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 <netinet/in.h> 35 #include <sys/socket.h> 36 #include <sys/types.h> 37 38 #ifdef __APPLE__ 39 #include <arpa/nameser_compat.h> 40 #include <nameser.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 <ctype.h> 65 #include <errno.h> 66 #include <fcntl.h> 67 #include <grp.h> 68 #include <limits.h> 69 #include <net/if.h> 70 #include <pwd.h> 71 #include <signal.h> 72 #include <stdarg.h> 73 #include <stddef.h> 74 #include <stdio.h> 75 #include <stdlib.h> 76 #include <string.h> 77 #include <sys/ioctl.h> 78 #include <sys/select.h> 79 #include <sys/stat.h> 80 #include <sys/time.h> 81 #include <sys/un.h> 82 #include <sys/wait.h> 83 #include <time.h> 84 #include <unistd.h> 85 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined(__sun) || \ 86 defined(__ANDROID__) 87 #include <netinet/if_ether.h> 88 #else 89 #include <net/ethernet.h> 90 #endif 91 #include <dirent.h> 92 #include <net/if_arp.h> 93 #include <netinet/in_systm.h> 94 #include <netinet/ip.h> 95 #include <netinet/ip_icmp.h> 96 #include <sys/uio.h> 97 #include <syslog.h> 98 #ifndef HAVE_LINUX_NETWORK 99 #include <net/if_dl.h> 100 #endif 101 102 #if defined(HAVE_LINUX_NETWORK) 103 #include <linux/capability.h> 104 /* There doesn't seem to be a universally-available 105 userpace header for these. */ 106 extern int capset(cap_user_header_t header, cap_user_data_t data); 107 extern int capget(cap_user_header_t header, cap_user_data_t data); 108 #define LINUX_CAPABILITY_VERSION_1 0x19980330 109 #define LINUX_CAPABILITY_VERSION_2 0x20071026 110 #define LINUX_CAPABILITY_VERSION_3 0x20080522 111 112 #include <sys/prctl.h> 113 #endif 114 115 /* daemon is function in the C library.... */ 116 #define daemon dnsmasq_daemon 117 118 /* Async event queue */ 119 struct event_desc { 120 int event, data; 121 }; 122 123 #define EVENT_RELOAD 1 124 #define EVENT_DUMP 2 125 #define EVENT_ALARM 3 126 #define EVENT_TERM 4 127 #define EVENT_CHILD 5 128 #define EVENT_REOPEN 6 129 #define EVENT_EXITED 7 130 #define EVENT_KILLED 8 131 #define EVENT_EXEC_ERR 9 132 #define EVENT_PIPE_ERR 10 133 #define EVENT_USER_ERR 11 134 #define EVENT_CAP_ERR 12 135 #define EVENT_PIDFILE 13 136 #define EVENT_HUSER_ERR 14 137 #define EVENT_GROUP_ERR 15 138 #define EVENT_DIE 16 139 #define EVENT_LOG_ERR 17 140 #define EVENT_FORK_ERR 18 141 142 /* Exit codes. */ 143 #define EC_GOOD 0 144 #define EC_BADCONF 1 145 #define EC_BADNET 2 146 #define EC_FILE 3 147 #define EC_NOMEM 4 148 #define EC_MISC 5 149 #define EC_INIT_OFFSET 10 150 151 /* Min buffer size: we check after adding each record, so there must be 152 memory for the largest packet, and the largest record so the 153 min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000. 154 This might be increased is EDNS packet size if greater than the minimum. 155 */ 156 #define DNSMASQ_PACKETSZ PACKETSZ + MAXDNAME + RRFIXEDSZ 157 158 #define OPT_BOGUSPRIV (1u << 0) 159 #define OPT_FILTER (1u << 1) 160 #define OPT_LOG (1u << 2) 161 #define OPT_SELFMX (1u << 3) 162 #define OPT_NO_HOSTS (1u << 4) 163 #define OPT_NO_POLL (1u << 5) 164 #define OPT_DEBUG (1u << 6) 165 #define OPT_ORDER (1u << 7) 166 #define OPT_NO_RESOLV (1u << 8) 167 #define OPT_EXPAND (1u << 9) 168 #define OPT_LOCALMX (1u << 10) 169 #define OPT_NO_NEG (1u << 11) 170 #define OPT_NODOTS_LOCAL (1u << 12) 171 #define OPT_NOWILD (1u << 13) 172 #define OPT_RESOLV_DOMAIN (1u << 15) 173 #define OPT_NO_FORK (1u << 16) 174 #define OPT_AUTHORITATIVE (1u << 17) 175 #define OPT_LOCALISE (1u << 18) 176 #define OPT_DBUS (1u << 19) 177 #define OPT_DHCP_FQDN (1u << 20) 178 #define OPT_NO_PING (1u << 21) 179 #define OPT_LEASE_RO (1u << 22) 180 #define OPT_ALL_SERVERS (1u << 23) 181 #define OPT_RELOAD (1u << 24) 182 #define OPT_TFTP (1u << 25) 183 #define OPT_TFTP_SECURE (1u << 26) 184 #define OPT_TFTP_NOBLOCK (1u << 27) 185 #define OPT_LOG_OPTS (1u << 28) 186 #define OPT_TFTP_APREF (1u << 29) 187 #define OPT_NO_OVERRIDE (1u << 30) 188 #define OPT_NO_REBIND (1u << 31) 189 190 /* extra flags for my_syslog, we use a couple of facilities since they are known 191 not to occupy the same bits as priorities, no matter how syslog.h is set up. */ 192 #define MS_TFTP LOG_USER 193 #define MS_DHCP LOG_DAEMON 194 195 struct all_addr { 196 union { 197 struct in_addr addr4; 198 #ifdef HAVE_IPV6 199 struct in6_addr addr6; 200 #endif 201 } addr; 202 }; 203 204 struct bogus_addr { 205 struct in_addr addr; 206 struct bogus_addr* next; 207 }; 208 209 /* dns doctor param */ 210 struct doctor { 211 struct in_addr in, end, out, mask; 212 struct doctor* next; 213 }; 214 215 struct mx_srv_record { 216 char *name, *target; 217 int issrv, srvport, priority, weight; 218 unsigned int offset; 219 struct mx_srv_record* next; 220 }; 221 222 struct naptr { 223 char *name, *replace, *regexp, *services, *flags; 224 unsigned int order, pref; 225 struct naptr* next; 226 }; 227 228 struct txt_record { 229 char *name, *txt; 230 unsigned short class, len; 231 struct txt_record* next; 232 }; 233 234 struct ptr_record { 235 char *name, *ptr; 236 struct ptr_record* next; 237 }; 238 239 struct cname { 240 char *alias, *target; 241 struct cname* next; 242 }; 243 244 struct interface_name { 245 char* name; /* domain name */ 246 char* intr; /* interface name */ 247 struct interface_name* next; 248 }; 249 250 union bigname { 251 char name[MAXDNAME]; 252 union bigname* next; /* freelist */ 253 }; 254 255 struct crec { 256 struct crec *next, *prev, *hash_next; 257 time_t ttd; /* time to die */ 258 int uid; 259 union { 260 struct all_addr addr; 261 struct { 262 struct crec* cache; 263 int uid; 264 } cname; 265 } addr; 266 unsigned short flags; 267 union { 268 char sname[SMALLDNAME]; 269 union bigname* bname; 270 char* namep; 271 } name; 272 }; 273 274 #define F_IMMORTAL 1 275 #define F_CONFIG 2 276 #define F_REVERSE 4 277 #define F_FORWARD 8 278 #define F_DHCP 16 279 #define F_NEG 32 280 #define F_HOSTS 64 281 #define F_IPV4 128 282 #define F_IPV6 256 283 #define F_BIGNAME 512 284 #define F_UPSTREAM 1024 285 #define F_SERVER 2048 286 #define F_NXDOMAIN 4096 287 #define F_QUERY 8192 288 #define F_CNAME 16384 289 #define F_NOERR 32768 290 291 /* struct sockaddr is not large enough to hold any address, 292 and specifically not big enough to hold an IPv6 address. 293 Blech. Roll our own. */ 294 union mysockaddr { 295 struct sockaddr sa; 296 struct sockaddr_in in; 297 #if defined(HAVE_IPV6) 298 struct sockaddr_in6 in6; 299 #endif 300 }; 301 302 #define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */ 303 #define SERV_NO_ADDR 2 /* no server, this domain is local only */ 304 #define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */ 305 #define SERV_HAS_DOMAIN 8 /* server for one domain only */ 306 #define SERV_HAS_SOURCE 16 /* source address defined */ 307 #define SERV_FOR_NODOTS 32 /* server for names with no domain part only */ 308 #define SERV_WARNED_RECURSIVE 64 /* avoid warning spam */ 309 #define SERV_FROM_DBUS 128 /* 1 if source is DBus */ 310 #define SERV_MARK 256 /* for mark-and-delete */ 311 #define SERV_TYPE (SERV_HAS_DOMAIN | SERV_FOR_NODOTS) 312 #define SERV_COUNTED 512 /* workspace for log code */ 313 314 struct serverfd { 315 int fd; 316 union mysockaddr source_addr; 317 char interface[IF_NAMESIZE + 1]; 318 struct serverfd* next; 319 uint32_t mark; 320 }; 321 322 struct randfd { 323 int fd; 324 unsigned short refcount, family; 325 }; 326 327 struct server { 328 union mysockaddr addr, source_addr; 329 char interface[IF_NAMESIZE + 1]; 330 struct serverfd* sfd; 331 char* domain; /* set if this server only handles a domain. */ 332 int flags, tcpfd; 333 unsigned int queries, failed_queries; 334 uint32_t mark; 335 struct server* next; 336 }; 337 338 struct irec { 339 union mysockaddr addr; 340 struct in_addr netmask; /* only valid for IPv4 */ 341 int dhcp_ok, mtu; 342 struct irec* next; 343 }; 344 345 struct listener { 346 int fd, tcpfd, family; 347 struct irec* iface; /* only valid for non-wildcard */ 348 struct listener* next; 349 }; 350 351 /* interface and address parms from command line. */ 352 struct iname { 353 char* name; 354 union mysockaddr addr; 355 int isloop, used; 356 struct iname* next; 357 }; 358 359 /* resolv-file parms from command-line */ 360 struct resolvc { 361 struct resolvc* next; 362 int is_default, logged; 363 time_t mtime; 364 char* name; 365 }; 366 367 /* adn-hosts parms from command-line */ 368 #define AH_DIR 1 369 #define AH_INACTIVE 2 370 struct hostsfile { 371 struct hostsfile* next; 372 int flags; 373 char* fname; 374 int index; /* matches to cache entries for logging */ 375 }; 376 377 struct frec { 378 union mysockaddr source; 379 struct all_addr dest; 380 struct server* sentto; /* NULL means free */ 381 struct randfd* rfd4; 382 #ifdef HAVE_IPV6 383 struct randfd* rfd6; 384 #endif 385 unsigned int iface; 386 unsigned short orig_id, new_id; 387 int fd, forwardall; 388 unsigned int crc; 389 time_t time; 390 struct frec* next; 391 }; 392 393 /* actions in the daemon->helper RPC */ 394 #define ACTION_DEL 1 395 #define ACTION_OLD_HOSTNAME 2 396 #define ACTION_OLD 3 397 #define ACTION_ADD 4 398 399 #define DHCP_CHADDR_MAX 16 400 401 struct dhcp_lease { 402 int clid_len; /* length of client identifier */ 403 unsigned char* clid; /* clientid */ 404 char *hostname, *fqdn; /* name from client-hostname option or config */ 405 char* old_hostname; /* hostname before it moved to another lease */ 406 char auth_name; /* hostname came from config, not from client */ 407 char new; /* newly created */ 408 char changed; /* modified */ 409 char aux_changed; /* CLID or expiry changed */ 410 time_t expires; /* lease expiry */ 411 #ifdef HAVE_BROKEN_RTC 412 unsigned int length; 413 #endif 414 int hwaddr_len, hwaddr_type; 415 unsigned char hwaddr[DHCP_CHADDR_MAX]; 416 struct in_addr addr, override, giaddr; 417 unsigned char *vendorclass, *userclass, *supplied_hostname; 418 unsigned int vendorclass_len, userclass_len, supplied_hostname_len; 419 int last_interface; 420 struct dhcp_lease* next; 421 }; 422 423 struct dhcp_netid { 424 char* net; 425 struct dhcp_netid* next; 426 }; 427 428 struct dhcp_netid_list { 429 struct dhcp_netid* list; 430 struct dhcp_netid_list* next; 431 }; 432 433 struct hwaddr_config { 434 int hwaddr_len, hwaddr_type; 435 unsigned char hwaddr[DHCP_CHADDR_MAX]; 436 unsigned int wildcard_mask; 437 struct hwaddr_config* next; 438 }; 439 440 struct dhcp_config { 441 unsigned int flags; 442 int clid_len; /* length of client identifier */ 443 unsigned char* clid; /* clientid */ 444 char *hostname, *domain; 445 struct dhcp_netid netid; 446 struct in_addr addr; 447 time_t decline_time; 448 unsigned int lease_time; 449 struct hwaddr_config* hwaddr; 450 struct dhcp_config* next; 451 }; 452 453 #define CONFIG_DISABLE 1 454 #define CONFIG_CLID 2 455 #define CONFIG_TIME 8 456 #define CONFIG_NAME 16 457 #define CONFIG_ADDR 32 458 #define CONFIG_NETID 64 459 #define CONFIG_NOCLID 128 460 #define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */ 461 #define CONFIG_DECLINED 1024 /* address declined by client */ 462 #define CONFIG_BANK 2048 /* from dhcp hosts file */ 463 464 struct dhcp_opt { 465 int opt, len, flags; 466 union { 467 int encap; 468 unsigned int wildcard_mask; 469 unsigned char* vendor_class; 470 } u; 471 unsigned char* val; 472 struct dhcp_netid* netid; 473 struct dhcp_opt* next; 474 }; 475 476 #define DHOPT_ADDR 1 477 #define DHOPT_STRING 2 478 #define DHOPT_ENCAPSULATE 4 479 #define DHOPT_ENCAP_MATCH 8 480 #define DHOPT_FORCE 16 481 #define DHOPT_BANK 32 482 #define DHOPT_ENCAP_DONE 64 483 #define DHOPT_MATCH 128 484 #define DHOPT_VENDOR 256 485 #define DHOPT_HEX 512 486 #define DHOPT_VENDOR_MATCH 1024 487 488 struct dhcp_boot { 489 char *file, *sname; 490 struct in_addr next_server; 491 struct dhcp_netid* netid; 492 struct dhcp_boot* next; 493 }; 494 495 struct pxe_service { 496 unsigned short CSA, type; 497 char *menu, *basename; 498 struct in_addr server; 499 struct dhcp_netid* netid; 500 struct pxe_service* next; 501 }; 502 503 #define MATCH_VENDOR 1 504 #define MATCH_USER 2 505 #define MATCH_CIRCUIT 3 506 #define MATCH_REMOTE 4 507 #define MATCH_SUBSCRIBER 5 508 509 /* vendorclass, userclass, remote-id or cicuit-id */ 510 struct dhcp_vendor { 511 int len, match_type, option; 512 char* data; 513 struct dhcp_netid netid; 514 struct dhcp_vendor* next; 515 }; 516 517 struct dhcp_mac { 518 unsigned int mask; 519 int hwaddr_len, hwaddr_type; 520 unsigned char hwaddr[DHCP_CHADDR_MAX]; 521 struct dhcp_netid netid; 522 struct dhcp_mac* next; 523 }; 524 525 struct dhcp_bridge { 526 char iface[IF_NAMESIZE]; 527 struct dhcp_bridge *alias, *next; 528 }; 529 530 struct cond_domain { 531 char* domain; 532 struct in_addr start, end; 533 struct cond_domain* next; 534 }; 535 536 struct dhcp_context { 537 unsigned int lease_time, addr_epoch; 538 struct in_addr netmask, broadcast; 539 struct in_addr local, router; 540 struct in_addr start, end; /* range of available addresses */ 541 int flags; 542 struct dhcp_netid netid, *filter; 543 struct dhcp_context *next, *current; 544 }; 545 546 #define CONTEXT_STATIC 1 547 #define CONTEXT_NETMASK 2 548 #define CONTEXT_BRDCAST 4 549 #define CONTEXT_PROXY 8 550 551 typedef unsigned char u8; 552 typedef unsigned short u16; 553 typedef unsigned int u32; 554 555 struct 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 }; 563 564 struct ping_result { 565 struct in_addr addr; 566 time_t time; 567 struct ping_result* next; 568 }; 569 570 extern struct daemon { 571 /* datastuctures representing the command-line and 572 config file arguments. All set (including defaults) 573 in option.c */ 574 575 unsigned int options; 576 struct resolvc default_resolv, *resolv_files; 577 time_t last_resolv; 578 struct mx_srv_record* mxnames; 579 struct naptr* naptr; 580 struct txt_record* txt; 581 struct ptr_record* ptr; 582 struct cname* cnames; 583 struct interface_name* int_names; 584 char* mxtarget; 585 char* lease_file; 586 char *username, *groupname, *scriptuser; 587 int group_set, osport; 588 char* domain_suffix; 589 struct cond_domain* cond_domain; 590 char* runfile; 591 char* lease_change_command; 592 struct iname *if_names, *if_addrs, *if_except, *dhcp_except; 593 struct bogus_addr* bogus_addr; 594 struct server* servers; 595 int log_fac; /* log facility */ 596 char* log_file; /* optional log file */ 597 int max_logs; /* queue limit */ 598 int cachesize, ftabsize; 599 int port, query_port, min_port; 600 unsigned long local_ttl, neg_ttl; 601 struct hostsfile* addn_hosts; 602 struct dhcp_context* dhcp; 603 struct dhcp_config* dhcp_conf; 604 struct dhcp_opt *dhcp_opts, *dhcp_match; 605 struct dhcp_vendor* dhcp_vendors; 606 struct dhcp_mac* dhcp_macs; 607 struct dhcp_boot* boot_config; 608 struct pxe_service* pxe_services; 609 int enable_pxe; 610 struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic; 611 char *dhcp_hosts_file, *dhcp_opts_file; 612 int dhcp_max; 613 int dhcp_server_port, dhcp_client_port; 614 unsigned int min_leasetime; 615 struct doctor* doctors; 616 unsigned short edns_pktsz; 617 uint32_t listen_mark; 618 619 /* globally used stuff for DNS */ 620 char* packet; /* packet buffer */ 621 int packet_buff_sz; /* size of above */ 622 char* namebuff; /* MAXDNAME size buffer */ 623 unsigned int local_answer, queries_forwarded; 624 struct frec* frec_list; 625 struct serverfd* sfds; 626 struct irec* interfaces; 627 struct listener* listeners; 628 struct server* last_server; 629 time_t forwardtime; 630 int forwardcount; 631 struct server* srv_save; /* Used for resend on DoD */ 632 size_t packet_len; /* " " */ 633 struct randfd* rfd_save; /* " " */ 634 pid_t tcp_pids[MAX_PROCS]; 635 struct randfd randomsocks[RANDOM_SOCKS]; 636 637 /* DHCP state */ 638 int dhcpfd, helperfd; 639 int netlinkfd; 640 struct iovec dhcp_packet; 641 char *dhcp_buff, *dhcp_buff2; 642 struct ping_result* ping_results; 643 FILE* lease_stream; 644 struct dhcp_bridge* bridges; 645 646 } * daemon; 647 648 /* cache.c */ 649 void cache_init(void); 650 void log_query(unsigned short flags, char* name, struct all_addr* addr, char* arg); 651 char* record_source(int index); 652 void querystr(char* str, unsigned short type); 653 struct crec* cache_find_by_addr(struct crec* crecp, struct all_addr* addr, time_t now, 654 unsigned short prot); 655 struct crec* cache_find_by_name(struct crec* crecp, char* name, time_t now, unsigned short prot); 656 void cache_end_insert(void); 657 void cache_start_insert(void); 658 struct crec* cache_insert(char* name, struct all_addr* addr, time_t now, unsigned long ttl, 659 unsigned short flags); 660 void cache_reload(void); 661 void cache_add_dhcp_entry(char* host_name, struct in_addr* host_address, time_t ttd); 662 void cache_unhash_dhcp(void); 663 void dump_cache(time_t now); 664 char* cache_get_name(struct crec* crecp); 665 char* get_domain(struct in_addr addr); 666 667 /* rfc1035.c */ 668 unsigned short extract_request(HEADER* header, size_t qlen, char* name, unsigned short* typep); 669 size_t setup_reply(HEADER* header, size_t qlen, struct all_addr* addrp, unsigned short flags, 670 unsigned long local_ttl); 671 int extract_addresses(HEADER* header, size_t qlen, char* namebuff, time_t now); 672 size_t answer_request(HEADER* header, char* limit, size_t qlen, struct in_addr local_addr, 673 struct in_addr local_netmask, time_t now); 674 int check_for_bogus_wildcard(HEADER* header, size_t qlen, char* name, struct bogus_addr* addr, 675 time_t now); 676 unsigned char* find_pseudoheader(HEADER* header, size_t plen, size_t* len, unsigned char** p, 677 int* is_sign); 678 int check_for_local_domain(char* name, time_t now); 679 unsigned int questions_crc(HEADER* header, size_t plen, char* buff); 680 size_t resize_packet(HEADER* header, size_t plen, unsigned char* pheader, size_t hlen); 681 682 /* util.c */ 683 void rand_init(void); 684 unsigned short rand16(void); 685 int legal_hostname(char* c); 686 char* canonicalise(char* s, int* nomem); 687 unsigned char* do_rfc1035_name(unsigned char* p, char* sval); 688 void* safe_malloc(size_t size); 689 void safe_pipe(int* fd, int read_noblock); 690 void* whine_malloc(size_t size); 691 int sa_len(union mysockaddr* addr); 692 int sockaddr_isequal(union mysockaddr* s1, union mysockaddr* s2); 693 int hostname_isequal(char* a, char* b); 694 time_t dnsmasq_time(void); 695 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask); 696 int retry_send(void); 697 int parse_addr(int family, const char* addrstr, union mysockaddr* addr); 698 void prettyprint_time(char* buf, unsigned int t); 699 int prettyprint_addr(const union mysockaddr* addr, char* buf); 700 int parse_hex(char* in, unsigned char* out, int maxlen, unsigned int* wildcard_mask, int* mac_type); 701 int memcmp_masked(unsigned char* a, unsigned char* b, int len, unsigned int mask); 702 int expand_buf(struct iovec* iov, size_t size); 703 char* print_mac(char* buff, unsigned char* mac, int len); 704 void bump_maxfd(int fd, int* max); 705 int read_write(int fd, unsigned char* packet, int size, int rw); 706 707 /* log.c */ 708 void die(char* message, char* arg1, int exit_code); 709 int log_start(struct passwd* ent_pw, int errfd); 710 int log_reopen(char* log_file); 711 void my_syslog(int priority, const char* format, ...); 712 void set_log_writer(fd_set* set, int* maxfdp); 713 void check_log_writer(fd_set* set); 714 void flush_log(void); 715 716 /* option.c */ 717 void read_opts(int argc, char** argv, char* compile_opts); 718 char* option_string(unsigned char opt, int* is_ip, int* is_name); 719 void reread_dhcp(void); 720 721 /* forward.c */ 722 void reply_query(int fd, int family, time_t now); 723 void receive_query(struct listener* listen, time_t now); 724 unsigned char* tcp_request(int confd, time_t now, struct in_addr local_addr, struct in_addr netmask); 725 void server_gone(struct server* server); 726 struct frec* get_new_frec(time_t now, int* wait); 727 728 /* network.c */ 729 int indextoname(int fd, int index, char* name); 730 int local_bind(int fd, union mysockaddr* addr, char* intname, uint32_t mark, int is_tcp); 731 int random_sock(int family); 732 void pre_allocate_sfds(void); 733 int reload_servers(char* fname); 734 #ifdef __ANDROID__ 735 int set_servers(const char* servers); 736 void set_interfaces(const char* interfaces); 737 #endif 738 void check_servers(void); 739 int enumerate_interfaces(); 740 struct listener* create_wildcard_listeners(void); 741 struct listener* create_bound_listeners(void); 742 int iface_check(int family, struct all_addr* addr, char* name, int* indexp); 743 int fix_fd(int fd); 744 struct in_addr get_ifaddr(char* intr); 745 746 /* dhcp.c */ 747 #ifdef HAVE_DHCP 748 void dhcp_init(void); 749 void dhcp_packet(time_t now); 750 struct dhcp_context* address_available(struct dhcp_context* context, struct in_addr addr, 751 struct dhcp_netid* netids); 752 struct dhcp_context* narrow_context(struct dhcp_context* context, struct in_addr taddr, 753 struct dhcp_netid* netids); 754 int match_netid(struct dhcp_netid* check, struct dhcp_netid* pool, int negonly); 755 int address_allocate(struct dhcp_context* context, struct in_addr* addrp, unsigned char* hwaddr, 756 int hw_len, struct dhcp_netid* netids, time_t now); 757 int config_has_mac(struct dhcp_config* config, unsigned char* hwaddr, int len, int type); 758 struct dhcp_config* find_config(struct dhcp_config* configs, struct dhcp_context* context, 759 unsigned char* clid, int clid_len, unsigned char* hwaddr, 760 int hw_len, int hw_type, char* hostname); 761 void dhcp_update_configs(struct dhcp_config* configs); 762 void check_dhcp_hosts(int fatal); 763 struct dhcp_config* config_find_by_address(struct dhcp_config* configs, struct in_addr addr); 764 char* strip_hostname(char* hostname); 765 char* host_from_dns(struct in_addr addr); 766 char* get_domain(struct in_addr addr); 767 #endif 768 769 /* lease.c */ 770 #ifdef HAVE_DHCP 771 void lease_update_file(time_t now); 772 void lease_update_dns(); 773 void lease_init(time_t now); 774 struct dhcp_lease* lease_allocate(struct in_addr addr); 775 void lease_set_hwaddr(struct dhcp_lease* lease, unsigned char* hwaddr, unsigned char* clid, 776 int hw_len, int hw_type, int clid_len); 777 void lease_set_hostname(struct dhcp_lease* lease, char* name, int auth); 778 void lease_set_expires(struct dhcp_lease* lease, unsigned int len, time_t now); 779 void lease_set_interface(struct dhcp_lease* lease, int interface); 780 struct dhcp_lease* lease_find_by_client(unsigned char* hwaddr, int hw_len, int hw_type, 781 unsigned char* clid, int clid_len); 782 struct dhcp_lease* lease_find_by_addr(struct in_addr addr); 783 void lease_prune(struct dhcp_lease* target, time_t now); 784 void lease_update_from_configs(void); 785 int do_script_run(time_t now); 786 void rerun_scripts(void); 787 #endif 788 789 /* rfc2131.c */ 790 #ifdef HAVE_DHCP 791 size_t dhcp_reply(struct dhcp_context* context, char* iface_name, int int_index, size_t sz, 792 time_t now, int unicast_dest, int* is_inform); 793 unsigned char* extended_hwaddr(int hwtype, int hwlen, unsigned char* hwaddr, int clid_len, 794 unsigned char* clid, int* len_out); 795 #endif 796 797 /* dnsmasq.c */ 798 #ifdef HAVE_DHCP 799 int make_icmp_sock(void); 800 int icmp_ping(struct in_addr addr); 801 #endif 802 void send_event(int fd, int event, int data); 803 void clear_cache_and_reload(time_t now); 804 805 /* netlink.c */ 806 #ifdef HAVE_LINUX_NETWORK 807 void netlink_init(void); 808 void netlink_multicast(void); 809 #endif 810 811 /* bpf.c or netlink.c */ 812 int iface_enumerate(void* parm, int (*ipv4_callback)(), int (*ipv6_callback)()); 813 814 /* helper.c */ 815 #if defined(HAVE_DHCP) && !defined(NO_FORK) 816 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd); 817 void helper_write(void); 818 void queue_script(int action, struct dhcp_lease* lease, char* hostname, time_t now); 819 int helper_buf_empty(void); 820 #endif 821
