDR_MAX];
 452   unsigned int wildcard_mask;
 453   struct hwaddr_config *next;
 454 };
 455
 456 struct dhcp_config {
 457   unsigned int flags;
 458   int clid_len;          /* length of client identifier */
 459   unsigned char *clid;   /* clientid */
 460   char *hostname, *domain;
 461   struct dhcp_netid_list *netid;
 462   struct in_addr addr;
 463   time_t decline_time;
 464   unsigned int lease_time;
 465   struct hwaddr_config *hwaddr;
 466   struct dhcp_config *next;
 467 };
 468
 469 #define CONFIG_DISABLE           1
 470 #define CONFIG_CLID              2
 471 #define CONFIG_TIME              8
 472 #define CONFIG_NAME             16
 473 #define CONFIG_ADDR             32
 474 #define CONFIG_NOCLID          128
 475 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 476 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 477 #define CONFIG_DECLINED       1024    /* address declined by client */
 478 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 479
 480 struct dhcp_opt {
 481   int opt, len, flags;
 482   union {
 483     int encap;
 484     unsigned int wildcard_mask;
 485     unsigned char *vendor_class;
 486   } u;
 487   unsigned char *val;
 488   struct dhcp_netid *netid;
 489   struct dhcp_opt *next;
 490 };
 491
 492 #define DHOPT_ADDR               1
 493 #define DHOPT_STRING             2
 494 #define DHOPT_ENCAPSULATE        4
 495 #define DHOPT_ENCAP_MATCH        8
 496 #define DHOPT_FORCE             16
 497 #define DHOPT_BANK              32
 498 #define DHOPT_ENCAP_DONE        64
 499 #define DHOPT_MATCH            128
 500 #define DHOPT_VENDOR           256
 501 #define DHOPT_HEX              512
 502 #define DHOPT_VENDOR_MATCH    1024
 503 #define DHOPT_RFC3925         2048
 504
 505 struct dhcp_boot {
 506   char *file, *sname;
 507   struct in_addr next_server;
 508   struct dhcp_netid *netid;
 509   struct dhcp_boot *next;
 510 };
 511
 512 struct pxe_service {
 513   unsigned short CSA, type;
 514   char *menu, *basename;
 515   struct in_addr server;
 516   struct dhcp_netid *netid;
 517   struct pxe_service *next;
 518 };
 519
 520 #define MATCH_VENDOR     1
 521 #define MATCH_USER       2
 522 #define MATCH_CIRCUIT    3
 523 #define MATCH_REMOTE     4
 524 #define MATCH_SUBSCRIBER 5
 525
 526 /* vendorclass, userclass, remote-id or cicuit-id */
 527 struct dhcp_vendor {
 528   int len, match_type, option;
 529   char *data;
 530   struct dhcp_netid netid;
 531   struct dhcp_vendor *next;
 532 };
 533
 534 struct dhcp_mac {
 535   unsigned int mask;
 536   int hwaddr_len, hwaddr_type;
 537   unsigned char hwaddr[DHCP_CHADDR_MAX];
 538   struct dhcp_netid netid;
 539   struct dhcp_mac *next;
 540 };
 541
 542 struct dhcp_bridge {
 543   char iface[IF_NAMESIZE];
 544   struct dhcp_bridge *alias, *next;
 545 };
 546
 547 struct cond_domain {
 548   char *domain;
 549   struct in_addr start, end;
 550   struct cond_domain *next;
 551 };
 552
 553 struct dhcp_context {
 554   unsigned int lease_time, addr_epoch;
 555   struct in_addr netmask, broadcast;
 556   struct in_addr local, router;
 557   struct in_addr start, end; /* range of available addresses */
 558   int flags;
 559   char *interface;
 560   struct dhcp_netid netid, *filter;
 561   struct dhcp_context *next, *current;
 562 };
 563
 564 #define CONTEXT_STATIC    1
 565 #define CONTEXT_NETMASK   2
 566 #define CONTEXT_BRDCAST   4
 567 #define CONTEXT_PROXY     8
 568
 569
 570 typedef unsigned char u8;
 571 typedef unsigned short u16;
 572 typedef unsigned int u32;
 573
 574
 575 struct dhcp_packet {
 576   u8 op, htype, hlen, hops;
 577   u32 xid;
 578   u16 secs, flags;
 579   struct in_addr ciaddr, yiaddr, siaddr, giaddr;
 580   u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128];
 581   u8 options[312];
 582 };
 583
 584 struct ping_result {
 585   struct in_addr addr;
 586   time_t time;
 587   struct ping_result *next;
 588 };
 589
 590 struct tftp_file {
 591   int refcount, fd;
 592   off_t size;
 593   dev_t dev;
 594   ino_t inode;
 595   char filename[];
 596 };
 597
 598 struct tftp_transfer {
 599   int sockfd;
 600   time_t timeout;
 601   int backoff;
 602   unsigned int block, blocksize, expansion;
 603   off_t offset;
 604   struct sockaddr_in peer;
 605   char opt_blocksize, opt_transize, netascii, carrylf;
 606   struct tftp_file *file;
 607   struct tftp_transfer *next;
 608 };
 609
 610 struct addr_list {
 611   struct in_addr addr;
 612   struct addr_list *next;
 613 };
 614
 615 struct interface_list {
 616   char *interface;
 617   struct interface_list *next;
 618 };
 619
 620 struct tftp_prefix {
 621   char *interface;
 622   char *prefix;
 623   struct tftp_prefix *next;
 624 };
 625
 626
 627 extern struct daemon {
 628   /* datastuctures representing the command-line and
 629      config file arguments. All set (including defaults)
 630      in option.c */
 631
 632   unsigned int options;
 633   struct resolvc default_resolv, *resolv_files;
 634   time_t last_resolv;
 635   struct mx_srv_record *mxnames;
 636   struct naptr *naptr;
 637   struct txt_record *txt;
 638   struct ptr_record *ptr;
 639   struct cname *cnames;
 640   struct interface_name *int_names;
 641   char *mxtarget;
 642   char *lease_file;
 643   char *username, *groupname, *scriptuser;
 644   int group_set, osport;
 645   char *domain_suffix;
 646   struct cond_domain *cond_domain;
 647   char *runfile;
 648   char *lease_change_command;
 649   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 650   struct bogus_addr *bogus_addr;
 651   struct server *servers;
 652   int log_fac; /* log facility */
 653   char *log_file; /* optional log file */
 654   int max_logs;  /* queue limit */
 655   int cachesize, ftabsize;
 656   int port, query_port, min_port;
 657   unsigned long local_ttl, neg_ttl, max_ttl;
 658   struct hostsfile *addn_hosts;
 659   struct dhcp_context *dhcp;
 660   struct dhcp_config *dhcp_conf;
 661   struct dhcp_opt *dhcp_opts, *dhcp_match;
 662   struct dhcp_vendor *dhcp_vendors;
 663   struct dhcp_mac *dhcp_macs;
 664   struct dhcp_boot *boot_config;
 665   struct pxe_service *pxe_services;
 666   struct tag_if *tag_if;
 667   struct addr_list *override_relays;
 668   int override;
 669   int enable_pxe;
 670   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 671   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 672   char *dhcp_hosts_file, *dhcp_opts_file;
 673   int dhcp_max, tftp_max;
 674   int dhcp_server_port, dhcp_client_port;
 675   int start_tftp_port, end_tftp_port;
 676   unsigned int min_leasetime;
 677   struct doctor *doctors;
 678   unsigned short edns_pktsz;
 679   char *tftp_prefix;
 680   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 681   struct interface_list *tftp_interfaces; /* interfaces for limited TFTP service */
 682   int tftp_unlimited;
 683
 684   /* globally used stuff for DNS */
 685   char *packet; /* packet buffer */
 686   int packet_buff_sz; /* size of above */
 687   char *namebuff; /* MAXDNAME size buffer */
 688   unsigned int local_answer, queries_forwarded;
 689   struct frec *frec_list;
 690   struct serverfd *sfds;
 691   struct irec *interfaces;
 692   struct listener *listeners;
 693   struct server *last_server;
 694   time_t forwardtime;
 695   int forwardcount;
 696   struct server *srv_save; /* Used for resend on DoD */
 697   size_t packet_len;       /*      "        "        */
 698   struct randfd *rfd_save; /*      "        "        */
 699   pid_t tcp_pids[MAX_PROCS];
 700   struct randfd randomsocks[RANDOM_SOCKS];
 701   int v6pktinfo;
 702
 703   /* DHCP state */
 704   int dhcpfd, helperfd, pxefd;
 705 #if defined(HAVE_LINUX_NETWORK)
 706   int netlinkfd;
 707 #elif defined(HAVE_BSD_NETWORK)
 708   int dhcp_raw_fd, dhcp_icmp_fd;
 709 #endif
 710   struct iovec dhcp_packet;
 711   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
 712   struct ping_result *ping_results;
 713   FILE *lease_stream;
 714   struct dhcp_bridge *bridges;
 715
 716   /* DBus stuff */
 717   /* void * here to avoid depending on dbus headers outside dbus.c */
 718   void *dbus;
 719 #ifdef HAVE_DBUS
 720   struct watch *watches;
 721 #endif
 722
 723   /* TFTP stuff */
 724   struct tftp_transfer *tftp_trans;
 725
 726 } *daemon;
 727
 728 /* cache.c */
 729 void cache_init(void);
 730 void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg);
 731 char *record_source(int index);
 732 void querystr(char *str, unsigned short type);
 733 struct crec *cache_find_by_addr(struct crec *crecp,
 734                                 struct all_addr *addr, time_t now,
 735                                 unsigned short prot);
 736 struct crec *cache_find_by_name(struct crec *crecp,
 737                                 char *name, time_t now, unsigned short  prot);
 738 void cache_end_insert(void);
 739 void cache_start_insert(void);
 740 struct crec *cache_insert(char *name, struct all_addr *addr,
 741                           time_t now, unsigned long ttl, unsigned short flags);
 742 void cache_reload(void);
 743 void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd);
 744 void cache_unhash_dhcp(void);
 745 void dump_cache(time_t now);
 746 char *cache_get_name(struct crec *crecp);
 747 char *get_domain(struct in_addr addr);
 748
 749 /* rfc1035.c */
 750 unsigned short extract_request(HEADER *header, size_t qlen,
 751                                char *name, unsigned short *typep);
 752 size_t setup_reply(HEADER *header, size_t  qlen,
 753                    struct all_addr *addrp, unsigned short flags,
 754                    unsigned long local_ttl);
 755 int extract_addresses(HEADER *header, size_t qlen, char *namebuff,
 756                       time_t now, int is_sign, int checkrebind);
 757 size_t answer_request(HEADER *header, char *limit, size_t qlen,
 758                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 759 int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name,
 760                              struct bogus_addr *addr, time_t now);
 761 unsigned char *find_pseudoheader(HEADER *header, size_t plen,
 762                                  size_t *len, unsigned char **p, int *is_sign);
 763 int check_for_local_domain(char *name, time_t now);
 764 unsigned int questions_crc(HEADER *header, size_t plen, char *buff);
 765 size_t resize_packet(HEADER *header, size_t plen,
 766                   unsigned char *pheader, size_t hlen);
 767
 768 /* util.c */
 769 void rand_init(void);
 770 unsigned short rand16(void);
 771 int legal_hostname(char *c);
 772 char *canonicalise(char *s, int *nomem);
 773 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 774 void *safe_malloc(size_t size);
 775 void safe_pipe(int *fd, int read_noblock);
 776 void *whine_malloc(size_t size);
 777 int sa_len(union mysockaddr *addr);
 778 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 779 int hostname_isequal(char *a, char *b);
 780 time_t dnsmasq_time(void);
 781 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 782 int retry_send(void);
 783 void prettyprint_time(char *buf, unsigned int t);
 784 int prettyprint_addr(union mysockaddr *addr, char *buf);
 785 int parse_hex(char *in, unsigned char *out, int maxlen,
 786               unsigned int *wildcard_mask, int *mac_type);
 787 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 788                   unsigned int mask);
 789 int expand_buf(struct iovec *iov, size_t size);
 790 char *print_mac(char *buff, unsigned char *mac, int len);
 791 void bump_maxfd(int fd, int *max);
 792 int read_write(int fd, unsigned char *packet, int size, int rw);
 793
 794 /* log.c */
 795 void die(char *message, char *arg1, int exit_code);
 796 int log_start(struct passwd *ent_pw, int errfd);
 797 int log_reopen(char *log_file);
 798 void my_syslog(int priority, const char *format, ...);
 799 void set_log_writer(fd_set *set, int *maxfdp);
 800 void check_log_writer(fd_set *set);
 801 void flush_log(void);
 802
 803 /* option.c */
 804 void read_opts (int argc, char **argv, char *compile_opts);
 805 char *option_string(unsigned char opt, int *is_ip, int *is_name);
 806 void reread_dhcp(void);
 807
 808 /* forward.c */
 809 void reply_query(int fd, int family, time_t now);
 810 void receive_query(struct listener *listen, time_t now);
 811 unsigned char *tcp_request(int confd, time_t now,
 812                            struct in_addr local_addr, struct in_addr netmask);
 813 void server_gone(struct server *server);
 814 struct frec *get_new_frec(time_t now, int *wait);
 815
 816 /* network.c */
 817 int indextoname(int fd, int index, char *name);
 818 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 819 int random_sock(int family);
 820 void pre_allocate_sfds(void);
 821 int reload_servers(char *fname);
 822 void check_servers(void);
 823 int enumerate_interfaces();
 824 struct listener *create_wildcard_listeners(void);
 825 struct listener *create_bound_listeners(void);
 826 int iface_check(int family, struct all_addr *addr, char *name, int *indexp);
 827 int fix_fd(int fd);
 828 struct in_addr get_ifaddr(char *intr);
 829
 830 /* dhcp.c */
 831 #ifdef HAVE_DHCP
 832 void dhcp_init(void);
 833 void dhcp_packet(time_t now, int pxe_fd);
 834 struct dhcp_context *address_available(struct dhcp_context *context,
 835                                        struct in_addr addr,
 836                                        struct dhcp_netid *netids);
 837 struct dhcp_context *narrow_context(struct dhcp_context *context,
 838                                     struct in_addr taddr,
 839                                     struct dhcp_netid *netids);
 840 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
 841 int address_allocate(struct dhcp_context *context,
 842                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 843                      struct dhcp_netid *netids, time_t now);
 844 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
 845 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 846 struct dhcp_config *find_config(struct dhcp_config *configs,
 847                                 struct dhcp_context *context,
 848                                 unsigned char *clid, int clid_len,
 849                                 unsigned char *hwaddr, int hw_len,
 850                                 int hw_type, char *hostname);
 851 void dhcp_update_configs(struct dhcp_config *configs);
 852 void dhcp_read_ethers(void);
 853 void check_dhcp_hosts(int fatal);
 854 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 855 char *strip_hostname(char *hostname);
 856 char *host_from_dns(struct in_addr addr);
 857 char *get_domain(struct in_addr addr);
 858 #endif
 859
 860 /* lease.c */
 861 #ifdef HAVE_DHCP
 862 void lease_update_file(time_t now);
 863 void lease_update_dns();
 864 void lease_init(time_t now);
 865 struct dhcp_lease *lease_allocate(struct in_addr addr);
 866 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 867                       unsigned char *clid, int hw_len, int hw_type, int clid_len);
 868 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth);
 869 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
 870 void lease_set_interface(struct dhcp_lease *lease, int interface);
 871 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
 872                                         unsigned char *clid, int clid_len);
 873 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
 874 void lease_prune(struct dhcp_lease *target, time_t now);
 875 void lease_update_from_configs(void);
 876 int do_script_run(time_t now);
 877 void rerun_scripts(void);
 878 #endif
 879
 880 /* rfc2131.c */
 881 #ifdef HAVE_DHCP
 882 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 883                   size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd);
 884 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
 885                                int clid_len, unsigned char *clid, int *len_out);
 886 #endif
 887
 888 /* dnsmasq.c */
 889 #ifdef HAVE_DHCP
 890 int make_icmp_sock(void);
 891 int icmp_ping(struct in_addr addr);
 892 #endif
 893 void send_event(int fd, int event, int data);
 894 void clear_cache_and_reload(time_t now);
 895 void poll_resolv(int force, int do_reload, time_t now);
 896
 897 /* netlink.c */
 898 #ifdef HAVE_LINUX_NETWORK
 899 void netlink_init(void);
 900 void netlink_multicast(void);
 901 #endif
 902
 903 /* bpf.c */
 904 #ifdef HAVE_BSD_NETWORK
 905 void init_bpf(void);
 906 void send_via_bpf(struct dhcp_packet *mess, size_t len,
 907                   struct in_addr iface_addr, struct ifreq *ifr);
 908 #endif
 909
 910 /* bpf.c or netlink.c */
 911 int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)());
 912
 913 /* dbus.c */
 914 #ifdef HAVE_DBUS
 915 char *dbus_init(void);
 916 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
 917 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
 918 #  ifdef HAVE_DHCP
 919 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
 920 #  endif
 921 #endif
 922
 923 /* helper.c */
 924 #if defined(HAVE_DHCP) && !defined(NO_FORK)
 925 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
 926 void helper_write(void);
 927 void queue_script(int action, struct dhcp_lease *lease,
 928                   char *hostname, time_t now);
 929 int helper_buf_empty(void);
 930 #endif
 931
 932 /* tftp.c */
 933 #ifdef HAVE_TFTP
 934 void tftp_request(struct listener *listen, time_t now);
 935 void check_tftp_listeners(fd_set *rset, time_t now);
 936 #endif