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 #include <sys/select.h> 67 #include <sys/wait.h> 68 #include <sys/time.h> 69 #include <sys/un.h> 70 #include <limits.h> 71 #include <net/if.h> 72 #include <unistd.h> 73 #include <stdio.h> 74 #include <string.h> 75 #include <stdlib.h> 76 #include <fcntl.h> 77 #include <ctype.h> 78 #include <signal.h> 79 #include <stddef.h> 80 #include <time.h> 81 #include <errno.h> 82 #include <pwd.h> 83 #include <grp.h> 84 #include <stdarg.h> 85 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__) 86 # include <netinet/if_ether.h> 87 #else 88 # include <net/ethernet.h> 89 #endif 90 #include <net/if_arp.h> 91 #include <netinet/in_systm.h> 92 #include <netinet/ip.h> 93 #include <netinet/ip_icmp.h> 94 #include <sys/uio.h> 95 #include <syslog.h> 96 #include <dirent.h> 97 #ifndef HAVE_LINUX_NETWORK 98 # include <net/if_dl.h> 99 #endif 100 101 #if defined(HAVE_LINUX_NETWORK) 102 #include <linux/capability.h> 103 /* There doesn't seem to be a universally-available 104 userpace header for these. */ 105 extern int capset(cap_user_header_t header, cap_user_data_t data); 106 extern int capget(cap_user_header_t header, cap_user_data_t data); 107 #define LINUX_CAPABILITY_VERSION_1 0x19980330 108 #define LINUX_CAPABILITY_VERSION_2 0x20071026 109 #define LINUX_CAPABILITY_VERSION_3 0x20080522 110 111 #include <sys/prctl.h> 112 #endif 113 114 /* daemon is function in the C library.... */ 115 #define daemon dnsmasq_daemon 116 117 /* Async event queue */ 118 struct event_desc { 119 int event, data; 120 }; 121 122 #define EVENT_RELOAD 1 123 #define EVENT_DUMP 2 124 #define EVENT_ALARM 3 125 #define EVENT_TERM 4 126 #define EVENT_CHILD 5 127 #define EVENT_REOPEN 6 128 #define EVENT_EXITED 7 129 #define EVENT_KILLED 8 130 #define EVENT_EXEC_ERR 9 131 #define EVENT_PIPE_ERR 10 132 #define EVENT_USER_ERR 11 133 #define EVENT_CAP_ERR 12 134 #define EVENT_PIDFILE 13 135 #define EVENT_HUSER_ERR 14 136 #define EVENT_GROUP_ERR 15 137 #define EVENT_DIE 16 138 #define EVENT_LOG_ERR 17 139 #define EVENT_FORK_ERR 18 140 141 /* Exit codes. */ 142 #define EC_GOOD 0 143 #define EC_BADCONF 1 144 #define EC_BADNET 2 145 #define EC_FILE 3 146 #define EC_NOMEM 4 147 #define EC_MISC 5 148 #define EC_INIT_OFFSET 10 149 150 /* Min buffer size: we check after adding each record, so there must be 151 memory for the largest packet, and the largest record so the 152 min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000. 153 This might be increased is EDNS packet size if greater than the minimum. 154 */ 155 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ 156 157 #define OPT_BOGUSPRIV (1u<<0) 158 #define OPT_FILTER (1u<<1) 159 #define OPT_LOG (1u<<2) 160 #define OPT_SELFMX (1u<<3) 161 #define OPT_NO_HOSTS (1u<<4) 162 #define OPT_NO_POLL (1u<<5) 163 #define OPT_DEBUG (1u<<6) 164 #define OPT_ORDER (1u<<7) 165 #define OPT_NO_RESOLV (1u<<8) 166 #define OPT_EXPAND (1u<<9) 167 #define OPT_LOCALMX (1u<<10) 168 #define OPT_NO_NEG (1u<<11) 169 #define OPT_NODOTS_LOCAL (1u<<12) 170 #define OPT_NOWILD (1u<<13) 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 193 194 struct all_addr { 195 union { 196 struct in_addr addr4; 197 #ifdef HAVE_IPV6 198 struct in6_addr addr6; 199 #endif 200 } addr; 201 }; 202 203 struct bogus_addr { 204 struct in_addr addr; 205 struct bogus_addr *next; 206 }; 207 208 /* dns doctor param */ 209 struct doctor { 210 struct in_addr in, end, out, mask; 211 struct doctor *next; 212 }; 213 214 struct mx_srv_record { 215 char *name, *target; 216 int issrv, srvport, priority, weight; 217 unsigned int offset; 218 struct mx_srv_record *next; 219 }; 220 221 struct naptr { 222 char *name, *replace, *regexp, *services, *flags; 223 unsigned int order, pref; 224 struct naptr *next; 225 }; 226 227 struct txt_record { 228 char *name, *txt; 229 unsigned short class, len; 230 struct txt_record *next; 231 }; 232 233 struct ptr_record { 234 char *name, *ptr; 235 struct ptr_record *next; 236 }; 237 238 struct cname { 239 char *alias, *target; 240 struct cname *next; 241 }; 242 243 struct interface_name { 244 char *name; /* domain name */ 245 char *intr; /* interface name */ 246 struct interface_name *next; 247 }; 248 249 union bigname { 250 char name[MAXDNAME]; 251 union bigname *next; /* freelist */ 252 }; 253 254 struct 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. */ 293 union 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 */ 312 313 struct serverfd { 314 int fd; 315 union mysockaddr source_addr; 316 char interface[IF_NAMESIZE+1]; 317 struct serverfd *next; 318 uint32_t mark; 319 }; 320 321 struct randfd { 322 int fd; 323 unsigned short refcount, family; 324 }; 325 326 struct server { 327 union mysockaddr addr, source_addr; 328 char interface[IF_NAMESIZE+1]; 329 struct serverfd *sfd; 330 char *domain; /* set if this server only handles a domain. */ 331 int flags, tcpfd; 332 unsigned int queries, failed_queries; 333 uint32_t mark; 334 struct server *next; 335 }; 336 337 struct irec { 338 union mysockaddr addr; 339 struct in_addr netmask; /* only valid for IPv4 */ 340 int dhcp_ok, mtu; 341 struct irec *next; 342 }; 343 344 struct listener { 345 int fd, tcpfd, family; 346 struct irec *iface; /* only valid for non-wildcard */ 347 struct listener *next; 348 }; 349 350 /* interface and address parms from command line. */ 351 struct iname { 352 char *name; 353 union mysockaddr addr; 354 int isloop, used; 355 struct iname *next; 356 }; 357 358 /* resolv-file parms from command-line */ 359 struct resolvc { 360 struct resolvc *next; 361 int is_default, logged; 362 time_t mtime; 363 char *name; 364 }; 365 366 /* adn-hosts parms from command-line */ 367 #define AH_DIR 1 368 #define AH_INACTIVE 2 369 struct hostsfile { 370 struct hostsfile *next; 371 int flags; 372 char *fname; 373 int index; /* matches to cache entries for logging */ 374 }; 375 376 struct frec { 377 union mysockaddr source; 378 struct all_addr dest; 379 struct server *sentto; /* NULL means free */ 380 struct randfd *rfd4; 381 #ifdef HAVE_IPV6 382 struct randfd *rfd6; 383 #endif 384 unsigned int iface; 385 unsigned short orig_id, new_id; 386 int fd, forwardall; 387 unsigned int crc; 388 time_t time; 389 struct frec *next; 390 }; 391 392 /* actions in the daemon->helper RPC */ 393 #define ACTION_DEL 1 394 #define ACTION_OLD_HOSTNAME 2 395 #define ACTION_OLD 3 396 #define ACTION_ADD 4 397 398 #define DHCP_CHADDR_MAX 16 399 400 struct dhcp_lease { 401 int clid_len; /* length of client identifier */ 402 unsigned char *clid; /* clientid */ 403 char *hostname, *fqdn; /* name from client-hostname option or config */ 404 char *old_hostname; /* hostname before it moved to another lease */ 405 char auth_name; /* hostname came from config, not from client */ 406 char new; /* newly created */ 407 char changed; /* modified */ 408 char aux_changed; /* CLID or expiry changed */ 409 time_t expires; /* lease expiry */ 410 #ifdef HAVE_BROKEN_RTC 411 unsigned int length; 412 #endif 413 int hwaddr_len, hwaddr_type; 414 unsigned char hwaddr[DHCP_CHADDR_MAX]; 415 struct in_addr addr, override, giaddr; 416 unsigned char *vendorclass, *userclass, *supplied_hostname; 417 unsigned int vendorclass_len, userclass_len, supplied_hostname_len; 418 int last_interface; 419 struct dhcp_lease *next; 420 }; 421 422 struct dhcp_netid { 423 char *net; 424 struct dhcp_netid *next; 425 }; 426 427 struct dhcp_netid_list { 428 struct dhcp_netid *list; 429 struct dhcp_netid_list *next; 430 }; 431 432 struct hwaddr_config { 433 int hwaddr_len, hwaddr_type; 434 unsigned char hwaddr[DHCP_CHADDR_MAX]; 435 unsigned int wildcard_mask; 436 struct hwaddr_config *next; 437 }; 438 439 struct dhcp_config { 440 unsigned int flags; 441 int clid_len; /* length of client identifier */ 442 unsigned char *clid; /* clientid */ 443 char *hostname, *domain; 444 struct dhcp_netid netid; 445 struct in_addr addr; 446 time_t decline_time; 447 unsigned int lease_time; 448 struct hwaddr_config *hwaddr; 449 struct dhcp_config *next; 450 }; 451 452 #define CONFIG_DISABLE 1 453 #define CONFIG_CLID 2 454 #define CONFIG_TIME 8 455 #define CONFIG_NAME 16 456 #define CONFIG_ADDR 32 457 #define CONFIG_NETID 64 458 #define CONFIG_NOCLID 128 459 #define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */ 460 #define CONFIG_DECLINED 1024 /* address declined by client */ 461 #define CONFIG_BANK 2048 /* from dhcp hosts file */ 462 463 struct dhcp_opt { 464 int opt, len, flags; 465 union { 466 int encap; 467 unsigned int wildcard_mask; 468 unsigned char *vendor_class; 469 } u; 470 unsigned char *val; 471 struct dhcp_netid *netid; 472 struct dhcp_opt *next; 473 }; 474 475 #define DHOPT_ADDR 1 476 #define DHOPT_STRING 2 477 #define DHOPT_ENCAPSULATE 4 478 #define DHOPT_ENCAP_MATCH 8 479 #define DHOPT_FORCE 16 480 #define DHOPT_BANK 32 481 #define DHOPT_ENCAP_DONE 64 482 #define DHOPT_MATCH 128 483 #define DHOPT_VENDOR 256 484 #define DHOPT_HEX 512 485 #define DHOPT_VENDOR_MATCH 1024 486 487 struct dhcp_boot { 488 char *file, *sname; 489 struct in_addr next_server; 490 struct dhcp_netid *netid; 491 struct dhcp_boot *next; 492 }; 493 494 struct pxe_service { 495 unsigned short CSA, type; 496 char *menu, *basename; 497 struct in_addr server; 498 struct dhcp_netid *netid; 499 struct pxe_service *next; 500 }; 501 502 #define MATCH_VENDOR 1 503 #define MATCH_USER 2 504 #define MATCH_CIRCUIT 3 505 #define MATCH_REMOTE 4 506 #define MATCH_SUBSCRIBER 5 507 508 /* vendorclass, userclass, remote-id or cicuit-id */ 509 struct dhcp_vendor { 510 int len, match_type, option; 511 char *data; 512 struct dhcp_netid netid; 513 struct dhcp_vendor *next; 514 }; 515 516 struct dhcp_mac { 517 unsigned int mask; 518 int hwaddr_len, hwaddr_type; 519 unsigned char hwaddr[DHCP_CHADDR_MAX]; 520 struct dhcp_netid netid; 521 struct dhcp_mac *next; 522 }; 523 524 struct dhcp_bridge { 525 char iface[IF_NAMESIZE]; 526 struct dhcp_bridge *alias, *next; 527 }; 528 529 struct cond_domain { 530 char *domain; 531 struct in_addr start, end; 532 struct cond_domain *next; 533 }; 534 535 struct dhcp_context { 536 unsigned int lease_time, addr_epoch; 537 struct in_addr netmask, broadcast; 538 struct in_addr local, router; 539 struct in_addr start, end; /* range of available addresses */ 540 int flags; 541 struct dhcp_netid netid, *filter; 542 struct dhcp_context *next, *current; 543 }; 544 545 #define CONTEXT_STATIC 1 546 #define CONTEXT_NETMASK 2 547 #define CONTEXT_BRDCAST 4 548 #define CONTEXT_PROXY 8 549 550 551 typedef unsigned char u8; 552 typedef unsigned short u16; 553 typedef unsigned int u32; 554 555 556 struct dhcp_packet { 557 u8 op, htype, hlen, hops; 558 u32 xid; 559 u16 secs, flags; 560 struct in_addr ciaddr, yiaddr, siaddr, giaddr; 561 u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128]; 562 u8 options[312]; 563 }; 564 565 struct ping_result { 566 struct in_addr addr; 567 time_t time; 568 struct ping_result *next; 569 }; 570 571 extern struct daemon { 572 /* datastuctures representing the command-line and 573 config file arguments. All set (including defaults) 574 in option.c */ 575 576 unsigned int options; 577 struct resolvc default_resolv, *resolv_files; 578 time_t last_resolv; 579 struct mx_srv_record *mxnames; 580 struct naptr *naptr; 581 struct txt_record *txt; 582 struct ptr_record *ptr; 583 struct cname *cnames; 584 struct interface_name *int_names; 585 char *mxtarget; 586 char *lease_file; 587 char *username, *groupname, *scriptuser; 588 int group_set, osport; 589 char *domain_suffix; 590 struct cond_domain *cond_domain; 591 char *runfile; 592 char *lease_change_command; 593 struct iname *if_names, *if_addrs, *if_except, *dhcp_except; 594 struct bogus_addr *bogus_addr; 595 struct server *servers; 596 int log_fac; /* log facility */ 597 char *log_file; /* optional log file */ 598 int max_logs; /* queue limit */ 599 int cachesize, ftabsize; 600 int port, query_port, min_port; 601 unsigned long local_ttl, neg_ttl; 602 struct hostsfile *addn_hosts; 603 struct dhcp_context *dhcp; 604 struct dhcp_config *dhcp_conf; 605 struct dhcp_opt *dhcp_opts, *dhcp_match; 606 struct dhcp_vendor *dhcp_vendors; 607 struct dhcp_mac *dhcp_macs; 608 struct dhcp_boot *boot_config; 609 struct pxe_service *pxe_services; 610 int enable_pxe; 611 struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic; 612 char *dhcp_hosts_file, *dhcp_opts_file; 613 int dhcp_max; 614 int dhcp_server_port, dhcp_client_port; 615 unsigned int min_leasetime; 616 struct doctor *doctors; 617 unsigned short edns_pktsz; 618 uint32_t listen_mark; 619 620 /* globally used stuff for DNS */ 621 char *packet; /* packet buffer */ 622 int packet_buff_sz; /* size of above */ 623 char *namebuff; /* MAXDNAME size buffer */ 624 unsigned int local_answer, queries_forwarded; 625 struct frec *frec_list; 626 struct serverfd *sfds; 627 struct irec *interfaces; 628 struct listener *listeners; 629 struct server *last_server; 630 time_t forwardtime; 631 int forwardcount; 632 struct server *srv_save; /* Used for resend on DoD */ 633 size_t packet_len; /* " " */ 634 struct randfd *rfd_save; /* " " */ 635 pid_t tcp_pids[MAX_PROCS]; 636 struct randfd randomsocks[RANDOM_SOCKS]; 637 638 /* DHCP state */ 639 int dhcpfd, helperfd; 640 int netlinkfd; 641 struct iovec dhcp_packet; 642 char *dhcp_buff, *dhcp_buff2; 643 struct ping_result *ping_results; 644 FILE *lease_stream; 645 struct dhcp_bridge *bridges; 646 647 } *daemon; 648 649 /* cache.c */ 650 void cache_init(void); 651 void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg); 652 char *record_source(int index); 653 void querystr(char *str, unsigned short type); 654 struct crec *cache_find_by_addr(struct crec *crecp, 655 struct all_addr *addr, time_t now, 656 unsigned short prot); 657 struct crec *cache_find_by_name(struct crec *crecp, 658 char *name, time_t now, unsigned short prot); 659 void cache_end_insert(void); 660 void cache_start_insert(void); 661 struct crec *cache_insert(char *name, struct all_addr *addr, 662 time_t now, unsigned long ttl, unsigned short flags); 663 void cache_reload(void); 664 void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd); 665 void cache_unhash_dhcp(void); 666 void dump_cache(time_t now); 667 char *cache_get_name(struct crec *crecp); 668 char *get_domain(struct in_addr addr); 669 670 /* rfc1035.c */ 671 unsigned short extract_request(HEADER *header, size_t qlen, 672 char *name, unsigned short *typep); 673 size_t setup_reply(HEADER *header, size_t qlen, 674 struct all_addr *addrp, unsigned short flags, 675 unsigned long local_ttl); 676 int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now); 677 size_t answer_request(HEADER *header, char *limit, size_t qlen, 678 struct in_addr local_addr, struct in_addr local_netmask, time_t now); 679 int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name, 680 struct bogus_addr *addr, time_t now); 681 unsigned char *find_pseudoheader(HEADER *header, size_t plen, 682 size_t *len, unsigned char **p, int *is_sign); 683 int check_for_local_domain(char *name, time_t now); 684 unsigned int questions_crc(HEADER *header, size_t plen, char *buff); 685 size_t resize_packet(HEADER *header, size_t plen, 686 unsigned char *pheader, size_t hlen); 687 688 /* util.c */ 689 void rand_init(void); 690 unsigned short rand16(void); 691 int legal_hostname(char *c); 692 char *canonicalise(char *s, int *nomem); 693 unsigned char *do_rfc1035_name(unsigned char *p, char *sval); 694 void *safe_malloc(size_t size); 695 void safe_pipe(int *fd, int read_noblock); 696 void *whine_malloc(size_t size); 697 int sa_len(union mysockaddr *addr); 698 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2); 699 int hostname_isequal(char *a, char *b); 700 time_t dnsmasq_time(void); 701 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask); 702 int retry_send(void); 703 int parse_addr(int family, const char *addrstr, union mysockaddr *addr); 704 void prettyprint_time(char *buf, unsigned int t); 705 int prettyprint_addr(const union mysockaddr *addr, char *buf); 706 int parse_hex(char *in, unsigned char *out, int maxlen, 707 unsigned int *wildcard_mask, int *mac_type); 708 int memcmp_masked(unsigned char *a, unsigned char *b, int len, 709 unsigned int mask); 710 int expand_buf(struct iovec *iov, size_t size); 711 char *print_mac(char *buff, unsigned char *mac, int len); 712 void bump_maxfd(int fd, int *max); 713 int read_write(int fd, unsigned char *packet, int size, int rw); 714 715 /* log.c */ 716 void die(char *message, char *arg1, int exit_code); 717 int log_start(struct passwd *ent_pw, int errfd); 718 int log_reopen(char *log_file); 719 void my_syslog(int priority, const char *format, ...); 720 void set_log_writer(fd_set *set, int *maxfdp); 721 void check_log_writer(fd_set *set); 722 void flush_log(void); 723 724 /* option.c */ 725 void read_opts (int argc, char **argv, char *compile_opts); 726 char *option_string(unsigned char opt, int *is_ip, int *is_name); 727 void reread_dhcp(void); 728 729 /* forward.c */ 730 void reply_query(int fd, int family, time_t now); 731 void receive_query(struct listener *listen, time_t now); 732 unsigned char *tcp_request(int confd, time_t now, 733 struct in_addr local_addr, struct in_addr netmask); 734 void server_gone(struct server *server); 735 struct frec *get_new_frec(time_t now, int *wait); 736 737 /* network.c */ 738 int indextoname(int fd, int index, char *name); 739 int local_bind(int fd, union mysockaddr *addr, char *intname, uint32_t mark, int is_tcp); 740 int random_sock(int family); 741 void pre_allocate_sfds(void); 742 int reload_servers(char *fname); 743 #if defined(__ANDROID__) && !defined(__BRILLO__) 744 int set_servers(const char *servers); 745 void set_interfaces(const char *interfaces); 746 #endif 747 void check_servers(void); 748 int enumerate_interfaces(); 749 struct listener *create_wildcard_listeners(void); 750 struct listener *create_bound_listeners(void); 751 int iface_check(int family, struct all_addr *addr, char *name, int *indexp); 752 int fix_fd(int fd); 753 struct in_addr get_ifaddr(char *intr); 754 755 /* dhcp.c */ 756 #ifdef HAVE_DHCP 757 void dhcp_init(void); 758 void dhcp_packet(time_t now); 759 struct dhcp_context *address_available(struct dhcp_context *context, 760 struct in_addr addr, 761 struct dhcp_netid *netids); 762 struct dhcp_context *narrow_context(struct dhcp_context *context, 763 struct in_addr taddr, 764 struct dhcp_netid *netids); 765 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context, 766 struct in_addr *addrp, unsigned char *hwaddr, int hw_len, 767 struct dhcp_netid *netids, time_t now); 768 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type); 769 struct dhcp_config *find_config(struct dhcp_config *configs, 770 struct dhcp_context *context, 771 unsigned char *clid, int clid_len, 772 unsigned char *hwaddr, int hw_len, 773 int hw_type, char *hostname); 774 void dhcp_update_configs(struct dhcp_config *configs); 775 void check_dhcp_hosts(int fatal); 776 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr); 777 char *strip_hostname(char *hostname); 778 char *host_from_dns(struct in_addr addr); 779 char *get_domain(struct in_addr addr); 780 #endif 781 782 /* lease.c */ 783 #ifdef HAVE_DHCP 784 void lease_update_file(time_t now); 785 void lease_update_dns(); 786 void lease_init(time_t now); 787 struct dhcp_lease *lease_allocate(struct in_addr addr); 788 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr, 789 unsigned char *clid, int hw_len, int hw_type, int clid_len); 790 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth); 791 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now); 792 void lease_set_interface(struct dhcp_lease *lease, int interface); 793 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type, 794 unsigned char *clid, int clid_len); 795 struct dhcp_lease *lease_find_by_addr(struct in_addr addr); 796 void lease_prune(struct dhcp_lease *target, time_t now); 797 void lease_update_from_configs(void); 798 int do_script_run(time_t now); 799 void rerun_scripts(void); 800 #endif 801 802 /* rfc2131.c */ 803 #ifdef HAVE_DHCP 804 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, 805 size_t sz, time_t now, int unicast_dest, int *is_inform); 806 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, 807 int clid_len, unsigned char *clid, int *len_out); 808 #endif 809 810 /* dnsmasq.c */ 811 #ifdef HAVE_DHCP 812 int make_icmp_sock(void); 813 int icmp_ping(struct in_addr addr); 814 #endif 815 void send_event(int fd, int event, int data); 816 void clear_cache_and_reload(time_t now); 817 818 /* netlink.c */ 819 #ifdef HAVE_LINUX_NETWORK 820 void netlink_init(void); 821 void netlink_multicast(void); 822 #endif 823 824 /* bpf.c or netlink.c */ 825 int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)()); 826 827 /* helper.c */ 828 #if defined(HAVE_DHCP) && !defined(NO_FORK) 829 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd); 830 void helper_write(void); 831 void queue_script(int action, struct dhcp_lease *lease, 832 char *hostname, time_t now); 833 int helper_buf_empty(void); 834 #endif 835
