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 # ifndef __ANDROID__ 28 # define _GNU_SOURCE 29 # endif 30 # include <features.h> 31 #endif 32 33 /* get these before config.h for IPv6 stuff... */ 34 #include <sys/types.h> 35 #include <sys/socket.h> 36 #include <netinet/in.h> 37 38 #ifdef __APPLE__ 39 # include <nameser.h> 40 # include <arpa/nameser_compat.h> 41 #else 42 # ifdef __ANDROID__ 43 # include "nameser.h" 44 # else 45 # include <arpa/nameser.h> 46 # endif 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 #include <unistd.h> 76 #include <stdio.h> 77 #include <string.h> 78 #include <stdlib.h> 79 #include <fcntl.h> 80 #include <ctype.h> 81 #include <signal.h> 82 #include <stddef.h> 83 #include <time.h> 84 #include <errno.h> 85 #include <pwd.h> 86 #include <grp.h> 87 #include <stdarg.h> 88 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__) 89 # include <netinet/if_ether.h> 90 #else 91 # include <net/ethernet.h> 92 #endif 93 #include <net/if_arp.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/ip.h> 96 #include <netinet/ip_icmp.h> 97 #include <sys/uio.h> 98 #include <syslog.h> 99 #include <dirent.h> 100 #ifndef HAVE_LINUX_NETWORK 101 # include <net/if_dl.h> 102 #endif 103 104 #if defined(HAVE_LINUX_NETWORK) 105 #include <linux/capability.h> 106 /* There doesn't seem to be a universally-available 107 userpace header for these. */ 108 extern int capset(cap_user_header_t header, cap_user_data_t data); 109 extern int capget(cap_user_header_t header, cap_user_data_t data); 110 #define LINUX_CAPABILITY_VERSION_1 0x19980330 111 #define LINUX_CAPABILITY_VERSION_2 0x20071026 112 #define LINUX_CAPABILITY_VERSION_3 0x20080522 113 114 #include <sys/prctl.h> 115 #elif defined(HAVE_SOLARIS_NETWORK) 116 #include <priv.h> 117 #endif 118 119 /* daemon is function in the C library.... */ 120 #define daemon dnsmasq_daemon 121 122 /* Async event queue */ 123 struct event_desc { 124 int event, data; 125 }; 126 127 #define EVENT_RELOAD 1 128 #define EVENT_DUMP 2 129 #define EVENT_ALARM 3 130 #define EVENT_TERM 4 131 #define EVENT_CHILD 5 132 #define EVENT_REOPEN 6 133 #define EVENT_EXITED 7 134 #define EVENT_KILLED 8 135 #define EVENT_EXEC_ERR 9 136 #define EVENT_PIPE_ERR 10 137 #define EVENT_USER_ERR 11 138 #define EVENT_CAP_ERR 12 139 #define EVENT_PIDFILE 13 140 #define EVENT_HUSER_ERR 14 141 #define EVENT_GROUP_ERR 15 142 #define EVENT_DIE 16 143 #define EVENT_LOG_ERR 17 144 #define EVENT_FORK_ERR 18 145 146 /* Exit codes. */ 147 #define EC_GOOD 0 148 #define EC_BADCONF 1 149 #define EC_BADNET 2 150 #define EC_FILE 3 151 #define EC_NOMEM 4 152 #define EC_MISC 5 153 #define EC_INIT_OFFSET 10 154 155 /* Min buffer size: we check after adding each record, so there must be 156 memory for the largest packet, and the largest record so the 157 min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000. 158 This might be increased is EDNS packet size if greater than the minimum. 159 */ 160 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ 161 162 #define OPT_BOGUSPRIV (1u<<0) 163 #define OPT_FILTER (1u<<1) 164 #define OPT_LOG (1u<<2) 165 #define OPT_SELFMX (1u<<3) 166 #define OPT_NO_HOSTS (1u<<4) 167 #define OPT_NO_POLL (1u<<5) 168 #define OPT_DEBUG (1u<<6) 169 #define OPT_ORDER (1u<<7) 170 #define OPT_NO_RESOLV (1u<<8) 171 #define OPT_EXPAND (1u<<9) 172 #define OPT_LOCALMX (1u<<10) 173 #define OPT_NO_NEG (1u<<11) 174 #define OPT_NODOTS_LOCAL (1u<<12) 175 #define OPT_NOWILD (1u<<13) 176 #define OPT_ETHERS (1u<<14) 177 #define OPT_RESOLV_DOMAIN (1u<<15) 178 #define OPT_NO_FORK (1u<<16) 179 #define OPT_AUTHORITATIVE (1u<<17) 180 #define OPT_LOCALISE (1u<<18) 181 #define OPT_DBUS (1u<<19) 182 #define OPT_DHCP_FQDN (1u<<20) 183 #define OPT_NO_PING (1u<<21) 184 #define OPT_LEASE_RO (1u<<22) 185 #define OPT_ALL_SERVERS (1u<<23) 186 #define OPT_RELOAD (1u<<24) 187 #define OPT_TFTP (1u<<25) 188 #define OPT_TFTP_SECURE (1u<<26) 189 #define OPT_TFTP_NOBLOCK (1u<<27) 190 #define OPT_LOG_OPTS (1u<<28) 191 #define OPT_TFTP_APREF (1u<<29) 192 #define OPT_NO_OVERRIDE (1u<<30) 193 #define OPT_NO_REBIND (1u<<31) 194 195 /* extra flags for my_syslog, we use a couple of facilities since they are known 196 not to occupy the same bits as priorities, no matter how syslog.h is set up. */ 197 #define MS_TFTP LOG_USER 198 #define MS_DHCP LOG_DAEMON 199 200 struct all_addr { 201 union { 202 struct in_addr addr4; 203 #ifdef HAVE_IPV6 204 struct in6_addr addr6; 205 #endif 206 } addr; 207 }; 208 209 struct bogus_addr { 210 struct in_addr addr; 211 struct bogus_addr *next; 212 }; 213 214 /* dns doctor param */ 215 struct doctor { 216 struct in_addr in, end, out, mask; 217 struct doctor *next; 218 }; 219 220 struct mx_srv_record { 221 char *name, *target; 222 int issrv, srvport, priority, weight; 223 unsigned int offset; 224 struct mx_srv_record *next; 225 }; 226 227 struct naptr { 228 char *name, *replace, *regexp, *services, *flags; 229 unsigned int order, pref; 230 struct naptr *next; 231 }; 232 233 struct txt_record { 234 char *name, *txt; 235 unsigned short class, len; 236 struct txt_record *next; 237 }; 238 239 struct ptr_record { 240 char *name, *ptr; 241 struct ptr_record *next; 242 }; 243 244 struct cname { 245 char *alias, *target; 246 struct cname *next; 247 }; 248 249 struct interface_name { 250 char *name; /* domain name */ 251 char *intr; /* interface name */ 252 struct interface_name *next; 253 }; 254 255 union bigname { 256 char name[MAXDNAME]; 257 union bigname *next; /* freelist */ 258 }; 259 260 struct crec { 261 struct crec *next, *prev, *hash_next; 262 time_t ttd; /* time to die */ 263 int uid; 264 union { 265 struct all_addr addr; 266 struct { 267 struct crec *cache; 268 int uid; 269 } cname; 270 } addr; 271 unsigned short flags; 272 union { 273 char sname[SMALLDNAME]; 274 union bigname *bname; 275 char *namep; 276 } name; 277 }; 278 279 #define F_IMMORTAL 1 280 #define F_CONFIG 2 281 #define F_REVERSE 4 282 #define F_FORWARD 8 283 #define F_DHCP 16 284 #define F_NEG 32 285 #define F_HOSTS 64 286 #define F_IPV4 128 287 #define F_IPV6 256 288 #define F_BIGNAME 512 289 #define F_UPSTREAM 1024 290 #define F_SERVER 2048 291 #define F_NXDOMAIN 4096 292 #define F_QUERY 8192 293 #define F_CNAME 16384 294 #define F_NOERR 32768 295 296 /* struct sockaddr is not large enough to hold any address, 297 and specifically not big enough to hold an IPv6 address. 298 Blech. Roll our own. */ 299 union mysockaddr { 300 struct sockaddr sa; 301 struct sockaddr_in in; 302 #if defined(HAVE_IPV6) 303 struct sockaddr_in6 in6; 304 #endif 305 }; 306 307 #define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */ 308 #define SERV_NO_ADDR 2 /* no server, this domain is local only */ 309 #define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */ 310 #define SERV_HAS_DOMAIN 8 /* server for one domain only */ 311 #define SERV_HAS_SOURCE 16 /* source address defined */ 312 #define SERV_FOR_NODOTS 32 /* server for names with no domain part only */ 313 #define SERV_WARNED_RECURSIVE 64 /* avoid warning spam */ 314 #define SERV_FROM_DBUS 128 /* 1 if source is DBus */ 315 #define SERV_MARK 256 /* for mark-and-delete */ 316 #define SERV_TYPE (SERV_HAS_DOMAIN | SERV_FOR_NODOTS) 317 #define SERV_COUNTED 512 /* workspace for log code */ 318 319 struct serverfd { 320 int fd; 321 union mysockaddr source_addr; 322 char interface[IF_NAMESIZE+1]; 323 struct serverfd *next; 324 uint32_t mark; 325 }; 326 327 struct randfd { 328 int fd; 329 unsigned short refcount, family; 330 }; 331 332 struct server { 333 union mysockaddr addr, source_addr; 334 char interface[IF_NAMESIZE+1]; 335 struct serverfd *sfd; 336 char *domain; /* set if this server only handles a domain. */ 337 int flags, tcpfd; 338 unsigned int queries, failed_queries; 339 uint32_t mark; 340 struct server *next; 341 }; 342 343 struct irec { 344 union mysockaddr addr; 345 struct in_addr netmask; /* only valid for IPv4 */ 346 int dhcp_ok, mtu; 347 struct irec *next; 348 }; 349 350 struct listener { 351 int fd, tcpfd, tftpfd, family; 352 struct irec *iface; /* only valid for non-wildcard */ 353 struct listener *next; 354 }; 355 356 /* interface and address parms from command line. */ 357 struct iname { 358 char *name; 359 union mysockaddr addr; 360 int isloop, used; 361 struct iname *next; 362 }; 363 364 /* resolv-file parms from command-line */ 365 struct resolvc { 366 struct resolvc *next; 367 int is_default, logged; 368 time_t mtime; 369 char *name; 370 }; 371 372 /* adn-hosts parms from command-line */ 373 #define AH_DIR 1 374 #define AH_INACTIVE 2 375 struct hostsfile { 376 struct hostsfile *next; 377 int flags; 378 char *fname; 379 int index; /* matches to cache entries for logging */ 380 }; 381 382 struct frec { 383 union mysockaddr source; 384 struct all_addr dest; 385 struct server *sentto; /* NULL means free */ 386 struct randfd *rfd4; 387 #ifdef HAVE_IPV6 388 struct randfd *rfd6; 389 #endif 390 unsigned int iface; 391 unsigned short orig_id, new_id; 392 int fd, forwardall; 393 unsigned int crc; 394 time_t time; 395 struct frec *next; 396 }; 397 398 /* actions in the daemon->helper RPC */ 399 #define ACTION_DEL 1 400 #define ACTION_OLD_HOSTNAME 2 401 #define ACTION_OLD 3 402 #define ACTION_ADD 4 403 404 #define DHCP_CHADDR_MAX 16 405 406 struct dhcp_lease { 407 int clid_len; /* length of client identifier */ 408 unsigned char *clid; /* clientid */ 409 char *hostname, *fqdn; /* name from client-hostname option or config */ 410 char *old_hostname; /* hostname before it moved to another lease */ 411 char auth_name; /* hostname came from config, not from client */ 412 char new; /* newly created */ 413 char changed; /* modified */ 414 char aux_changed; /* CLID or expiry changed */ 415 time_t expires; /* lease expiry */ 416 #ifdef HAVE_BROKEN_RTC 417 unsigned int length; 418 #endif 419 int hwaddr_len, hwaddr_type; 420 unsigned char hwaddr[DHCP_CHADDR_MAX]; 421 struct in_addr addr, override, giaddr; 422 unsigned char *vendorclass, *userclass, *supplied_hostname; 423 unsigned int vendorclass_len, userclass_len, supplied_hostname_len; 424 int last_interface; 425 struct dhcp_lease *next; 426 }; 427 428 struct dhcp_netid { 429 char *net; 430 struct dhcp_netid *next; 431 }; 432 433 struct dhcp_netid_list { 434 struct dhcp_netid *list; 435 struct dhcp_netid_list *next; 436 }; 437 438 struct hwaddr_config { 439 int hwaddr_len, hwaddr_type; 440 unsigned char hwaddr[DHCP_CHADDR_MAX]; 441 unsigned int wildcard_mask; 442 struct hwaddr_config *next; 443 }; 444 445 struct dhcp_config { 446 unsigned int flags; 447 int clid_len; /* length of client identifier */ 448 unsigned char *clid; /* clientid */ 449 char *hostname, *domain; 450 struct dhcp_netid netid; 451 struct in_addr addr; 452 time_t decline_time; 453 unsigned int lease_time; 454 struct hwaddr_config *hwaddr; 455 struct dhcp_config *next; 456 }; 457 458 #define CONFIG_DISABLE 1 459 #define CONFIG_CLID 2 460 #define CONFIG_TIME 8 461 #define CONFIG_NAME 16 462 #define CONFIG_ADDR 32 463 #define CONFIG_NETID 64 464 #define CONFIG_NOCLID 128 465 #define CONFIG_FROM_ETHERS 256 /* entry created by /etc/ethers */ 466 #define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */ 467 #define CONFIG_DECLINED 1024 /* address declined by client */ 468 #define CONFIG_BANK 2048 /* from dhcp hosts file */ 469 470 struct dhcp_opt { 471 int opt, len, flags; 472 union { 473 int encap; 474 unsigned int wildcard_mask; 475 unsigned char *vendor_class; 476 } u; 477 unsigned char *val; 478 struct dhcp_netid *netid; 479 struct dhcp_opt *next; 480 }; 481 482 #define DHOPT_ADDR 1 483 #define DHOPT_STRING 2 484 #define DHOPT_ENCAPSULATE 4 485 #define DHOPT_ENCAP_MATCH 8 486 #define DHOPT_FORCE 16 487 #define DHOPT_BANK 32 488 #define DHOPT_ENCAP_DONE 64 489 #define DHOPT_MATCH 128 490 #define DHOPT_VENDOR 256 491 #define DHOPT_HEX 512 492 #define DHOPT_VENDOR_MATCH 1024 493 494 struct dhcp_boot { 495 char *file, *sname; 496 struct in_addr next_server; 497 struct dhcp_netid *netid; 498 struct dhcp_boot *next; 499 }; 500 501 struct pxe_service { 502 unsigned short CSA, type; 503 char *menu, *basename; 504 struct in_addr server; 505 struct dhcp_netid *netid; 506 struct pxe_service *next; 507 }; 508 509 #define MATCH_VENDOR 1 510 #define MATCH_USER 2 511 #define MATCH_CIRCUIT 3 512 #define MATCH_REMOTE 4 513 #define MATCH_SUBSCRIBER 5 514 515 /* vendorclass, userclass, remote-id or cicuit-id */ 516 struct dhcp_vendor { 517 int len, match_type, option; 518 char *data; 519 struct dhcp_netid netid; 520 struct dhcp_vendor *next; 521 }; 522 523 struct dhcp_mac { 524 unsigned int mask; 525 int hwaddr_len, hwaddr_type; 526 unsigned char hwaddr[DHCP_CHADDR_MAX]; 527 struct dhcp_netid netid; 528 struct dhcp_mac *next; 529 }; 530 531 struct dhcp_bridge { 532 char iface[IF_NAMESIZE]; 533 struct dhcp_bridge *alias, *next; 534 }; 535 536 struct cond_domain { 537 char *domain; 538 struct in_addr start, end; 539 struct cond_domain *next; 540 }; 541 542 struct dhcp_context { 543 unsigned int lease_time, addr_epoch; 544 struct in_addr netmask, broadcast; 545 struct in_addr local, router; 546 struct in_addr start, end; /* range of available addresses */ 547 int flags; 548 struct dhcp_netid netid, *filter; 549 struct dhcp_context *next, *current; 550 }; 551 552 #define CONTEXT_STATIC 1 553 #define CONTEXT_NETMASK 2 554 #define CONTEXT_BRDCAST 4 555 #define CONTEXT_PROXY 8 556 557 558 typedef unsigned char u8; 559 typedef unsigned short u16; 560 typedef unsigned int u32; 561 562 563 struct dhcp_packet { 564 u8 op, htype, hlen, hops; 565 u32 xid; 566 u16 secs, flags; 567 struct in_addr ciaddr, yiaddr, siaddr, giaddr; 568 u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128]; 569 u8 options[312]; 570 }; 571 572 struct ping_result { 573 struct in_addr addr; 574 time_t time; 575 struct ping_result *next; 576 }; 577 578 struct tftp_file { 579 int refcount, fd; 580 off_t size; 581 dev_t dev; 582 ino_t inode; 583 char filename[]; 584 }; 585 586 struct tftp_transfer { 587 int sockfd; 588 time_t timeout; 589 int backoff; 590 unsigned int block, blocksize, expansion; 591 off_t offset; 592 struct sockaddr_in peer; 593 char opt_blocksize, opt_transize, netascii, carrylf; 594 struct tftp_file *file; 595 struct tftp_transfer *next; 596 }; 597 598 extern struct daemon { 599 /* datastuctures representing the command-line and 600 config file arguments. All set (including defaults) 601 in option.c */ 602 603 unsigned int options; 604 struct resolvc default_resolv, *resolv_files; 605 time_t last_resolv; 606 struct mx_srv_record *mxnames; 607 struct naptr *naptr; 608 struct txt_record *txt; 609 struct ptr_record *ptr; 610 struct cname *cnames; 611 struct interface_name *int_names; 612 char *mxtarget; 613 char *lease_file; 614 char *username, *groupname, *scriptuser; 615 int group_set, osport; 616 char *domain_suffix; 617 struct cond_domain *cond_domain; 618 char *runfile; 619 char *lease_change_command; 620 struct iname *if_names, *if_addrs, *if_except, *dhcp_except; 621 struct bogus_addr *bogus_addr; 622 struct server *servers; 623 int log_fac; /* log facility */ 624 char *log_file; /* optional log file */ 625 int max_logs; /* queue limit */ 626 int cachesize, ftabsize; 627 int port, query_port, min_port; 628 unsigned long local_ttl, neg_ttl; 629 struct hostsfile *addn_hosts; 630 struct dhcp_context *dhcp; 631 struct dhcp_config *dhcp_conf; 632 struct dhcp_opt *dhcp_opts, *dhcp_match; 633 struct dhcp_vendor *dhcp_vendors; 634 struct dhcp_mac *dhcp_macs; 635 struct dhcp_boot *boot_config; 636 struct pxe_service *pxe_services; 637 int enable_pxe; 638 struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic; 639 char *dhcp_hosts_file, *dhcp_opts_file; 640 int dhcp_max, tftp_max; 641 int dhcp_server_port, dhcp_client_port; 642 int start_tftp_port, end_tftp_port; 643 unsigned int min_leasetime; 644 struct doctor *doctors; 645 unsigned short edns_pktsz; 646 char *tftp_prefix; 647 648 /* globally used stuff for DNS */ 649 char *packet; /* packet buffer */ 650 int packet_buff_sz; /* size of above */ 651 char *namebuff; /* MAXDNAME size buffer */ 652 unsigned int local_answer, queries_forwarded; 653 struct frec *frec_list; 654 struct serverfd *sfds; 655 struct irec *interfaces; 656 struct listener *listeners; 657 struct server *last_server; 658 time_t forwardtime; 659 int forwardcount; 660 struct server *srv_save; /* Used for resend on DoD */ 661 size_t packet_len; /* " " */ 662 struct randfd *rfd_save; /* " " */ 663 pid_t tcp_pids[MAX_PROCS]; 664 struct randfd randomsocks[RANDOM_SOCKS]; 665 666 /* DHCP state */ 667 int dhcpfd, helperfd; 668 #if defined(HAVE_LINUX_NETWORK) 669 int netlinkfd; 670 #elif defined(HAVE_BSD_NETWORK) 671 int dhcp_raw_fd, dhcp_icmp_fd; 672 #endif 673 struct iovec dhcp_packet; 674 char *dhcp_buff, *dhcp_buff2; 675 struct ping_result *ping_results; 676 FILE *lease_stream; 677 struct dhcp_bridge *bridges; 678 679 /* DBus stuff */ 680 /* void * here to avoid depending on dbus headers outside dbus.c */ 681 void *dbus; 682 #ifdef HAVE_DBUS 683 struct watch *watches; 684 #endif 685 686 /* TFTP stuff */ 687 struct tftp_transfer *tftp_trans; 688 689 } *daemon; 690 691 /* cache.c */ 692 void cache_init(void); 693 void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg); 694 char *record_source(int index); 695 void querystr(char *str, unsigned short type); 696 struct crec *cache_find_by_addr(struct crec *crecp, 697 struct all_addr *addr, time_t now, 698 unsigned short prot); 699 struct crec *cache_find_by_name(struct crec *crecp, 700 char *name, time_t now, unsigned short prot); 701 void cache_end_insert(void); 702 void cache_start_insert(void); 703 struct crec *cache_insert(char *name, struct all_addr *addr, 704 time_t now, unsigned long ttl, unsigned short flags); 705 void cache_reload(void); 706 void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd); 707 void cache_unhash_dhcp(void); 708 void dump_cache(time_t now); 709 char *cache_get_name(struct crec *crecp); 710 char *get_domain(struct in_addr addr); 711 712 /* rfc1035.c */ 713 unsigned short extract_request(HEADER *header, size_t qlen, 714 char *name, unsigned short *typep); 715 size_t setup_reply(HEADER *header, size_t qlen, 716 struct all_addr *addrp, unsigned short flags, 717 unsigned long local_ttl); 718 int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now); 719 size_t answer_request(HEADER *header, char *limit, size_t qlen, 720 struct in_addr local_addr, struct in_addr local_netmask, time_t now); 721 int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name, 722 struct bogus_addr *addr, time_t now); 723 unsigned char *find_pseudoheader(HEADER *header, size_t plen, 724 size_t *len, unsigned char **p, int *is_sign); 725 int check_for_local_domain(char *name, time_t now); 726 unsigned int questions_crc(HEADER *header, size_t plen, char *buff); 727 size_t resize_packet(HEADER *header, size_t plen, 728 unsigned char *pheader, size_t hlen); 729 730 /* util.c */ 731 void rand_init(void); 732 unsigned short rand16(void); 733 int legal_hostname(char *c); 734 char *canonicalise(char *s, int *nomem); 735 unsigned char *do_rfc1035_name(unsigned char *p, char *sval); 736 void *safe_malloc(size_t size); 737 void safe_pipe(int *fd, int read_noblock); 738 void *whine_malloc(size_t size); 739 int sa_len(union mysockaddr *addr); 740 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2); 741 int hostname_isequal(char *a, char *b); 742 time_t dnsmasq_time(void); 743 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask); 744 int retry_send(void); 745 void prettyprint_time(char *buf, unsigned int t); 746 int prettyprint_addr(union mysockaddr *addr, char *buf); 747 int parse_hex(char *in, unsigned char *out, int maxlen, 748 unsigned int *wildcard_mask, int *mac_type); 749 int memcmp_masked(unsigned char *a, unsigned char *b, int len, 750 unsigned int mask); 751 int expand_buf(struct iovec *iov, size_t size); 752 char *print_mac(char *buff, unsigned char *mac, int len); 753 void bump_maxfd(int fd, int *max); 754 int read_write(int fd, unsigned char *packet, int size, int rw); 755 756 /* log.c */ 757 void die(char *message, char *arg1, int exit_code); 758 int log_start(struct passwd *ent_pw, int errfd); 759 int log_reopen(char *log_file); 760 void my_syslog(int priority, const char *format, ...); 761 void set_log_writer(fd_set *set, int *maxfdp); 762 void check_log_writer(fd_set *set); 763 void flush_log(void); 764 765 /* option.c */ 766 void read_opts (int argc, char **argv, char *compile_opts); 767 char *option_string(unsigned char opt, int *is_ip, int *is_name); 768 void reread_dhcp(void); 769 770 /* forward.c */ 771 void reply_query(int fd, int family, time_t now); 772 void receive_query(struct listener *listen, time_t now); 773 unsigned char *tcp_request(int confd, time_t now, 774 struct in_addr local_addr, struct in_addr netmask); 775 void server_gone(struct server *server); 776 struct frec *get_new_frec(time_t now, int *wait); 777 778 /* network.c */ 779 int indextoname(int fd, int index, char *name); 780 int local_bind(int fd, union mysockaddr *addr, char *intname, uint32_t mark, int is_tcp); 781 int random_sock(int family); 782 void pre_allocate_sfds(void); 783 int reload_servers(char *fname); 784 #ifdef __ANDROID__ 785 int set_servers(const char *servers); 786 void set_interfaces(const char *interfaces); 787 #endif 788 void check_servers(void); 789 int enumerate_interfaces(); 790 struct listener *create_wildcard_listeners(void); 791 struct listener *create_bound_listeners(void); 792 int iface_check(int family, struct all_addr *addr, char *name, int *indexp); 793 int fix_fd(int fd); 794 struct in_addr get_ifaddr(char *intr); 795 796 /* dhcp.c */ 797 #ifdef HAVE_DHCP 798 void dhcp_init(void); 799 void dhcp_packet(time_t now); 800 struct dhcp_context *address_available(struct dhcp_context *context, 801 struct in_addr addr, 802 struct dhcp_netid *netids); 803 struct dhcp_context *narrow_context(struct dhcp_context *context, 804 struct in_addr taddr, 805 struct dhcp_netid *netids); 806 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context, 807 struct in_addr *addrp, unsigned char *hwaddr, int hw_len, 808 struct dhcp_netid *netids, time_t now); 809 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type); 810 struct dhcp_config *find_config(struct dhcp_config *configs, 811 struct dhcp_context *context, 812 unsigned char *clid, int clid_len, 813 unsigned char *hwaddr, int hw_len, 814 int hw_type, char *hostname); 815 void dhcp_update_configs(struct dhcp_config *configs); 816 void dhcp_read_ethers(void); 817 void check_dhcp_hosts(int fatal); 818 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr); 819 char *strip_hostname(char *hostname); 820 char *host_from_dns(struct in_addr addr); 821 char *get_domain(struct in_addr addr); 822 #endif 823 824 /* lease.c */ 825 #ifdef HAVE_DHCP 826 void lease_update_file(time_t now); 827 void lease_update_dns(); 828 void lease_init(time_t now); 829 struct dhcp_lease *lease_allocate(struct in_addr addr); 830 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr, 831 unsigned char *clid, int hw_len, int hw_type, int clid_len); 832 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth); 833 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now); 834 void lease_set_interface(struct dhcp_lease *lease, int interface); 835 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type, 836 unsigned char *clid, int clid_len); 837 struct dhcp_lease *lease_find_by_addr(struct in_addr addr); 838 void lease_prune(struct dhcp_lease *target, time_t now); 839 void lease_update_from_configs(void); 840 int do_script_run(time_t now); 841 void rerun_scripts(void); 842 #endif 843 844 /* rfc2131.c */ 845 #ifdef HAVE_DHCP 846 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, 847 size_t sz, time_t now, int unicast_dest, int *is_inform); 848 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, 849 int clid_len, unsigned char *clid, int *len_out); 850 #endif 851 852 /* dnsmasq.c */ 853 #ifdef HAVE_DHCP 854 int make_icmp_sock(void); 855 int icmp_ping(struct in_addr addr); 856 #endif 857 void send_event(int fd, int event, int data); 858 void clear_cache_and_reload(time_t now); 859 860 /* netlink.c */ 861 #ifdef HAVE_LINUX_NETWORK 862 void netlink_init(void); 863 void netlink_multicast(void); 864 #endif 865 866 /* bpf.c */ 867 #ifdef HAVE_BSD_NETWORK 868 void init_bpf(void); 869 void send_via_bpf(struct dhcp_packet *mess, size_t len, 870 struct in_addr iface_addr, struct ifreq *ifr); 871 #endif 872 873 /* bpf.c or netlink.c */ 874 int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)()); 875 876 /* dbus.c */ 877 #ifdef HAVE_DBUS 878 char *dbus_init(void); 879 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset); 880 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset); 881 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname); 882 #endif 883 884 /* helper.c */ 885 #if defined(HAVE_DHCP) && !defined(NO_FORK) 886 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd); 887 void helper_write(void); 888 void queue_script(int action, struct dhcp_lease *lease, 889 char *hostname, time_t now); 890 int helper_buf_empty(void); 891 #endif 892 893 /* tftp.c */ 894 #ifdef HAVE_TFTP 895 void tftp_request(struct listener *listen, time_t now); 896 void check_tftp_listeners(fd_set *rset, time_t now); 897 #endif 898
