dnsmasq.h revision ffd68729961f7383f2e35494a03ccdef20f86c98
1/* dnsmasq is Copyright (c) 2000-2009 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) 2000-2009 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. */ 26#ifdef __linux__ 27# define _GNU_SOURCE 28# include <features.h> 29#endif 30 31/* get these before config.h for IPv6 stuff... */ 32#include <sys/types.h> 33#include <sys/socket.h> 34#include <netinet/in.h> 35 36#ifdef __APPLE__ 37# include <nameser.h> 38# include <arpa/nameser_compat.h> 39#else 40# include <arpa/nameser.h> 41#endif 42 43/* and this. */ 44#include <getopt.h> 45 46#include "config.h" 47 48#define gettext_noop(S) (S) 49#ifndef LOCALEDIR 50# define _(S) (S) 51#else 52# include <libintl.h> 53# include <locale.h> 54# define _(S) gettext(S) 55#endif 56 57#include <arpa/inet.h> 58#include <sys/stat.h> 59#include <sys/ioctl.h> 60#if defined(HAVE_SOLARIS_NETWORK) 61#include <sys/sockio.h> 62#endif 63#include <sys/select.h> 64#include <sys/wait.h> 65#include <sys/time.h> 66#include <sys/un.h> 67#include <limits.h> 68#include <net/if.h> 69#include <unistd.h> 70#include <stdio.h> 71#include <string.h> 72#include <stdlib.h> 73#include <fcntl.h> 74#include <ctype.h> 75#include <signal.h> 76#include <stddef.h> 77#include <time.h> 78#include <errno.h> 79#include <pwd.h> 80#include <grp.h> 81#include <stdarg.h> 82#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) 83# include <netinet/if_ether.h> 84#else 85# include <net/ethernet.h> 86#endif 87#include <net/if_arp.h> 88#include <netinet/in_systm.h> 89#include <netinet/ip.h> 90#include <netinet/ip_icmp.h> 91#include <sys/uio.h> 92#include <syslog.h> 93#include <dirent.h> 94#ifndef HAVE_LINUX_NETWORK 95# include <net/if_dl.h> 96#endif 97 98#if defined(HAVE_LINUX_NETWORK) 99#include <linux/capability.h> 100/* There doesn't seem to be a universally-available 101 userpace header for these. */ 102extern int capset(cap_user_header_t header, cap_user_data_t data); 103extern int capget(cap_user_header_t header, cap_user_data_t data); 104#define LINUX_CAPABILITY_VERSION_1 0x19980330 105#define LINUX_CAPABILITY_VERSION_2 0x20071026 106#define LINUX_CAPABILITY_VERSION_3 0x20080522 107 108#include <sys/prctl.h> 109#elif defined(HAVE_SOLARIS_NETWORK) 110#include <priv.h> 111#endif 112 113/* daemon is function in the C library.... */ 114#define daemon dnsmasq_daemon 115 116/* Async event queue */ 117struct event_desc { 118 int event, data; 119}; 120 121#define EVENT_RELOAD 1 122#define EVENT_DUMP 2 123#define EVENT_ALARM 3 124#define EVENT_TERM 4 125#define EVENT_CHILD 5 126#define EVENT_REOPEN 6 127#define EVENT_EXITED 7 128#define EVENT_KILLED 8 129#define EVENT_EXEC_ERR 9 130#define EVENT_PIPE_ERR 10 131#define EVENT_USER_ERR 11 132#define EVENT_CAP_ERR 12 133#define EVENT_PIDFILE 13 134#define EVENT_HUSER_ERR 14 135#define EVENT_GROUP_ERR 15 136#define EVENT_DIE 16 137#define EVENT_LOG_ERR 17 138#define EVENT_FORK_ERR 18 139 140/* Exit codes. */ 141#define EC_GOOD 0 142#define EC_BADCONF 1 143#define EC_BADNET 2 144#define EC_FILE 3 145#define EC_NOMEM 4 146#define EC_MISC 5 147#define EC_INIT_OFFSET 10 148 149/* Min buffer size: we check after adding each record, so there must be 150 memory for the largest packet, and the largest record so the 151 min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000. 152 This might be increased is EDNS packet size if greater than the minimum. 153*/ 154#define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ 155 156#define OPT_BOGUSPRIV (1u<<0) 157#define OPT_FILTER (1u<<1) 158#define OPT_LOG (1u<<2) 159#define OPT_SELFMX (1u<<3) 160#define OPT_NO_HOSTS (1u<<4) 161#define OPT_NO_POLL (1u<<5) 162#define OPT_DEBUG (1u<<6) 163#define OPT_ORDER (1u<<7) 164#define OPT_NO_RESOLV (1u<<8) 165#define OPT_EXPAND (1u<<9) 166#define OPT_LOCALMX (1u<<10) 167#define OPT_NO_NEG (1u<<11) 168#define OPT_NODOTS_LOCAL (1u<<12) 169#define OPT_NOWILD (1u<<13) 170#define OPT_ETHERS (1u<<14) 171#define OPT_RESOLV_DOMAIN (1u<<15) 172#define OPT_NO_FORK (1u<<16) 173#define OPT_AUTHORITATIVE (1u<<17) 174#define OPT_LOCALISE (1u<<18) 175#define OPT_DBUS (1u<<19) 176#define OPT_DHCP_FQDN (1u<<20) 177#define OPT_NO_PING (1u<<21) 178#define OPT_LEASE_RO (1u<<22) 179#define OPT_ALL_SERVERS (1u<<23) 180#define OPT_RELOAD (1u<<24) 181#define OPT_TFTP (1u<<25) 182#define OPT_TFTP_SECURE (1u<<26) 183#define OPT_TFTP_NOBLOCK (1u<<27) 184#define OPT_LOG_OPTS (1u<<28) 185#define OPT_TFTP_APREF (1u<<29) 186#define OPT_NO_OVERRIDE (1u<<30) 187#define OPT_NO_REBIND (1u<<31) 188 189/* extra flags for my_syslog, we use a couple of facilities since they are known 190 not to occupy the same bits as priorities, no matter how syslog.h is set up. */ 191#define MS_TFTP LOG_USER 192#define MS_DHCP LOG_DAEMON 193 194struct all_addr { 195 union { 196 struct in_addr addr4; 197#ifdef HAVE_IPV6 198 struct in6_addr addr6; 199#endif 200 } addr; 201}; 202 203struct bogus_addr { 204 struct in_addr addr; 205 struct bogus_addr *next; 206}; 207 208/* dns doctor param */ 209struct doctor { 210 struct in_addr in, end, out, mask; 211 struct doctor *next; 212}; 213 214struct mx_srv_record { 215 char *name, *target; 216 int issrv, srvport, priority, weight; 217 unsigned int offset; 218 struct mx_srv_record *next; 219}; 220 221struct naptr { 222 char *name, *replace, *regexp, *services, *flags; 223 unsigned int order, pref; 224 struct naptr *next; 225}; 226 227struct txt_record { 228 char *name, *txt; 229 unsigned short class, len; 230 struct txt_record *next; 231}; 232 233struct ptr_record { 234 char *name, *ptr; 235 struct ptr_record *next; 236}; 237 238struct cname { 239 char *alias, *target; 240 struct cname *next; 241}; 242 243struct interface_name { 244 char *name; /* domain name */ 245 char *intr; /* interface name */ 246 struct interface_name *next; 247}; 248 249union bigname { 250 char name[MAXDNAME]; 251 union bigname *next; /* freelist */ 252}; 253 254struct crec { 255 struct crec *next, *prev, *hash_next; 256 time_t ttd; /* time to die */ 257 int uid; 258 union { 259 struct all_addr addr; 260 struct { 261 struct crec *cache; 262 int uid; 263 } cname; 264 } addr; 265 unsigned short flags; 266 union { 267 char sname[SMALLDNAME]; 268 union bigname *bname; 269 char *namep; 270 } name; 271}; 272 273#define F_IMMORTAL 1 274#define F_CONFIG 2 275#define F_REVERSE 4 276#define F_FORWARD 8 277#define F_DHCP 16 278#define F_NEG 32 279#define F_HOSTS 64 280#define F_IPV4 128 281#define F_IPV6 256 282#define F_BIGNAME 512 283#define F_UPSTREAM 1024 284#define F_SERVER 2048 285#define F_NXDOMAIN 4096 286#define F_QUERY 8192 287#define F_CNAME 16384 288#define F_NOERR 32768 289 290/* struct sockaddr is not large enough to hold any address, 291 and specifically not big enough to hold an IPv6 address. 292 Blech. Roll our own. */ 293union mysockaddr { 294 struct sockaddr sa; 295 struct sockaddr_in in; 296#if defined(HAVE_IPV6) 297 struct sockaddr_in6 in6; 298#endif 299}; 300 301#define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */ 302#define SERV_NO_ADDR 2 /* no server, this domain is local only */ 303#define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */ 304#define SERV_HAS_DOMAIN 8 /* server for one domain only */ 305#define SERV_HAS_SOURCE 16 /* source address defined */ 306#define SERV_FOR_NODOTS 32 /* server for names with no domain part only */ 307#define SERV_WARNED_RECURSIVE 64 /* avoid warning spam */ 308#define SERV_FROM_DBUS 128 /* 1 if source is DBus */ 309#define SERV_MARK 256 /* for mark-and-delete */ 310#define SERV_TYPE (SERV_HAS_DOMAIN | SERV_FOR_NODOTS) 311#define SERV_COUNTED 512 /* workspace for log code */ 312 313struct serverfd { 314 int fd; 315 union mysockaddr source_addr; 316 char interface[IF_NAMESIZE+1]; 317 struct serverfd *next; 318}; 319 320struct randfd { 321 int fd; 322 unsigned short refcount, family; 323}; 324 325struct server { 326 union mysockaddr addr, source_addr; 327 char interface[IF_NAMESIZE+1]; 328 struct serverfd *sfd; 329 char *domain; /* set if this server only handles a domain. */ 330 int flags, tcpfd; 331 unsigned int queries, failed_queries; 332 struct server *next; 333}; 334 335struct irec { 336 union mysockaddr addr; 337 struct in_addr netmask; /* only valid for IPv4 */ 338 int dhcp_ok, mtu; 339 struct irec *next; 340}; 341 342struct listener { 343 int fd, tcpfd, tftpfd, family; 344 struct irec *iface; /* only valid for non-wildcard */ 345 struct listener *next; 346}; 347 348/* interface and address parms from command line. */ 349struct iname { 350 char *name; 351 union mysockaddr addr; 352 int isloop, used; 353 struct iname *next; 354}; 355 356/* resolv-file parms from command-line */ 357struct resolvc { 358 struct resolvc *next; 359 int is_default, logged; 360 time_t mtime; 361 char *name; 362}; 363 364/* adn-hosts parms from command-line */ 365#define AH_DIR 1 366#define AH_INACTIVE 2 367struct hostsfile { 368 struct hostsfile *next; 369 int flags; 370 char *fname; 371 int index; /* matches to cache entries for logging */ 372}; 373 374struct frec { 375 union mysockaddr source; 376 struct all_addr dest; 377 struct server *sentto; /* NULL means free */ 378 struct randfd *rfd4; 379#ifdef HAVE_IPV6 380 struct randfd *rfd6; 381#endif 382 unsigned int iface; 383 unsigned short orig_id, new_id; 384 int fd, forwardall; 385 unsigned int crc; 386 time_t time; 387 struct frec *next; 388}; 389 390/* actions in the daemon->helper RPC */ 391#define ACTION_DEL 1 392#define ACTION_OLD_HOSTNAME 2 393#define ACTION_OLD 3 394#define ACTION_ADD 4 395 396#define DHCP_CHADDR_MAX 16 397 398struct dhcp_lease { 399 int clid_len; /* length of client identifier */ 400 unsigned char *clid; /* clientid */ 401 char *hostname, *fqdn; /* name from client-hostname option or config */ 402 char *old_hostname; /* hostname before it moved to another lease */ 403 char auth_name; /* hostname came from config, not from client */ 404 char new; /* newly created */ 405 char changed; /* modified */ 406 char aux_changed; /* CLID or expiry changed */ 407 time_t expires; /* lease expiry */ 408#ifdef HAVE_BROKEN_RTC 409 unsigned int length; 410#endif 411 int hwaddr_len, hwaddr_type; 412 unsigned char hwaddr[DHCP_CHADDR_MAX]; 413 struct in_addr addr, override, giaddr; 414 unsigned char *vendorclass, *userclass, *supplied_hostname; 415 unsigned int vendorclass_len, userclass_len, supplied_hostname_len; 416 int last_interface; 417 struct dhcp_lease *next; 418}; 419 420struct dhcp_netid { 421 char *net; 422 struct dhcp_netid *next; 423}; 424 425struct dhcp_netid_list { 426 struct dhcp_netid *list; 427 struct dhcp_netid_list *next; 428}; 429 430struct hwaddr_config { 431 int hwaddr_len, hwaddr_type; 432 unsigned char hwaddr[DHCP_CHADDR_MAX]; 433 unsigned int wildcard_mask; 434 struct hwaddr_config *next; 435}; 436 437struct dhcp_config { 438 unsigned int flags; 439 int clid_len; /* length of client identifier */ 440 unsigned char *clid; /* clientid */ 441 char *hostname, *domain; 442 struct dhcp_netid netid; 443 struct in_addr addr; 444 time_t decline_time; 445 unsigned int lease_time; 446 struct hwaddr_config *hwaddr; 447 struct dhcp_config *next; 448}; 449 450#define CONFIG_DISABLE 1 451#define CONFIG_CLID 2 452#define CONFIG_TIME 8 453#define CONFIG_NAME 16 454#define CONFIG_ADDR 32 455#define CONFIG_NETID 64 456#define CONFIG_NOCLID 128 457#define CONFIG_FROM_ETHERS 256 /* entry created by /etc/ethers */ 458#define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */ 459#define CONFIG_DECLINED 1024 /* address declined by client */ 460#define CONFIG_BANK 2048 /* from dhcp hosts file */ 461 462struct dhcp_opt { 463 int opt, len, flags; 464 union { 465 int encap; 466 unsigned int wildcard_mask; 467 unsigned char *vendor_class; 468 } u; 469 unsigned char *val; 470 struct dhcp_netid *netid; 471 struct dhcp_opt *next; 472}; 473 474#define DHOPT_ADDR 1 475#define DHOPT_STRING 2 476#define DHOPT_ENCAPSULATE 4 477#define DHOPT_ENCAP_MATCH 8 478#define DHOPT_FORCE 16 479#define DHOPT_BANK 32 480#define DHOPT_ENCAP_DONE 64 481#define DHOPT_MATCH 128 482#define DHOPT_VENDOR 256 483#define DHOPT_HEX 512 484#define DHOPT_VENDOR_MATCH 1024 485 486struct dhcp_boot { 487 char *file, *sname; 488 struct in_addr next_server; 489 struct dhcp_netid *netid; 490 struct dhcp_boot *next; 491}; 492 493struct pxe_service { 494 unsigned short CSA, type; 495 char *menu, *basename; 496 struct in_addr server; 497 struct dhcp_netid *netid; 498 struct pxe_service *next; 499}; 500 501#define MATCH_VENDOR 1 502#define MATCH_USER 2 503#define MATCH_CIRCUIT 3 504#define MATCH_REMOTE 4 505#define MATCH_SUBSCRIBER 5 506 507/* vendorclass, userclass, remote-id or cicuit-id */ 508struct dhcp_vendor { 509 int len, match_type, option; 510 char *data; 511 struct dhcp_netid netid; 512 struct dhcp_vendor *next; 513}; 514 515struct dhcp_mac { 516 unsigned int mask; 517 int hwaddr_len, hwaddr_type; 518 unsigned char hwaddr[DHCP_CHADDR_MAX]; 519 struct dhcp_netid netid; 520 struct dhcp_mac *next; 521}; 522 523struct dhcp_bridge { 524 char iface[IF_NAMESIZE]; 525 struct dhcp_bridge *alias, *next; 526}; 527 528struct cond_domain { 529 char *domain; 530 struct in_addr start, end; 531 struct cond_domain *next; 532}; 533 534struct dhcp_context { 535 unsigned int lease_time, addr_epoch; 536 struct in_addr netmask, broadcast; 537 struct in_addr local, router; 538 struct in_addr start, end; /* range of available addresses */ 539 int flags; 540 struct dhcp_netid netid, *filter; 541 struct dhcp_context *next, *current; 542}; 543 544#define CONTEXT_STATIC 1 545#define CONTEXT_NETMASK 2 546#define CONTEXT_BRDCAST 4 547#define CONTEXT_PROXY 8 548 549 550typedef unsigned char u8; 551typedef unsigned short u16; 552typedef unsigned int u32; 553 554 555struct dhcp_packet { 556 u8 op, htype, hlen, hops; 557 u32 xid; 558 u16 secs, flags; 559 struct in_addr ciaddr, yiaddr, siaddr, giaddr; 560 u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128]; 561 u8 options[312]; 562}; 563 564struct ping_result { 565 struct in_addr addr; 566 time_t time; 567 struct ping_result *next; 568}; 569 570struct tftp_file { 571 int refcount, fd; 572 off_t size; 573 dev_t dev; 574 ino_t inode; 575 char filename[]; 576}; 577 578struct tftp_transfer { 579 int sockfd; 580 time_t timeout; 581 int backoff; 582 unsigned int block, blocksize, expansion; 583 off_t offset; 584 struct sockaddr_in peer; 585 char opt_blocksize, opt_transize, netascii, carrylf; 586 struct tftp_file *file; 587 struct tftp_transfer *next; 588}; 589 590extern struct daemon { 591 /* datastuctures representing the command-line and 592 config file arguments. All set (including defaults) 593 in option.c */ 594 595 unsigned int options; 596 struct resolvc default_resolv, *resolv_files; 597 time_t last_resolv; 598 struct mx_srv_record *mxnames; 599 struct naptr *naptr; 600 struct txt_record *txt; 601 struct ptr_record *ptr; 602 struct cname *cnames; 603 struct interface_name *int_names; 604 char *mxtarget; 605 char *lease_file; 606 char *username, *groupname, *scriptuser; 607 int group_set, osport; 608 char *domain_suffix; 609 struct cond_domain *cond_domain; 610 char *runfile; 611 char *lease_change_command; 612 struct iname *if_names, *if_addrs, *if_except, *dhcp_except; 613 struct bogus_addr *bogus_addr; 614 struct server *servers; 615 int log_fac; /* log facility */ 616 char *log_file; /* optional log file */ 617 int max_logs; /* queue limit */ 618 int cachesize, ftabsize; 619 int port, query_port, min_port; 620 unsigned long local_ttl, neg_ttl; 621 struct hostsfile *addn_hosts; 622 struct dhcp_context *dhcp; 623 struct dhcp_config *dhcp_conf; 624 struct dhcp_opt *dhcp_opts, *dhcp_match; 625 struct dhcp_vendor *dhcp_vendors; 626 struct dhcp_mac *dhcp_macs; 627 struct dhcp_boot *boot_config; 628 struct pxe_service *pxe_services; 629 int enable_pxe; 630 struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic; 631 char *dhcp_hosts_file, *dhcp_opts_file; 632 int dhcp_max, tftp_max; 633 int dhcp_server_port, dhcp_client_port; 634 int start_tftp_port, end_tftp_port; 635 unsigned int min_leasetime; 636 struct doctor *doctors; 637 unsigned short edns_pktsz; 638 char *tftp_prefix; 639 640 /* globally used stuff for DNS */ 641 char *packet; /* packet buffer */ 642 int packet_buff_sz; /* size of above */ 643 char *namebuff; /* MAXDNAME size buffer */ 644 unsigned int local_answer, queries_forwarded; 645 struct frec *frec_list; 646 struct serverfd *sfds; 647 struct irec *interfaces; 648 struct listener *listeners; 649 struct server *last_server; 650 time_t forwardtime; 651 int forwardcount; 652 struct server *srv_save; /* Used for resend on DoD */ 653 size_t packet_len; /* " " */ 654 struct randfd *rfd_save; /* " " */ 655 pid_t tcp_pids[MAX_PROCS]; 656 struct randfd randomsocks[RANDOM_SOCKS]; 657 658 /* DHCP state */ 659 int dhcpfd, helperfd; 660#if defined(HAVE_LINUX_NETWORK) 661 int netlinkfd; 662#elif defined(HAVE_BSD_NETWORK) 663 int dhcp_raw_fd, dhcp_icmp_fd; 664#endif 665 struct iovec dhcp_packet; 666 char *dhcp_buff, *dhcp_buff2; 667 struct ping_result *ping_results; 668 FILE *lease_stream; 669 struct dhcp_bridge *bridges; 670 671 /* DBus stuff */ 672 /* void * here to avoid depending on dbus headers outside dbus.c */ 673 void *dbus; 674#ifdef HAVE_DBUS 675 struct watch *watches; 676#endif 677 678 /* TFTP stuff */ 679 struct tftp_transfer *tftp_trans; 680 681} *daemon; 682 683/* cache.c */ 684void cache_init(void); 685void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg); 686char *record_source(int index); 687void querystr(char *str, unsigned short type); 688struct crec *cache_find_by_addr(struct crec *crecp, 689 struct all_addr *addr, time_t now, 690 unsigned short prot); 691struct crec *cache_find_by_name(struct crec *crecp, 692 char *name, time_t now, unsigned short prot); 693void cache_end_insert(void); 694void cache_start_insert(void); 695struct crec *cache_insert(char *name, struct all_addr *addr, 696 time_t now, unsigned long ttl, unsigned short flags); 697void cache_reload(void); 698void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd); 699void cache_unhash_dhcp(void); 700void dump_cache(time_t now); 701char *cache_get_name(struct crec *crecp); 702char *get_domain(struct in_addr addr); 703 704/* rfc1035.c */ 705unsigned short extract_request(HEADER *header, size_t qlen, 706 char *name, unsigned short *typep); 707size_t setup_reply(HEADER *header, size_t qlen, 708 struct all_addr *addrp, unsigned short flags, 709 unsigned long local_ttl); 710int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now); 711size_t answer_request(HEADER *header, char *limit, size_t qlen, 712 struct in_addr local_addr, struct in_addr local_netmask, time_t now); 713int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name, 714 struct bogus_addr *addr, time_t now); 715unsigned char *find_pseudoheader(HEADER *header, size_t plen, 716 size_t *len, unsigned char **p, int *is_sign); 717int check_for_local_domain(char *name, time_t now); 718unsigned int questions_crc(HEADER *header, size_t plen, char *buff); 719size_t resize_packet(HEADER *header, size_t plen, 720 unsigned char *pheader, size_t hlen); 721 722/* util.c */ 723void rand_init(void); 724unsigned short rand16(void); 725int legal_hostname(char *c); 726char *canonicalise(char *s, int *nomem); 727unsigned char *do_rfc1035_name(unsigned char *p, char *sval); 728void *safe_malloc(size_t size); 729void safe_pipe(int *fd, int read_noblock); 730void *whine_malloc(size_t size); 731int sa_len(union mysockaddr *addr); 732int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2); 733int hostname_isequal(char *a, char *b); 734time_t dnsmasq_time(void); 735int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask); 736int retry_send(void); 737void prettyprint_time(char *buf, unsigned int t); 738int prettyprint_addr(union mysockaddr *addr, char *buf); 739int parse_hex(char *in, unsigned char *out, int maxlen, 740 unsigned int *wildcard_mask, int *mac_type); 741int memcmp_masked(unsigned char *a, unsigned char *b, int len, 742 unsigned int mask); 743int expand_buf(struct iovec *iov, size_t size); 744char *print_mac(char *buff, unsigned char *mac, int len); 745void bump_maxfd(int fd, int *max); 746int read_write(int fd, unsigned char *packet, int size, int rw); 747 748/* log.c */ 749void die(char *message, char *arg1, int exit_code); 750int log_start(struct passwd *ent_pw, int errfd); 751int log_reopen(char *log_file); 752void my_syslog(int priority, const char *format, ...); 753void set_log_writer(fd_set *set, int *maxfdp); 754void check_log_writer(fd_set *set); 755void flush_log(void); 756 757/* option.c */ 758void read_opts (int argc, char **argv, char *compile_opts); 759char *option_string(unsigned char opt, int *is_ip, int *is_name); 760void reread_dhcp(void); 761 762/* forward.c */ 763void reply_query(int fd, int family, time_t now); 764void receive_query(struct listener *listen, time_t now); 765unsigned char *tcp_request(int confd, time_t now, 766 struct in_addr local_addr, struct in_addr netmask); 767void server_gone(struct server *server); 768struct frec *get_new_frec(time_t now, int *wait); 769 770/* network.c */ 771int indextoname(int fd, int index, char *name); 772int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp); 773int random_sock(int family); 774void pre_allocate_sfds(void); 775int reload_servers(char *fname); 776void check_servers(void); 777int enumerate_interfaces(); 778struct listener *create_wildcard_listeners(void); 779struct listener *create_bound_listeners(void); 780int iface_check(int family, struct all_addr *addr, char *name, int *indexp); 781int fix_fd(int fd); 782struct in_addr get_ifaddr(char *intr); 783 784/* dhcp.c */ 785#ifdef HAVE_DHCP 786void dhcp_init(void); 787void dhcp_packet(time_t now); 788struct dhcp_context *address_available(struct dhcp_context *context, 789 struct in_addr addr, 790 struct dhcp_netid *netids); 791struct dhcp_context *narrow_context(struct dhcp_context *context, 792 struct in_addr taddr, 793 struct dhcp_netid *netids); 794int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context, 795 struct in_addr *addrp, unsigned char *hwaddr, int hw_len, 796 struct dhcp_netid *netids, time_t now); 797int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type); 798struct dhcp_config *find_config(struct dhcp_config *configs, 799 struct dhcp_context *context, 800 unsigned char *clid, int clid_len, 801 unsigned char *hwaddr, int hw_len, 802 int hw_type, char *hostname); 803void dhcp_update_configs(struct dhcp_config *configs); 804void dhcp_read_ethers(void); 805void check_dhcp_hosts(int fatal); 806struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr); 807char *strip_hostname(char *hostname); 808char *host_from_dns(struct in_addr addr); 809char *get_domain(struct in_addr addr); 810#endif 811 812/* lease.c */ 813#ifdef HAVE_DHCP 814void lease_update_file(time_t now); 815void lease_update_dns(); 816void lease_init(time_t now); 817struct dhcp_lease *lease_allocate(struct in_addr addr); 818void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr, 819 unsigned char *clid, int hw_len, int hw_type, int clid_len); 820void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth); 821void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now); 822void lease_set_interface(struct dhcp_lease *lease, int interface); 823struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type, 824 unsigned char *clid, int clid_len); 825struct dhcp_lease *lease_find_by_addr(struct in_addr addr); 826void lease_prune(struct dhcp_lease *target, time_t now); 827void lease_update_from_configs(void); 828int do_script_run(time_t now); 829void rerun_scripts(void); 830#endif 831 832/* rfc2131.c */ 833#ifdef HAVE_DHCP 834size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, 835 size_t sz, time_t now, int unicast_dest, int *is_inform); 836unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, 837 int clid_len, unsigned char *clid, int *len_out); 838#endif 839 840/* dnsmasq.c */ 841#ifdef HAVE_DHCP 842int make_icmp_sock(void); 843int icmp_ping(struct in_addr addr); 844#endif 845void send_event(int fd, int event, int data); 846void clear_cache_and_reload(time_t now); 847 848/* netlink.c */ 849#ifdef HAVE_LINUX_NETWORK 850void netlink_init(void); 851void netlink_multicast(void); 852#endif 853 854/* bpf.c */ 855#ifdef HAVE_BSD_NETWORK 856void init_bpf(void); 857void send_via_bpf(struct dhcp_packet *mess, size_t len, 858 struct in_addr iface_addr, struct ifreq *ifr); 859#endif 860 861/* bpf.c or netlink.c */ 862int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)()); 863 864/* dbus.c */ 865#ifdef HAVE_DBUS 866char *dbus_init(void); 867void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset); 868void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset); 869void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname); 870#endif 871 872/* helper.c */ 873#if defined(HAVE_DHCP) && !defined(NO_FORK) 874int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd); 875void helper_write(void); 876void queue_script(int action, struct dhcp_lease *lease, 877 char *hostname, time_t now); 878int helper_buf_empty(void); 879#endif 880 881/* tftp.c */ 882#ifdef HAVE_TFTP 883void tftp_request(struct listener *listen, time_t now); 884void check_tftp_listeners(fd_set *rset, time_t now); 885#endif 886