release/src/router/dnsmasq/src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2009 Simon Kelley
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; version 2 dated June, 1991, or
   6    (at your option) version 3 dated 29 June, 2007.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16
  17 #define COPYRIGHT "Copyright (C) 2000-2009 Simon Kelley"
  18
  19 #ifndef NO_LARGEFILE
  20 /* Ensure we can use files >2GB (log files may grow this big) */
  21 #  define _LARGEFILE_SOURCE 1
  22 #  define _FILE_OFFSET_BITS 64
  23 #endif
  24
  25 /* Get linux C library versions. */
  26 #ifdef __linux__
  27 #  define _GNU_SOURCE
  28 #  include <features.h>
  29 #endif
  30
  31 /* get these before config.h  for IPv6 stuff... */
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #include <netinet/in.h>
  35
  36 #ifdef __APPLE__
  37 #  include <nameser.h>
  38 #  include <arpa/nameser_compat.h>
  39 #else
  40 #  include <arpa/nameser.h>
  41 #endif
  42
  43 /* and this. */
  44 #include <getopt.h>
  45
  46 #include "config.h"
  47
  48 #define gettext_noop(S) (S)
  49 #ifndef LOCALEDIR
  50 #  define _(S) (S)
  51 #else
  52 #  include <libintl.h>
  53 #  include <locale.h>
  54 #  define _(S) gettext(S)
  55 #endif
  56
  57 #include <arpa/inet.h>
  58 #include <sys/stat.h>
  59 #include <sys/ioctl.h>
  60 #if defined(HAVE_SOLARIS_NETWORK)
  61 #include <sys/sockio.h>
  62 #endif
  63 #include <sys/select.h>
  64 #include <sys/wait.h>
  65 #include <sys/time.h>
  66 #include <sys/un.h>
  67 #include <limits.h>
  68 #include <net/if.h>
  69 #include <unistd.h>
  70 #include <stdio.h>
  71 #include <string.h>
  72 #include <stdlib.h>
  73 #include <fcntl.h>
  74 #include <ctype.h>
  75 #include <signal.h>
  76 #include <stddef.h>
  77 #include <time.h>
  78 #include <errno.h>
  79 #include <pwd.h>
  80 #include <grp.h>
  81 #include <stdarg.h>
  82 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun)
  83 #  include <netinet/if_ether.h>
  84 #else
  85 #  include <net/ethernet.h>
  86 #endif
  87 #include <net/if_arp.h>
  88 #include <netinet/in_systm.h>
  89 #include <netinet/ip.h>
  90 #include <netinet/ip_icmp.h>
  91 #include <sys/uio.h>
  92 #include <syslog.h>
  93 #include <dirent.h>
  94 #ifndef HAVE_LINUX_NETWORK
  95 #  include <net/if_dl.h>
  96 #endif
  97
  98 #if defined(HAVE_LINUX_NETWORK)
  99 #include <linux/capability.h>
 100 /* There doesn't seem to be a universally-available
 101    userpace header for these. */
 102 extern int capset(cap_user_header_t header, cap_user_data_t data);
 103 extern int capget(cap_user_header_t header, cap_user_data_t data);
 104 #define LINUX_CAPABILITY_VERSION_1  0x19980330
 105 #define LINUX_CAPABILITY_VERSION_2  0x20071026
 106 #define LINUX_CAPABILITY_VERSION_3  0x20080522
 107
 108 #include <linux/prctl.h>
 109 #elif defined(HAVE_SOLARIS_NETWORK)
 110 #include <priv.h>
 111 #endif
 112
 113 /* daemon is function in the C library.... */
 114 #define daemon dnsmasq_daemon
 115
 116 /* Async event queue */
 117 struct event_desc {
 118   int event, data;
 119 };
 120
 121 #define EVENT_RELOAD    1
 122 #define EVENT_DUMP      2
 123 #define EVENT_ALARM     3
 124 #define EVENT_TERM      4
 125 #define EVENT_CHILD     5
 126 #define EVENT_REOPEN    6
 127 #define EVENT_EXITED    7
 128 #define EVENT_KILLED    8
 129 #define EVENT_EXEC_ERR  9
 130 #define EVENT_PIPE_ERR  10
 131 #define EVENT_USER_ERR  11
 132 #define EVENT_CAP_ERR   12
 133 #define EVENT_PIDFILE   13
 134 #define EVENT_HUSER_ERR 14
 135 #define EVENT_GROUP_ERR 15
 136 #define EVENT_DIE       16
 137 #define EVENT_LOG_ERR   17
 138 #define EVENT_FORK_ERR  18
 139
 140 /* Exit codes. */
 141 #define EC_GOOD        0
 142 #define EC_BADCONF     1
 143 #define EC_BADNET      2
 144 #define EC_FILE        3
 145 #define EC_NOMEM       4
 146 #define EC_MISC        5
 147 #define EC_INIT_OFFSET 10
 148
 149 /* Min buffer size: we check after adding each record, so there must be
 150    memory for the largest packet, and the largest record so the
 151    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 152    This might be increased is EDNS packet size if greater than the minimum.
 153 */
 154 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 155
 156 #define OPT_BOGUSPRIV      (1u<<0)
 157 #define OPT_FILTER         (1u<<1)
 158 #define OPT_LOG            (1u<<2)
 159 #define OPT_SELFMX         (1u<<3)
 160 #define OPT_NO_HOSTS       (1u<<4)
 161 #define OPT_NO_POLL        (1u<<5)
 162 #define OPT_DEBUG          (1u<<6)
 163 #define OPT_ORDER          (1u<<7)
 164 #define OPT_NO_RESOLV      (1u<<8)
 165 #define OPT_EXPAND         (1u<<9)
 166 #define OPT_LOCALMX        (1u<<10)
 167 #define OPT_NO_NEG         (1u<<11)
 168 #define OPT_NODOTS_LOCAL   (1u<<12)
 169 #define OPT_NOWILD         (1u<<13)
 170 #define OPT_ETHERS         (1u<<14)
 171 #define OPT_RESOLV_DOMAIN  (1u<<15)
 172 #define OPT_NO_FORK        (1u<<16)
 173 #define OPT_AUTHORITATIVE  (1u<<17)
 174 #define OPT_LOCALISE       (1u<<18)
 175 #define OPT_DBUS           (1u<<19)
 176 #define OPT_DHCP_FQDN      (1u<<20)
 177 #define OPT_NO_PING        (1u<<21)
 178 #define OPT_LEASE_RO       (1u<<22)
 179 #define OPT_ALL_SERVERS    (1u<<23)
 180 #define OPT_RELOAD         (1u<<24)
 181 #define OPT_TFTP           (1u<<25)
 182 #define OPT_TFTP_SECURE    (1u<<26)
 183 #define OPT_TFTP_NOBLOCK   (1u<<27)
 184 #define OPT_LOG_OPTS       (1u<<28)
 185 #define OPT_TFTP_APREF     (1u<<29)
 186 #define OPT_NO_OVERRIDE    (1u<<30)
 187 #define OPT_NO_REBIND      (1u<<31)
 188
 189 /* extra flags for my_syslog, we use a couple of facilities since they are known
 190    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
 191 #define MS_TFTP LOG_USER
 192 #define MS_DHCP LOG_DAEMON
 193
 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 };
 319
 320 struct randfd {
 321   int fd;
 322   unsigned short refcount, family;
 323 };
 324
 325 struct server {
 326   union mysockaddr addr, source_addr;
 327   char interface[IF_NAMESIZE+1];
 328   struct serverfd *sfd;
 329   char *domain; /* set if this server only handles a domain. */
 330   int flags, tcpfd;
 331   unsigned int queries, failed_queries;
 332   struct server *next;
 333 };
 334
 335 struct irec {
 336   union mysockaddr addr;
 337   struct in_addr netmask; /* only valid for IPv4 */
 338   int dhcp_ok, mtu;
 339   struct irec *next;
 340 };
 341
 342 struct listener {
 343   int fd, tcpfd, tftpfd, family;
 344   struct irec *iface; /* only valid for non-wildcard */
 345   struct listener *next;
 346 };
 347
 348 /* interface and address parms from command line. */
 349 struct iname {
 350   char *name;
 351   union mysockaddr addr;
 352   int isloop, used;
 353   struct iname *next;
 354 };
 355
 356 /* resolv-file parms from command-line */
 357 struct resolvc {
 358   struct resolvc *next;
 359   int is_default, logged;
 360   time_t mtime;
 361   char *name;
 362 };
 363
 364 /* adn-hosts parms from command-line */
 365 #define AH_DIR      1
 366 #define AH_INACTIVE 2
 367 struct hostsfile {
 368   struct hostsfile *next;
 369   int flags;
 370   char *fname;
 371   int index; /* matches to cache entries for logging */
 372 };
 373
 374 struct frec {
 375   union mysockaddr source;
 376   struct all_addr dest;
 377   struct server *sentto; /* NULL means free */
 378   struct randfd *rfd4;
 379 #ifdef HAVE_IPV6
 380   struct randfd *rfd6;
 381 #endif
 382   unsigned int iface;
 383   unsigned short orig_id, new_id;
 384   int fd, forwardall;
 385   unsigned int crc;
 386   time_t time;
 387   struct frec *next;
 388 };
 389
 390 /* actions in the daemon->helper RPC */
 391 #define ACTION_DEL           1
 392 #define ACTION_OLD_HOSTNAME  2
 393 #define ACTION_OLD           3
 394 #define ACTION_ADD           4
 395
 396 #define DHCP_CHADDR_MAX 16
 397
 398 struct dhcp_lease {
 399   int clid_len;          /* length of client identifier */
 400   unsigned char *clid;   /* clientid */
 401   char *hostname, *fqdn; /* name from client-hostname option or config */
 402   char *old_hostname;    /* hostname before it moved to another lease */
 403   char auth_name;        /* hostname came from config, not from client */
 404   char new;              /* newly created */
 405   char changed;          /* modified */
 406   char aux_changed;      /* CLID or expiry changed */
 407   time_t expires;        /* lease expiry */
 408 #ifdef HAVE_BROKEN_RTC
 409   unsigned int length;
 410 #endif
 411   int hwaddr_len, hwaddr_type;
 412   unsigned char hwaddr[DHCP_CHADDR_MAX];
 413   struct in_addr addr, override, giaddr;
 414   unsigned char *vendorclass, *userclass, *supplied_hostname;
 415   unsigned int vendorclass_len, userclass_len, supplied_hostname_len;
 416   int last_interface;
 417   struct dhcp_lease *next;
 418 };
 419
 420 struct dhcp_netid {
 421   char *net;
 422   struct dhcp_netid *next;
 423 };
 424
 425 struct dhcp_netid_list {
 426   struct dhcp_netid *list;
 427   struct dhcp_netid_list *next;
 428 };
 429
 430 struct hwaddr_config {
 431   int hwaddr_len, hwaddr_type;
 432   unsigned char hwaddr[DHCP_CHADDR_MAX];
 433   unsigned int wildcard_mask;
 434   struct hwaddr_config *next;
 435 };
 436
 437 struct dhcp_config {
 438   unsigned int flags;
 439   int clid_len;          /* length of client identifier */
 440   unsigned char *clid;   /* clientid */
 441   char *hostname, *domain;
 442   struct dhcp_netid netid;
 443   struct in_addr addr;
 444   time_t decline_time;
 445   unsigned int lease_time;
 446   struct hwaddr_config *hwaddr;
 447   struct dhcp_config *next;
 448 };
 449
 450 #define CONFIG_DISABLE           1
 451 #define CONFIG_CLID              2
 452 #define CONFIG_TIME              8
 453 #define CONFIG_NAME             16
 454 #define CONFIG_ADDR             32
 455 #define CONFIG_NETID            64
 456 #define CONFIG_NOCLID          128
 457 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
 458 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 459 #define CONFIG_DECLINED       1024    /* address declined by client */
 460 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 461
 462 struct dhcp_opt {
 463   int opt, len, flags;
 464   union {
 465     int encap;
 466     unsigned int wildcard_mask;
 467     unsigned char *vendor_class;
 468   } u;
 469   unsigned char *val;
 470   struct dhcp_netid *netid;
 471   struct dhcp_opt *next;
 472 };
 473
 474 #define DHOPT_ADDR               1
 475 #define DHOPT_STRING             2
 476 #define DHOPT_ENCAPSULATE        4
 477 #define DHOPT_ENCAP_MATCH        8
 478 #define DHOPT_FORCE             16
 479 #define DHOPT_BANK              32
 480 #define DHOPT_ENCAP_DONE        64
 481 #define DHOPT_MATCH            128
 482 #define DHOPT_VENDOR           256
 483 #define DHOPT_HEX              512
 484 #define DHOPT_VENDOR_MATCH    1024
 485
 486 struct dhcp_boot {
 487   char *file, *sname;
 488   struct in_addr next_server;
 489   struct dhcp_netid *netid;
 490   struct dhcp_boot *next;
 491 };
 492
 493 struct pxe_service {
 494   unsigned short CSA, type;
 495   char *menu, *basename;
 496   struct in_addr server;
 497   struct dhcp_netid *netid;
 498   struct pxe_service *next;
 499 };
 500
 501 #define MATCH_VENDOR     1
 502 #define MATCH_USER       2
 503 #define MATCH_CIRCUIT    3
 504 #define MATCH_REMOTE     4
 505 #define MATCH_SUBSCRIBER 5
 506
 507 /* vendorclass, userclass, remote-id or cicuit-id */
 508 struct dhcp_vendor {
 509   int len, match_type, option;
 510   char *data;
 511   struct dhcp_netid netid;
 512   struct dhcp_vendor *next;
 513 };
 514
 515 struct dhcp_mac {
 516   unsigned int mask;
 517   int hwaddr_len, hwaddr_type;
 518   unsigned char hwaddr[DHCP_CHADDR_MAX];
 519   struct dhcp_netid netid;
 520   struct dhcp_mac *next;
 521 };
 522
 523 struct dhcp_bridge {
 524   char iface[IF_NAMESIZE];
 525   struct dhcp_bridge *alias, *next;
 526 };
 527
 528 struct cond_domain {
 529   char *domain;
 530   struct in_addr start, end;
 531   struct cond_domain *next;
 532 };
 533
 534 struct dhcp_context {
 535   unsigned int lease_time, addr_epoch;
 536   struct in_addr netmask, broadcast;
 537   struct in_addr local, router;
 538   struct in_addr start, end; /* range of available addresses */
 539   int flags;
 540   struct dhcp_netid netid, *filter;
 541   struct dhcp_context *next, *current;
 542 };
 543
 544 #define CONTEXT_STATIC    1
 545 #define CONTEXT_NETMASK   2
 546 #define CONTEXT_BRDCAST   4
 547 #define CONTEXT_PROXY     8
 548
 549
 550 typedef unsigned char u8;
 551 typedef unsigned short u16;
 552 typedef unsigned int u32;
 553
 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 struct tftp_file {
 571   int refcount, fd;
 572   off_t size;
 573   dev_t dev;
 574   ino_t inode;
 575   char filename[];
 576 };
 577
 578 struct tftp_transfer {
 579   int sockfd;
 580   time_t timeout;
 581   int backoff;
 582   unsigned int block, blocksize, expansion;
 583   off_t offset;
 584   struct sockaddr_in peer;
 585   char opt_blocksize, opt_transize, netascii, carrylf;
 586   struct tftp_file *file;
 587   struct tftp_transfer *next;
 588 };
 589
 590 extern struct daemon {
 591   /* datastuctures representing the command-line and
 592      config file arguments. All set (including defaults)
 593      in option.c */
 594
 595   unsigned int options;
 596   struct resolvc default_resolv, *resolv_files;
 597   time_t last_resolv;
 598   struct mx_srv_record *mxnames;
 599   struct naptr *naptr;
 600   struct txt_record *txt;
 601   struct ptr_record *ptr;
 602   struct cname *cnames;
 603   struct interface_name *int_names;
 604   char *mxtarget;
 605   char *lease_file;
 606   char *username, *groupname, *scriptuser;
 607   int group_set, osport;
 608   char *domain_suffix;
 609   struct cond_domain *cond_domain;
 610   char *runfile;
 611   char *lease_change_command;
 612   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 613   struct bogus_addr *bogus_addr;
 614   struct server *servers;
 615   int log_fac; /* log facility */
 616   char *log_file; /* optional log file */
 617   int max_logs;  /* queue limit */
 618   int cachesize, ftabsize;
 619   int port, query_port, min_port;
 620   unsigned long local_ttl, neg_ttl;
 621   struct hostsfile *addn_hosts;
 622   struct dhcp_context *dhcp;
 623   struct dhcp_config *dhcp_conf;
 624   struct dhcp_opt *dhcp_opts, *dhcp_match;
 625   struct dhcp_vendor *dhcp_vendors;
 626   struct dhcp_mac *dhcp_macs;
 627   struct dhcp_boot *boot_config;
 628   struct pxe_service *pxe_services;
 629   int enable_pxe;
 630   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic;
 631   char *dhcp_hosts_file, *dhcp_opts_file;
 632   int dhcp_max, tftp_max;
 633   int dhcp_server_port, dhcp_client_port;
 634   int start_tftp_port, end_tftp_port;
 635   unsigned int min_leasetime;
 636   struct doctor *doctors;
 637   unsigned short edns_pktsz;
 638   char *tftp_prefix;
 639
 640   /* globally used stuff for DNS */
 641   char *packet; /* packet buffer */
 642   int packet_buff_sz; /* size of above */
 643   char *namebuff; /* MAXDNAME size buffer */
 644   unsigned int local_answer, queries_forwarded;
 645   struct frec *frec_list;
 646   struct serverfd *sfds;
 647   struct irec *interfaces;
 648   struct listener *listeners;
 649   struct server *last_server;
 650   time_t forwardtime;
 651   int forwardcount;
 652   struct server *srv_save; /* Used for resend on DoD */
 653   size_t packet_len;       /*      "        "        */
 654   struct randfd *rfd_save; /*      "        "        */
 655   pid_t tcp_pids[MAX_PROCS];
 656   struct randfd randomsocks[RANDOM_SOCKS];
 657
 658   /* DHCP state */
 659   int dhcpfd, helperfd;
 660 #if defined(HAVE_LINUX_NETWORK)
 661   int netlinkfd;
 662 #elif defined(HAVE_BSD_NETWORK)
 663   int dhcp_raw_fd, dhcp_icmp_fd;
 664 #endif
 665   struct iovec dhcp_packet;
 666   char *dhcp_buff, *dhcp_buff2;
 667   struct ping_result *ping_results;
 668   FILE *lease_stream;
 669   struct dhcp_bridge *bridges;
 670
 671   /* DBus stuff */
 672   /* void * here to avoid depending on dbus headers outside dbus.c */
 673   void *dbus;
 674 #ifdef HAVE_DBUS
 675   struct watch *watches;
 676 #endif
 677
 678   /* TFTP stuff */
 679   struct tftp_transfer *tftp_trans;
 680
 681 } *daemon;
 682
 683 /* cache.c */
 684 void cache_init(void);
 685 void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg);
 686 char *record_source(int index);
 687 void querystr(char *str, unsigned short type);
 688 struct crec *cache_find_by_addr(struct crec *crecp,
 689                                 struct all_addr *addr, time_t now,
 690                                 unsigned short prot);
 691 struct crec *cache_find_by_name(struct crec *crecp,
 692                                 char *name, time_t now, unsigned short  prot);
 693 void cache_end_insert(void);
 694 void cache_start_insert(void);
 695 struct crec *cache_insert(char *name, struct all_addr *addr,
 696                           time_t now, unsigned long ttl, unsigned short flags);
 697 void cache_reload(void);
 698 void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd);
 699 void cache_unhash_dhcp(void);
 700 void dump_cache(time_t now);
 701 char *cache_get_name(struct crec *crecp);
 702 char *get_domain(struct in_addr addr);
 703
 704 /* rfc1035.c */
 705 unsigned short extract_request(HEADER *header, size_t qlen,
 706                                char *name, unsigned short *typep);
 707 size_t setup_reply(HEADER *header, size_t  qlen,
 708                    struct all_addr *addrp, unsigned short flags,
 709                    unsigned long local_ttl);
 710 int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now);
 711 size_t answer_request(HEADER *header, char *limit, size_t qlen,
 712                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 713 int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name,
 714                              struct bogus_addr *addr, time_t now);
 715 unsigned char *find_pseudoheader(HEADER *header, size_t plen,
 716                                  size_t *len, unsigned char **p, int *is_sign);
 717 int check_for_local_domain(char *name, time_t now);
 718 unsigned int questions_crc(HEADER *header, size_t plen, char *buff);
 719 size_t resize_packet(HEADER *header, size_t plen,
 720                   unsigned char *pheader, size_t hlen);
 721
 722 /* util.c */
 723 void rand_init(void);
 724 unsigned short rand16(void);
 725 int legal_hostname(char *c);
 726 char *canonicalise(char *s, int *nomem);
 727 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 728 void *safe_malloc(size_t size);
 729 void safe_pipe(int *fd, int read_noblock);
 730 void *whine_malloc(size_t size);
 731 int sa_len(union mysockaddr *addr);
 732 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 733 int hostname_isequal(char *a, char *b);
 734 time_t dnsmasq_time(void);
 735 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 736 int retry_send(void);
 737 void prettyprint_time(char *buf, unsigned int t);
 738 int prettyprint_addr(union mysockaddr *addr, char *buf);
 739 int parse_hex(char *in, unsigned char *out, int maxlen,
 740               unsigned int *wildcard_mask, int *mac_type);
 741 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 742                   unsigned int mask);
 743 int expand_buf(struct iovec *iov, size_t size);
 744 char *print_mac(char *buff, unsigned char *mac, int len);
 745 void bump_maxfd(int fd, int *max);
 746 int read_write(int fd, unsigned char *packet, int size, int rw);
 747
 748 /* log.c */
 749 void die(char *message, char *arg1, int exit_code);
 750 int log_start(struct passwd *ent_pw, int errfd);
 751 int log_reopen(char *log_file);
 752 void my_syslog(int priority, const char *format, ...);
 753 void set_log_writer(fd_set *set, int *maxfdp);
 754 void check_log_writer(fd_set *set);
 755 void flush_log(void);
 756
 757 /* option.c */
 758 void read_opts (int argc, char **argv, char *compile_opts);
 759 char *option_string(unsigned char opt, int *is_ip, int *is_name);
 760 void reread_dhcp(void);
 761
 762 /* forward.c */
 763 void reply_query(int fd, int family, time_t now);
 764 void receive_query(struct listener *listen, time_t now);
 765 unsigned char *tcp_request(int confd, time_t now,
 766                            struct in_addr local_addr, struct in_addr netmask);
 767 void server_gone(struct server *server);
 768 struct frec *get_new_frec(time_t now, int *wait);
 769
 770 /* network.c */
 771 int indextoname(int fd, int index, char *name);
 772 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 773 int random_sock(int family);
 774 void pre_allocate_sfds(void);
 775 int reload_servers(char *fname);
 776 void check_servers(void);
 777 int enumerate_interfaces();
 778 struct listener *create_wildcard_listeners(void);
 779 struct listener *create_bound_listeners(void);
 780 int iface_check(int family, struct all_addr *addr, char *name, int *indexp);
 781 int fix_fd(int fd);
 782 struct in_addr get_ifaddr(char *intr);
 783
 784 /* dhcp.c */
 785 #ifdef HAVE_DHCP
 786 void dhcp_init(void);
 787 void dhcp_packet(time_t now);
 788 struct dhcp_context *address_available(struct dhcp_context *context,
 789                                        struct in_addr addr,
 790                                        struct dhcp_netid *netids);
 791 struct dhcp_context *narrow_context(struct dhcp_context *context,
 792                                     struct in_addr taddr,
 793                                     struct dhcp_netid *netids);
 794 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context,
 795                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 796                      struct dhcp_netid *netids, time_t now);
 797 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 798 struct dhcp_config *find_config(struct dhcp_config *configs,
 799                                 struct dhcp_context *context,
 800                                 unsigned char *clid, int clid_len,
 801                                 unsigned char *hwaddr, int hw_len,
 802                                 int hw_type, char *hostname);
 803 void dhcp_update_configs(struct dhcp_config *configs);
 804 void dhcp_read_ethers(void);
 805 void check_dhcp_hosts(int fatal);
 806 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 807 char *strip_hostname(char *hostname);
 808 char *host_from_dns(struct in_addr addr);
 809 char *get_domain(struct in_addr addr);
 810 #endif
 811
 812 /* lease.c */
 813 #ifdef HAVE_DHCP
 814 void lease_update_file(time_t now);
 815 void lease_update_dns();
 816 void lease_init(time_t now);
 817 struct dhcp_lease *lease_allocate(struct in_addr addr);
 818 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 819                       unsigned char *clid, int hw_len, int hw_type, int clid_len);
 820 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth);
 821 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
 822 void lease_set_interface(struct dhcp_lease *lease, int interface);
 823 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
 824                                         unsigned char *clid, int clid_len);
 825 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
 826 void lease_prune(struct dhcp_lease *target, time_t now);
 827 void lease_update_from_configs(void);
 828 int do_script_run(time_t now);
 829 void rerun_scripts(void);
 830 #endif
 831
 832 /* rfc2131.c */
 833 #ifdef HAVE_DHCP
 834 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 835                   size_t sz, time_t now, int unicast_dest, int *is_inform);
 836 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
 837                                int clid_len, unsigned char *clid, int *len_out);
 838 #endif
 839
 840 /* dnsmasq.c */
 841 #ifdef HAVE_DHCP
 842 int make_icmp_sock(void);
 843 int icmp_ping(struct in_addr addr);
 844 #endif
 845 void send_event(int fd, int event, int data);
 846 void clear_cache_and_reload(time_t now);
 847
 848 /* netlink.c */
 849 #ifdef HAVE_LINUX_NETWORK
 850 void netlink_init(void);
 851 void netlink_multicast(void);
 852 #endif
 853
 854 /* bpf.c */
 855 #ifdef HAVE_BSD_NETWORK
 856 void init_bpf(void);
 857 void send_via_bpf(struct dhcp_packet *mess, size_t len,
 858                   struct in_addr iface_addr, struct ifreq *ifr);
 859 #endif
 860
 861 /* bpf.c or netlink.c */
 862 int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)());
 863
 864 /* dbus.c */
 865 #ifdef HAVE_DBUS
 866 char *dbus_init(void);
 867 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
 868 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
 869 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
 870 #endif
 871
 872 /* helper.c */
 873 #if defined(HAVE_DHCP) && !defined(NO_FORK)
 874 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
 875 void helper_write(void);
 876 void queue_script(int action, struct dhcp_lease *lease,
 877                   char *hostname, time_t now);
 878 int helper_buf_empty(void);
 879 #endif
 880
 881 /* tftp.c */
 882 #ifdef HAVE_TFTP
 883 void tftp_request(struct listener *listen, time_t now);
 884 void check_tftp_listeners(fd_set *rset, time_t now);
 885 #endif