src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2012 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) 2000-2012 Simon Kelley"
  18
  19 #ifndef NO_LARGEFILE
  20 /* Ensure we can use files >2GB (log files may grow this big) */
  21 #  define _LARGEFILE_SOURCE 1
  22 #  define _FILE_OFFSET_BITS 64
  23 #endif
  24
  25 /* Get linux C library versions and define _GNU_SOURCE for kFreeBSD. */
  26 #if defined(__linux__) || defined(__GLIBC__)
  27 #  ifndef __ANDROID__
  28 #      define _GNU_SOURCE
  29 #  endif
  30 #  include <features.h>
  31 #endif
  32
  33 /* Need these defined early */
  34 #if defined(__sun) || defined(__sun__)
  35 #  define _XPG4_2
  36 #  define __EXTENSIONS__
  37 #endif
  38
  39 /* get these before config.h  for IPv6 stuff... */
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42
  43 #ifdef __APPLE__
  44 /* Define before netinet/in.h to select API. OSX Lion onwards. */
  45 #  define __APPLE_USE_RFC_3542
  46 #endif
  47 #include <netinet/in.h>
  48
  49 /* Also needed before config.h. */
  50 #include <getopt.h>
  51
  52 #include "config.h"
  53
  54 typedef unsigned char u8;
  55 typedef unsigned short u16;
  56 typedef unsigned int u32;
  57 typedef unsigned long long u64;
  58
  59 #include "dns-protocol.h"
  60 #include "dhcp-protocol.h"
  61 #ifdef HAVE_DHCP6
  62 #include "dhcp6-protocol.h"
  63 #include "radv-protocol.h"
  64 #endif
  65
  66 #define gettext_noop(S) (S)
  67 #ifndef LOCALEDIR
  68 #  define _(S) (S)
  69 #else
  70 #  include <libintl.h>
  71 #  include <locale.h>
  72 #  define _(S) gettext(S)
  73 #endif
  74
  75 #include <arpa/inet.h>
  76 #include <sys/stat.h>
  77 #include <sys/ioctl.h>
  78 #if defined(HAVE_SOLARIS_NETWORK)
  79 #  include <sys/sockio.h>
  80 #endif
  81 #include <sys/select.h>
  82 #include <sys/wait.h>
  83 #include <sys/time.h>
  84 #include <sys/un.h>
  85 #include <limits.h>
  86 #include <net/if.h>
  87 #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu)
  88 /* Some solaris net/if./h omit this. */
  89 #  define ifr_mtu  ifr_ifru.ifru_metric
  90 #endif
  91 #include <unistd.h>
  92 #include <stdio.h>
  93 #include <string.h>
  94 #include <stdlib.h>
  95 #include <fcntl.h>
  96 #include <ctype.h>
  97 #include <signal.h>
  98 #include <stddef.h>
  99 #include <time.h>
 100 #include <errno.h>
 101 #include <pwd.h>
 102 #include <grp.h>
 103 #include <stdarg.h>
 104 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__)
 105 #  include <netinet/if_ether.h>
 106 #else
 107 #  include <net/ethernet.h>
 108 #endif
 109 #include <net/if_arp.h>
 110 #include <netinet/in_systm.h>
 111 #include <netinet/ip.h>
 112 #include <netinet/ip_icmp.h>
 113 #include <sys/uio.h>
 114 #include <syslog.h>
 115 #include <dirent.h>
 116 #ifndef HAVE_LINUX_NETWORK
 117 #  include <net/if_dl.h>
 118 #endif
 119
 120 #if defined(HAVE_LINUX_NETWORK)
 121 #include <linux/capability.h>
 122 /* There doesn't seem to be a universally-available
 123    userpace header for these. */
 124 extern int capset(cap_user_header_t header, cap_user_data_t data);
 125 extern int capget(cap_user_header_t header, cap_user_data_t data);
 126 #define LINUX_CAPABILITY_VERSION_1  0x19980330
 127 #define LINUX_CAPABILITY_VERSION_2  0x20071026
 128 #define LINUX_CAPABILITY_VERSION_3  0x20080522
 129
 130 #include <sys/prctl.h>
 131 #elif defined(HAVE_SOLARIS_NETWORK)
 132 #include <priv.h>
 133 #endif
 134
 135 /* daemon is function in the C library.... */
 136 #define daemon dnsmasq_daemon
 137
 138 /* Async event queue */
 139 struct event_desc {
 140   int event, data, msg_sz;
 141 };
 142
 143 #define EVENT_RELOAD    1
 144 #define EVENT_DUMP      2
 145 #define EVENT_ALARM     3
 146 #define EVENT_TERM      4
 147 #define EVENT_CHILD     5
 148 #define EVENT_REOPEN    6
 149 #define EVENT_EXITED    7
 150 #define EVENT_KILLED    8
 151 #define EVENT_EXEC_ERR  9
 152 #define EVENT_PIPE_ERR  10
 153 #define EVENT_USER_ERR  11
 154 #define EVENT_CAP_ERR   12
 155 #define EVENT_PIDFILE   13
 156 #define EVENT_HUSER_ERR 14
 157 #define EVENT_GROUP_ERR 15
 158 #define EVENT_DIE       16
 159 #define EVENT_LOG_ERR   17
 160 #define EVENT_FORK_ERR  18
 161 #define EVENT_LUA_ERR   19
 162
 163 /* Exit codes. */
 164 #define EC_GOOD        0
 165 #define EC_BADCONF     1
 166 #define EC_BADNET      2
 167 #define EC_FILE        3
 168 #define EC_NOMEM       4
 169 #define EC_MISC        5
 170 #define EC_INIT_OFFSET 10
 171
 172 /* Min buffer size: we check after adding each record, so there must be
 173    memory for the largest packet, and the largest record so the
 174    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 175    This might be increased is EDNS packet size if greater than the minimum.
 176 */
 177 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 178
 179 /* Trust the compiler dead-code eliminator.... */
 180 #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
 181
 182 #define OPT_BOGUSPRIV      0
 183 #define OPT_FILTER         1
 184 #define OPT_LOG            2
 185 #define OPT_SELFMX         3
 186 #define OPT_NO_HOSTS       4
 187 #define OPT_NO_POLL        5
 188 #define OPT_DEBUG          6
 189 #define OPT_ORDER          7
 190 #define OPT_NO_RESOLV      8
 191 #define OPT_EXPAND         9
 192 #define OPT_LOCALMX        10
 193 #define OPT_NO_NEG         11
 194 #define OPT_NODOTS_LOCAL   12
 195 #define OPT_NOWILD         13
 196 #define OPT_ETHERS         14
 197 #define OPT_RESOLV_DOMAIN  15
 198 #define OPT_NO_FORK        16
 199 #define OPT_AUTHORITATIVE  17
 200 #define OPT_LOCALISE       18
 201 #define OPT_DBUS           19
 202 #define OPT_DHCP_FQDN      20
 203 #define OPT_NO_PING        21
 204 #define OPT_LEASE_RO       22
 205 #define OPT_ALL_SERVERS    23
 206 #define OPT_RELOAD         24
 207 #define OPT_LOCAL_REBIND   25
 208 #define OPT_TFTP_SECURE    26
 209 #define OPT_TFTP_NOBLOCK   27
 210 #define OPT_LOG_OPTS       28
 211 #define OPT_TFTP_APREF     29
 212 #define OPT_NO_OVERRIDE    30
 213 #define OPT_NO_REBIND      31
 214 #define OPT_ADD_MAC        32
 215 #define OPT_DNSSEC         33
 216 #define OPT_CONSEC_ADDR    34
 217 #define OPT_CONNTRACK      35
 218 #define OPT_FQDN_UPDATE    36
 219 #define OPT_RA             37
 220 #define OPT_LAST           38
 221
 222 /* extra flags for my_syslog, we use a couple of facilities since they are known
 223    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 224 #define MS_TFTP LOG_USER
 225 #define MS_DHCP LOG_DAEMON
 226
 227 struct all_addr {
 228   union {
 229     struct in_addr addr4;
 230 #ifdef HAVE_IPV6
 231     struct in6_addr addr6;
 232 #endif
 233   } addr;
 234 };
 235
 236 struct bogus_addr {
 237   struct in_addr addr;
 238   struct bogus_addr *next;
 239 };
 240
 241 /* dns doctor param */
 242 struct doctor {
 243   struct in_addr in, end, out, mask;
 244   struct doctor *next;
 245 };
 246
 247 struct mx_srv_record {
 248   char *name, *target;
 249   int issrv, srvport, priority, weight;
 250   unsigned int offset;
 251   struct mx_srv_record *next;
 252 };
 253
 254 struct naptr {
 255   char *name, *replace, *regexp, *services, *flags;
 256   unsigned int order, pref;
 257   struct naptr *next;
 258 };
 259
 260 struct txt_record {
 261   char *name;
 262   unsigned char *txt;
 263   unsigned short class, len;
 264   struct txt_record *next;
 265 };
 266
 267 struct ptr_record {
 268   char *name, *ptr;
 269   struct ptr_record *next;
 270 };
 271
 272 struct cname {
 273   char *alias, *target;
 274   struct cname *next;
 275 };
 276
 277 struct host_record {
 278   struct name_list {
 279     char *name;
 280     struct name_list *next;
 281   } *names;
 282   struct in_addr addr;
 283 #ifdef HAVE_IPV6
 284   struct in6_addr addr6;
 285 #endif
 286   struct host_record *next;
 287 };
 288
 289 struct interface_name {
 290   char *name; /* domain name */
 291   char *intr; /* interface name */
 292   struct interface_name *next;
 293 };
 294
 295 union bigname {
 296   char name[MAXDNAME];
 297   union bigname *next; /* freelist */
 298 };
 299
 300 struct crec {
 301   struct crec *next, *prev, *hash_next;
 302   time_t ttd; /* time to die */
 303   int uid;
 304   union {
 305     struct all_addr addr;
 306     struct {
 307       struct crec *cache;
 308       int uid;
 309     } cname;
 310   } addr;
 311   unsigned short flags;
 312   union {
 313     char sname[SMALLDNAME];
 314     union bigname *bname;
 315     char *namep;
 316   } name;
 317 };
 318
 319 #define F_IMMORTAL  (1u<<0)
 320 #define F_NAMEP     (1u<<1)
 321 #define F_REVERSE   (1u<<2)
 322 #define F_FORWARD   (1u<<3)
 323 #define F_DHCP      (1u<<4)
 324 #define F_NEG       (1u<<5)
 325 #define F_HOSTS     (1u<<6)
 326 #define F_IPV4      (1u<<7)
 327 #define F_IPV6      (1u<<8)
 328 #define F_BIGNAME   (1u<<9)
 329 #define F_NXDOMAIN  (1u<<10)
 330 #define F_CNAME     (1u<<11)
 331 #define F_NOERR     (1u<<12)
 332 #define F_CONFIG    (1u<<13)
 333 /* below here are only valid as args to log_query: cache
 334    entries are limited to 16 bits */
 335 #define F_UPSTREAM  (1u<<16)
 336 #define F_RRNAME    (1u<<17)
 337 #define F_SERVER    (1u<<18)
 338 #define F_QUERY     (1u<<19)
 339
 340
 341 /* struct sockaddr is not large enough to hold any address,
 342    and specifically not big enough to hold an IPv6 address.
 343    Blech. Roll our own. */
 344 union mysockaddr {
 345   struct sockaddr sa;
 346   struct sockaddr_in in;
 347 #if defined(HAVE_IPV6)
 348   struct sockaddr_in6 in6;
 349 #endif
 350 };
 351
 352 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 353 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 354 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 355 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 356 #define SERV_HAS_SOURCE       16  /* source address defined */
 357 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 358 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 359 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 360 #define SERV_MARK            256  /* for mark-and-delete */
 361 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 362 #define SERV_COUNTED         512  /* workspace for log code */
 363 #define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
 364 #define SERV_NO_REBIND      2048  /* inhibit dns-rebind protection */
 365
 366 struct serverfd {
 367   int fd;
 368   union mysockaddr source_addr;
 369   char interface[IF_NAMESIZE+1];
 370   struct serverfd *next;
 371 };
 372
 373 struct randfd {
 374   int fd;
 375   unsigned short refcount, family;
 376 };
 377
 378 struct server {
 379   union mysockaddr addr, source_addr;
 380   char interface[IF_NAMESIZE+1];
 381   struct serverfd *sfd;
 382   char *domain; /* set if this server only handles a domain. */
 383   int flags, tcpfd;
 384   unsigned int queries, failed_queries;
 385   struct server *next;
 386 };
 387
 388 struct irec {
 389   union mysockaddr addr;
 390   struct in_addr netmask; /* only valid for IPv4 */
 391   int tftp_ok, mtu, done, dad;
 392   char *name;
 393   struct irec *next;
 394 };
 395
 396 struct listener {
 397   int fd, tcpfd, tftpfd, family;
 398   struct irec *iface; /* only valid for non-wildcard */
 399   struct listener *next;
 400 };
 401
 402 /* interface and address parms from command line. */
 403 struct iname {
 404   char *name;
 405   union mysockaddr addr;
 406   int isloop, used;
 407   struct iname *next;
 408 };
 409
 410 /* resolv-file parms from command-line */
 411 struct resolvc {
 412   struct resolvc *next;
 413   int is_default, logged;
 414   time_t mtime;
 415   char *name;
 416 };
 417
 418 /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile */
 419 #define AH_DIR      1
 420 #define AH_INACTIVE 2
 421 struct hostsfile {
 422   struct hostsfile *next;
 423   int flags;
 424   char *fname;
 425   int index; /* matches to cache entries for logging */
 426 };
 427
 428 #define FREC_NOREBIND           1
 429 #define FREC_CHECKING_DISABLED  2
 430
 431 struct frec {
 432   union mysockaddr source;
 433   struct all_addr dest;
 434   struct server *sentto; /* NULL means free */
 435   struct randfd *rfd4;
 436 #ifdef HAVE_IPV6
 437   struct randfd *rfd6;
 438 #endif
 439   unsigned int iface;
 440   unsigned short orig_id, new_id;
 441   int fd, forwardall, flags;
 442   unsigned int crc;
 443   time_t time;
 444   struct frec *next;
 445 };
 446
 447 /* flags in top of length field for DHCP-option tables */
 448 #define OT_ADDR_LIST    0x8000
 449 #define OT_RFC1035_NAME 0x4000
 450 #define OT_INTERNAL     0x2000
 451 #define OT_NAME         0x1000
 452 #define OT_CSTRING      0x0800
 453 #define OT_DEC          0x0400
 454
 455
 456 /* actions in the daemon->helper RPC */
 457 #define ACTION_DEL           1
 458 #define ACTION_OLD_HOSTNAME  2
 459 #define ACTION_OLD           3
 460 #define ACTION_ADD           4
 461
 462 #define LEASE_NEW            1  /* newly created */
 463 #define LEASE_CHANGED        2  /* modified */
 464 #define LEASE_AUX_CHANGED    4  /* CLID or expiry changed */
 465 #define LEASE_AUTH_NAME      8  /* hostname came from config, not from client */
 466 #define LEASE_USED          16  /* used this DHCPv6 transaction */
 467 #define LEASE_NA            32  /* IPv6 no-temporary lease */
 468 #define LEASE_TA            64  /* IPv6 temporary lease */
 469 #define LEASE_HAVE_HWADDR  128  /* Have set hwaddress */
 470
 471 struct dhcp_lease {
 472   int clid_len;          /* length of client identifier */
 473   unsigned char *clid;   /* clientid */
 474   char *hostname, *fqdn; /* name from client-hostname option or config */
 475   char *old_hostname;    /* hostname before it moved to another lease */
 476   int flags;
 477   time_t expires;        /* lease expiry */
 478 #ifdef HAVE_BROKEN_RTC
 479   unsigned int length;
 480 #endif
 481   int hwaddr_len, hwaddr_type; /* hw_type used for iaid in v6 */
 482   unsigned char hwaddr[DHCP_CHADDR_MAX]; /* also IPv6 address */
 483   struct in_addr addr, override, giaddr;
 484   unsigned char *extradata;
 485   unsigned int extradata_len, extradata_size;
 486   int last_interface;
 487 #ifdef HAVE_DHCP6
 488   struct slaac_address {
 489     struct in6_addr addr, local;
 490     time_t ping_time;
 491     int backoff; /* zero -> confirmed */
 492     struct slaac_address *next;
 493   } *slaac_address;
 494 #endif
 495   struct dhcp_lease *next;
 496 };
 497
 498 struct dhcp_netid {
 499   char *net;
 500   struct dhcp_netid *next;
 501 };
 502
 503 struct dhcp_netid_list {
 504   struct dhcp_netid *list;
 505   struct dhcp_netid_list *next;
 506 };
 507
 508 struct tag_if {
 509   struct dhcp_netid_list *set;
 510   struct dhcp_netid *tag;
 511   struct tag_if *next;
 512 };
 513
 514 struct hwaddr_config {
 515   int hwaddr_len, hwaddr_type;
 516   unsigned char hwaddr[DHCP_CHADDR_MAX];
 517   unsigned int wildcard_mask;
 518   struct hwaddr_config *next;
 519 };
 520
 521 struct dhcp_config {
 522   unsigned int flags;
 523   int clid_len;          /* length of client identifier */
 524   unsigned char *clid;   /* clientid */
 525   char *hostname, *domain;
 526   struct dhcp_netid_list *netid;
 527 #ifdef HAVE_DHCP6
 528   struct in6_addr addr6;
 529 #endif
 530   struct in_addr addr;
 531   time_t decline_time;
 532   unsigned int lease_time;
 533   struct hwaddr_config *hwaddr;
 534   struct dhcp_config *next;
 535 };
 536
 537 #define have_config(config, mask) ((config) && ((config)->flags & (mask)))
 538
 539 #define CONFIG_DISABLE           1
 540 #define CONFIG_CLID              2
 541 #define CONFIG_TIME              8
 542 #define CONFIG_NAME             16
 543 #define CONFIG_ADDR             32
 544 #define CONFIG_NOCLID          128
 545 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 546 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 547 #define CONFIG_DECLINED       1024    /* address declined by client */
 548 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 549 #define CONFIG_ADDR6          4096
 550
 551 struct dhcp_opt {
 552   int opt, len, flags;
 553   union {
 554     int encap;
 555     unsigned int wildcard_mask;
 556     unsigned char *vendor_class;
 557   } u;
 558   unsigned char *val;
 559   struct dhcp_netid *netid;
 560   struct dhcp_opt *next;
 561 };
 562
 563 #define DHOPT_ADDR               1
 564 #define DHOPT_STRING             2
 565 #define DHOPT_ENCAPSULATE        4
 566 #define DHOPT_ENCAP_MATCH        8
 567 #define DHOPT_FORCE             16
 568 #define DHOPT_BANK              32
 569 #define DHOPT_ENCAP_DONE        64
 570 #define DHOPT_MATCH            128
 571 #define DHOPT_VENDOR           256
 572 #define DHOPT_HEX              512
 573 #define DHOPT_VENDOR_MATCH    1024
 574 #define DHOPT_RFC3925         2048
 575 #define DHOPT_TAGOK           4096
 576 #define DHOPT_ADDR6           8192
 577
 578 struct dhcp_boot {
 579   char *file, *sname, *tftp_sname;
 580   struct in_addr next_server;
 581   struct dhcp_netid *netid;
 582   struct dhcp_boot *next;
 583 };
 584
 585 struct pxe_service {
 586   unsigned short CSA, type;
 587   char *menu, *basename, *sname;
 588   struct in_addr server;
 589   struct dhcp_netid *netid;
 590   struct pxe_service *next;
 591 };
 592
 593 #define MATCH_VENDOR     1
 594 #define MATCH_USER       2
 595 #define MATCH_CIRCUIT    3
 596 #define MATCH_REMOTE     4
 597 #define MATCH_SUBSCRIBER 5
 598
 599 /* vendorclass, userclass, remote-id or cicuit-id */
 600 struct dhcp_vendor {
 601   int len, match_type;
 602   unsigned int enterprise;
 603   char *data;
 604   struct dhcp_netid netid;
 605   struct dhcp_vendor *next;
 606 };
 607
 608 struct dhcp_mac {
 609   unsigned int mask;
 610   int hwaddr_len, hwaddr_type;
 611   unsigned char hwaddr[DHCP_CHADDR_MAX];
 612   struct dhcp_netid netid;
 613   struct dhcp_mac *next;
 614 };
 615
 616 struct dhcp_bridge {
 617   char iface[IF_NAMESIZE];
 618   struct dhcp_bridge *alias, *next;
 619 };
 620
 621 struct cond_domain {
 622   char *domain;
 623   struct in_addr start, end;
 624 #ifdef HAVE_IPV6
 625   struct in6_addr start6, end6;
 626 #endif
 627   int is6;
 628   struct cond_domain *next;
 629 };
 630
 631 struct dhcp_context {
 632   unsigned int lease_time, addr_epoch;
 633   struct in_addr netmask, broadcast;
 634   struct in_addr local, router;
 635   struct in_addr start, end; /* range of available addresses */
 636 #ifdef HAVE_DHCP6
 637   struct in6_addr start6, end6; /* range of available addresses */
 638   struct in6_addr local6;
 639   int prefix, if_index;
 640   time_t ra_time;
 641 #endif
 642   int flags;
 643   char *interface;
 644   struct dhcp_netid netid, *filter;
 645   struct dhcp_context *next, *current;
 646 };
 647
 648 #define CONTEXT_STATIC    1
 649 #define CONTEXT_NETMASK   2
 650 #define CONTEXT_BRDCAST   4
 651 #define CONTEXT_PROXY     8
 652 #define CONTEXT_RA_ONLY  16
 653 #define CONTEXT_RA_DONE  32
 654 #define CONTEXT_RA_NAME  64
 655
 656 struct ping_result {
 657   struct in_addr addr;
 658   time_t time;
 659   unsigned int hash;
 660   struct ping_result *next;
 661 };
 662
 663 struct tftp_file {
 664   int refcount, fd;
 665   off_t size;
 666   dev_t dev;
 667   ino_t inode;
 668   char filename[];
 669 };
 670
 671 struct tftp_transfer {
 672   int sockfd;
 673   time_t timeout;
 674   int backoff;
 675   unsigned int block, blocksize, expansion;
 676   off_t offset;
 677   union mysockaddr peer;
 678   char opt_blocksize, opt_transize, netascii, carrylf;
 679   struct tftp_file *file;
 680   struct tftp_transfer *next;
 681 };
 682
 683 struct addr_list {
 684   struct in_addr addr;
 685   struct addr_list *next;
 686 };
 687
 688 struct interface_list {
 689   char *interface;
 690   struct interface_list *next;
 691 };
 692
 693 struct tftp_prefix {
 694   char *interface;
 695   char *prefix;
 696   struct tftp_prefix *next;
 697 };
 698
 699
 700 extern struct daemon {
 701   /* datastuctures representing the command-line and
 702      config file arguments. All set (including defaults)
 703      in option.c */
 704
 705   unsigned int options, options2;
 706   struct resolvc default_resolv, *resolv_files;
 707   time_t last_resolv;
 708   struct mx_srv_record *mxnames;
 709   struct naptr *naptr;
 710   struct txt_record *txt;
 711   struct ptr_record *ptr;
 712   struct host_record *host_records, *host_records_tail;
 713   struct cname *cnames;
 714   struct interface_name *int_names;
 715   char *mxtarget;
 716   char *lease_file;
 717   char *username, *groupname, *scriptuser;
 718   char *luascript;
 719   int group_set, osport;
 720   char *domain_suffix;
 721   struct cond_domain *cond_domain;
 722   char *runfile;
 723   char *lease_change_command;
 724   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 725   struct bogus_addr *bogus_addr;
 726   struct server *servers;
 727   int log_fac; /* log facility */
 728   char *log_file; /* optional log file */
 729   int max_logs;  /* queue limit */
 730   int cachesize, ftabsize;
 731   int port, query_port, min_port;
 732   unsigned long local_ttl, neg_ttl, max_ttl;
 733   struct hostsfile *addn_hosts;
 734   struct dhcp_context *dhcp, *dhcp6, *ra_contexts;
 735   struct dhcp_config *dhcp_conf;
 736   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
 737   struct dhcp_vendor *dhcp_vendors;
 738   struct dhcp_mac *dhcp_macs;
 739   struct dhcp_boot *boot_config;
 740   struct pxe_service *pxe_services;
 741   struct tag_if *tag_if;
 742   struct addr_list *override_relays;
 743   int override;
 744   int enable_pxe;
 745   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names;
 746   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
 747   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
 748   int dhcp_max, tftp_max;
 749   int dhcp_server_port, dhcp_client_port;
 750   int start_tftp_port, end_tftp_port;
 751   unsigned int min_leasetime;
 752   struct doctor *doctors;
 753   unsigned short edns_pktsz;
 754   char *tftp_prefix;
 755   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
 756   struct interface_list *tftp_interfaces; /* interfaces for limited TFTP service */
 757   int tftp_unlimited;
 758   unsigned int duid_enterprise, duid_config_len;
 759   unsigned char *duid_config;
 760
 761   /* globally used stuff for DNS */
 762   char *packet; /* packet buffer */
 763   int packet_buff_sz; /* size of above */
 764   char *namebuff; /* MAXDNAME size buffer */
 765   unsigned int local_answer, queries_forwarded;
 766   struct frec *frec_list;
 767   struct serverfd *sfds;
 768   struct irec *interfaces;
 769   struct listener *listeners;
 770   struct server *last_server;
 771   time_t forwardtime;
 772   int forwardcount;
 773   struct server *srv_save; /* Used for resend on DoD */
 774   size_t packet_len;       /*      "        "        */
 775   struct randfd *rfd_save; /*      "        "        */
 776   pid_t tcp_pids[MAX_PROCS];
 777   struct randfd randomsocks[RANDOM_SOCKS];
 778   int v6pktinfo;
 779
 780   /* DHCP state */
 781   int dhcpfd, helperfd, pxefd;
 782 #if defined(HAVE_LINUX_NETWORK)
 783   int netlinkfd;
 784 #elif defined(HAVE_BSD_NETWORK)
 785   int dhcp_raw_fd, dhcp_icmp_fd;
 786 #endif
 787   struct iovec dhcp_packet;
 788   char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
 789   struct ping_result *ping_results;
 790   FILE *lease_stream;
 791   struct dhcp_bridge *bridges;
 792 #ifdef HAVE_DHCP6
 793   int duid_len;
 794   unsigned char *duid;
 795   struct iovec outpacket;
 796   int dhcp6fd, icmp6fd;
 797 #endif
 798   /* DBus stuff */
 799   /* void * here to avoid depending on dbus headers outside dbus.c */
 800   void *dbus;
 801 #ifdef HAVE_DBUS
 802   struct watch *watches;
 803 #endif
 804
 805   /* TFTP stuff */
 806   struct tftp_transfer *tftp_trans;
 807
 808   /* utility string buffer, hold max sized IP address as string */
 809   char *addrbuff;
 810
 811 } *daemon;
 812
 813 /* cache.c */
 814 void cache_init(void);
 815 void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg);
 816 char *record_source(int index);
 817 void querystr(char *str, unsigned short type);
 818 struct crec *cache_find_by_addr(struct crec *crecp,
 819                                 struct all_addr *addr, time_t now,
 820                                 unsigned short prot);
 821 struct crec *cache_find_by_name(struct crec *crecp,
 822                                 char *name, time_t now, unsigned short  prot);
 823 void cache_end_insert(void);
 824 void cache_start_insert(void);
 825 struct crec *cache_insert(char *name, struct all_addr *addr,
 826                           time_t now, unsigned long ttl, unsigned short flags);
 827 void cache_reload(void);
 828 void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
 829 struct in_addr a_record_from_hosts(char *name, time_t now);
 830 void cache_unhash_dhcp(void);
 831 void dump_cache(time_t now);
 832 char *cache_get_name(struct crec *crecp);
 833 char *get_domain(struct in_addr addr);
 834 #ifdef HAVE_IPV6
 835 char *get_domain6(struct in6_addr *addr);
 836 #endif
 837
 838 /* rfc1035.c */
 839 unsigned int extract_request(struct dns_header *header, size_t qlen,
 840                                char *name, unsigned short *typep);
 841 size_t setup_reply(struct dns_header *header, size_t  qlen,
 842                    struct all_addr *addrp, unsigned int flags,
 843                    unsigned long local_ttl);
 844 int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff,
 845                       time_t now, int is_sign, int checkrebind, int checking_disabled);
 846 size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 847                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 848 int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
 849                              struct bogus_addr *addr, time_t now);
 850 unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
 851                                  size_t *len, unsigned char **p, int *is_sign);
 852 int check_for_local_domain(char *name, time_t now);
 853 unsigned int questions_crc(struct dns_header *header, size_t plen, char *buff);
 854 size_t resize_packet(struct dns_header *header, size_t plen,
 855                   unsigned char *pheader, size_t hlen);
 856 size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
 857
 858 /* util.c */
 859 void rand_init(void);
 860 unsigned short rand16(void);
 861 int legal_hostname(char *c);
 862 char *canonicalise(char *s, int *nomem);
 863 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 864 void *safe_malloc(size_t size);
 865 void safe_pipe(int *fd, int read_noblock);
 866 void *whine_malloc(size_t size);
 867 int sa_len(union mysockaddr *addr);
 868 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 869 int hostname_isequal(char *a, char *b);
 870 time_t dnsmasq_time(void);
 871 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 872 #ifdef HAVE_IPV6
 873 int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen);
 874 u64 addr6part(struct in6_addr *addr);
 875 void setaddr6part(struct in6_addr *addr, u64 host);
 876 #endif
 877 int retry_send(void);
 878 void prettyprint_time(char *buf, unsigned int t);
 879 int prettyprint_addr(union mysockaddr *addr, char *buf);
 880 int parse_hex(char *in, unsigned char *out, int maxlen,
 881               unsigned int *wildcard_mask, int *mac_type);
 882 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 883                   unsigned int mask);
 884 int expand_buf(struct iovec *iov, size_t size);
 885 char *print_mac(char *buff, unsigned char *mac, int len);
 886 void bump_maxfd(int fd, int *max);
 887 int read_write(int fd, unsigned char *packet, int size, int rw);
 888
 889 /* log.c */
 890 void die(char *message, char *arg1, int exit_code);
 891 int log_start(struct passwd *ent_pw, int errfd);
 892 int log_reopen(char *log_file);
 893 void my_syslog(int priority, const char *format, ...);
 894 void set_log_writer(fd_set *set, int *maxfdp);
 895 void check_log_writer(fd_set *set);
 896 void flush_log(void);
 897
 898 /* option.c */
 899 void read_opts (int argc, char **argv, char *compile_opts);
 900 char *option_string(int prot, unsigned int opt, unsigned char *val,
 901                     int opt_len, char *buf, int buf_len);
 902 void reread_dhcp(void);
 903 void set_option_bool(unsigned int opt);
 904 struct hostsfile *expand_filelist(struct hostsfile *list);
 905
 906 /* forward.c */
 907 void reply_query(int fd, int family, time_t now);
 908 void receive_query(struct listener *listen, time_t now);
 909 unsigned char *tcp_request(int confd, time_t now,
 910                            union mysockaddr *local_addr, struct in_addr netmask);
 911 void server_gone(struct server *server);
 912 struct frec *get_new_frec(time_t now, int *wait);
 913 void send_from(int fd, int nowild, char *packet, size_t len,
 914                union mysockaddr *to, struct all_addr *source,
 915                unsigned int iface);
 916
 917 /* network.c */
 918 int indextoname(int fd, int index, char *name);
 919 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 920 int random_sock(int family);
 921 void pre_allocate_sfds(void);
 922 int reload_servers(char *fname);
 923 void check_servers(void);
 924 int enumerate_interfaces();
 925 void create_wildcard_listeners(void);
 926 void create_bound_listeners(int die);
 927 int is_dad_listeners(void);
 928 int iface_check(int family, struct all_addr *addr, char *name);
 929 int fix_fd(int fd);
 930 struct in_addr get_ifaddr(char *intr);
 931 #ifdef HAVE_IPV6
 932 int set_ipv6pktinfo(int fd);
 933 #endif
 934
 935 /* dhcp.c */
 936 #ifdef HAVE_DHCP
 937 void dhcp_init(void);
 938 void dhcp_packet(time_t now, int pxe_fd);
 939 struct dhcp_context *address_available(struct dhcp_context *context,
 940                                        struct in_addr addr,
 941                                        struct dhcp_netid *netids);
 942 struct dhcp_context *narrow_context(struct dhcp_context *context,
 943                                     struct in_addr taddr,
 944                                     struct dhcp_netid *netids);
 945 int address_allocate(struct dhcp_context *context,
 946                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 947                      struct dhcp_netid *netids, time_t now);
 948 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 949 struct dhcp_config *find_config(struct dhcp_config *configs,
 950                                 struct dhcp_context *context,
 951                                 unsigned char *clid, int clid_len,
 952                                 unsigned char *hwaddr, int hw_len,
 953                                 int hw_type, char *hostname);
 954 void dhcp_read_ethers(void);
 955 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 956 char *host_from_dns(struct in_addr addr);
 957 #endif
 958
 959 /* lease.c */
 960 #ifdef HAVE_DHCP
 961 void lease_update_file(time_t now);
 962 void lease_update_dns(int force);
 963 void lease_init(time_t now);
 964 struct dhcp_lease *lease4_allocate(struct in_addr addr);
 965 #ifdef HAVE_DHCP6
 966 struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
 967 struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len,
 968                                int lease_type, int iaid, struct in6_addr *addr);
 969 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
 970 u64 lease_find_max_addr6(struct dhcp_context *context);
 971 void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
 972 #endif
 973 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 974                       unsigned char *clid, int hw_len, int hw_type, int clid_len, time_t now);
 975 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth, char *domain, char *config_domain);
 976 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
 977 void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now);
 978 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
 979                                         unsigned char *clid, int clid_len);
 980 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
 981 struct in_addr lease_find_max_addr(struct dhcp_context *context);
 982 void lease_prune(struct dhcp_lease *target, time_t now);
 983 void lease_update_from_configs(void);
 984 int do_script_run(time_t now);
 985 void rerun_scripts(void);
 986 void lease_find_interfaces(time_t now);
 987 #ifdef HAVE_SCRIPT
 988 void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
 989                          unsigned int len, int delim);
 990 #endif
 991 #endif
 992
 993 /* rfc2131.c */
 994 #ifdef HAVE_DHCP
 995 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 996                   size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe_fd, struct in_addr fallback);
 997 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
 998                                int clid_len, unsigned char *clid, int *len_out);
 999 #endif
1000
1001 /* dnsmasq.c */
1002 #ifdef HAVE_DHCP
1003 int make_icmp_sock(void);
1004 int icmp_ping(struct in_addr addr);
1005 #endif
1006 void send_alarm(time_t event, time_t now);
1007 void send_event(int fd, int event, int data, char *msg);
1008 void clear_cache_and_reload(time_t now);
1009 void poll_resolv(int force, int do_reload, time_t now);
1010
1011 /* netlink.c */
1012 #ifdef HAVE_LINUX_NETWORK
1013 void netlink_init(void);
1014 void netlink_multicast(void);
1015 #endif
1016
1017 /* bpf.c */
1018 #ifdef HAVE_BSD_NETWORK
1019 void init_bpf(void);
1020 void send_via_bpf(struct dhcp_packet *mess, size_t len,
1021                   struct in_addr iface_addr, struct ifreq *ifr);
1022 #endif
1023
1024 /* bpf.c or netlink.c */
1025 int iface_enumerate(int family, void *parm, int (callback)());
1026
1027 /* dbus.c */
1028 #ifdef HAVE_DBUS
1029 char *dbus_init(void);
1030 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
1031 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
1032 #  ifdef HAVE_DHCP
1033 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
1034 #  endif
1035 #endif
1036
1037 /* helper.c */
1038 #if defined(HAVE_SCRIPT)
1039 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
1040 void helper_write(void);
1041 void queue_script(int action, struct dhcp_lease *lease,
1042                   char *hostname, time_t now);
1043 int helper_buf_empty(void);
1044 #endif
1045
1046 /* tftp.c */
1047 #ifdef HAVE_TFTP
1048 void tftp_request(struct listener *listen, time_t now);
1049 void check_tftp_listeners(fd_set *rset, time_t now);
1050 #endif
1051
1052 /* conntrack.c */
1053 #ifdef HAVE_CONNTRACK
1054 int get_incoming_mark(union mysockaddr *peer_addr, struct all_addr *local_addr,
1055                       int istcp, unsigned int *markp);
1056 #endif
1057
1058 /* dhcp6.c */
1059 #ifdef HAVE_DHCP6
1060 void dhcp6_init(void);
1061 void dhcp6_packet(time_t now);
1062 int address6_allocate(struct dhcp_context *context,  unsigned char *clid, int clid_len,
1063                       int serial, struct dhcp_netid *netids, struct in6_addr *ans);
1064 struct dhcp_context *address6_available(struct dhcp_context *context,
1065                                         struct in6_addr *taddr,
1066                                         struct dhcp_netid *netids);
1067 struct dhcp_context *narrow_context6(struct dhcp_context *context,
1068                                      struct in6_addr *taddr,
1069                                      struct dhcp_netid *netids);
1070 struct dhcp_config *find_config6(struct dhcp_config *configs,
1071                                  struct dhcp_context *context,
1072                                  unsigned char *duid, int duid_len,
1073                                  char *hostname);
1074 struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
1075                                             int prefix, u64 addr);
1076 void make_duid(time_t now);
1077 #endif
1078
1079 /* rfc3315.c */
1080 #ifdef HAVE_DHCP6
1081 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
1082                            struct in6_addr *fallback, size_t sz, int is_multicast, time_t now);
1083 #endif
1084
1085 /* dhcp-common.c */
1086 #ifdef HAVE_DHCP
1087 void dhcp_common_init(void);
1088 ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
1089 struct dhcp_netid *run_tag_if(struct dhcp_netid *input);
1090 struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
1091                                  struct dhcp_opt *opts);
1092 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);
1093 char *strip_hostname(char *hostname);
1094 void log_tags(struct dhcp_netid *netid, u32 xid);
1095 int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
1096 void dhcp_update_configs(struct dhcp_config *configs);
1097 void check_dhcp_hosts(int fatal);
1098 void display_opts(void);
1099 u16 lookup_dhcp_opt(int prot, char *name);
1100 u16 lookup_dhcp_len(int prot, u16 val);
1101 char *option_string(int prot, unsigned int opt, unsigned char *val,
1102                     int opt_len, char *buf, int buf_len);
1103 #  ifdef HAVE_DHCP6
1104 void display_opts6(void);
1105 void join_multicast(void);
1106 #  endif
1107 #endif
1108
1109 /* outpacket.c */
1110 #ifdef HAVE_DHCP6
1111 void end_opt6(int container);
1112 int save_counter(int newval);
1113 void *expand(size_t headroom);
1114 int new_opt6(int opt);
1115 void *put_opt6(void *data, size_t len);
1116 void put_opt6_long(unsigned int val);
1117 void put_opt6_short(unsigned int val);
1118 void put_opt6_char(unsigned int val);
1119 void put_opt6_string(char *s);
1120 #endif
1121
1122 /* radv.c */
1123 #ifdef HAVE_DHCP6
1124 void ra_init(time_t now);
1125 void icmp6_packet(void);
1126 time_t periodic_ra(time_t now);
1127 void ra_start_unsolicted(time_t now, struct dhcp_context *context);
1128 #endif
1129
1130 /* slaac.c */
1131 #ifdef HAVE_DHCP6
1132 void build_subnet_map(void);
1133 void slaac_add_addrs(struct dhcp_lease *lease, time_t now);
1134 time_t periodic_slaac(time_t now, struct dhcp_lease *leases);
1135 void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases);
1136 void schedule_subnet_map(void);
1137 #endif