src/dnsmasq.h

   1 /* dnsmasq is Copyright (c) 2000-2008 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) 2000-2008 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 <netinet/in.h>
  34
  35 #ifdef __APPLE__
  36 #  include <nameser.h>
  37 #  include <arpa/nameser_compat.h>
  38 #else
  39 #  include <arpa/nameser.h>
  40 #endif
  41
  42 /* and this. */
  43 #include <getopt.h>
  44
  45 #include "config.h"
  46
  47 #define gettext_noop(S) (S)
  48 #ifndef LOCALEDIR
  49 #  define _(S) (S)
  50 #else
  51 #  include <libintl.h>
  52 #  include <locale.h>
  53 #  define _(S) gettext(S)
  54 #endif
  55
  56 #include <arpa/inet.h>
  57 #include <sys/stat.h>
  58 #include <sys/socket.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 <sys/prctl.h>
 109 #elif defined(HAVE_SOLARIS_PRIVS)
 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
 139 /* Exit codes. */
 140 #define EC_GOOD        0
 141 #define EC_BADCONF     1
 142 #define EC_BADNET      2
 143 #define EC_FILE        3
 144 #define EC_NOMEM       4
 145 #define EC_MISC        5
 146 #define EC_INIT_OFFSET 10
 147
 148 /* Min buffer size: we check after adding each record, so there must be
 149    memory for the largest packet, and the largest record so the
 150    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
 151    This might be increased is EDNS packet size if greater than the minimum.
 152 */
 153 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
 154
 155 #define OPT_BOGUSPRIV      (1u<<0)
 156 #define OPT_FILTER         (1u<<1)
 157 #define OPT_LOG            (1u<<2)
 158 #define OPT_SELFMX         (1u<<3)
 159 #define OPT_NO_HOSTS       (1u<<4)
 160 #define OPT_NO_POLL        (1u<<5)
 161 #define OPT_DEBUG          (1u<<6)
 162 #define OPT_ORDER          (1u<<7)
 163 #define OPT_NO_RESOLV      (1u<<8)
 164 #define OPT_EXPAND         (1u<<9)
 165 #define OPT_LOCALMX        (1u<<10)
 166 #define OPT_NO_NEG         (1u<<11)
 167 #define OPT_NODOTS_LOCAL   (1u<<12)
 168 #define OPT_NOWILD         (1u<<13)
 169 #define OPT_ETHERS         (1u<<14)
 170 #define OPT_RESOLV_DOMAIN  (1u<<15)
 171 #define OPT_NO_FORK        (1u<<16)
 172 #define OPT_AUTHORITATIVE  (1u<<17)
 173 #define OPT_LOCALISE       (1u<<18)
 174 #define OPT_DBUS           (1u<<19)
 175 #define OPT_DHCP_FQDN      (1u<<20)
 176 #define OPT_NO_PING        (1u<<21)
 177 #define OPT_LEASE_RO       (1u<<22)
 178 #define OPT_ALL_SERVERS    (1u<<23)
 179 #define OPT_RELOAD         (1u<<24)
 180 #define OPT_TFTP           (1u<<25)
 181 #define OPT_TFTP_SECURE    (1u<<26)
 182 #define OPT_TFTP_NOBLOCK   (1u<<27)
 183 #define OPT_LOG_OPTS       (1u<<28)
 184 #define OPT_TFTP_APREF     (1u<<29)
 185 #define OPT_NO_OVERRIDE    (1u<<30)
 186 #define OPT_NO_REBIND      (1u<<31)
 187
 188 struct all_addr {
 189   union {
 190     struct in_addr addr4;
 191 #ifdef HAVE_IPV6
 192     struct in6_addr addr6;
 193 #endif
 194   } addr;
 195 };
 196
 197 struct bogus_addr {
 198   struct in_addr addr;
 199   struct bogus_addr *next;
 200 };
 201
 202 /* dns doctor param */
 203 struct doctor {
 204   struct in_addr in, out, mask;
 205   struct doctor *next;
 206 };
 207
 208 struct mx_srv_record {
 209   char *name, *target;
 210   int issrv, srvport, priority, weight;
 211   unsigned int offset;
 212   struct mx_srv_record *next;
 213 };
 214
 215 struct naptr {
 216   char *name, *replace, *regexp, *services, *flags;
 217   unsigned int order, pref;
 218   struct naptr *next;
 219 };
 220
 221 struct txt_record {
 222   char *name, *txt;
 223   unsigned short class, len;
 224   struct txt_record *next;
 225 };
 226
 227 struct ptr_record {
 228   char *name, *ptr;
 229   struct ptr_record *next;
 230 };
 231
 232 struct cname {
 233   char *alias, *target;
 234   struct cname *next;
 235 };
 236
 237 struct interface_name {
 238   char *name; /* domain name */
 239   char *intr; /* interface name */
 240   struct interface_name *next;
 241 };
 242
 243 union bigname {
 244   char name[MAXDNAME];
 245   union bigname *next; /* freelist */
 246 };
 247
 248 struct crec {
 249   struct crec *next, *prev, *hash_next;
 250   time_t ttd; /* time to die */
 251   int uid;
 252   union {
 253     struct all_addr addr;
 254     struct {
 255       struct crec *cache;
 256       int uid;
 257     } cname;
 258   } addr;
 259   unsigned short flags;
 260   union {
 261     char sname[SMALLDNAME];
 262     union bigname *bname;
 263     char *namep;
 264   } name;
 265 };
 266
 267 #define F_IMMORTAL  1
 268 #define F_CONFIG    2
 269 #define F_REVERSE   4
 270 #define F_FORWARD   8
 271 #define F_DHCP      16
 272 #define F_NEG       32
 273 #define F_HOSTS     64
 274 #define F_IPV4      128
 275 #define F_IPV6      256
 276 #define F_BIGNAME   512
 277 #define F_UPSTREAM  1024
 278 #define F_SERVER    2048
 279 #define F_NXDOMAIN  4096
 280 #define F_QUERY     8192
 281 #define F_CNAME     16384
 282 #define F_NOERR     32768
 283
 284 /* struct sockaddr is not large enough to hold any address,
 285    and specifically not big enough to hold an IPv6 address.
 286    Blech. Roll our own. */
 287 union mysockaddr {
 288   struct sockaddr sa;
 289   struct sockaddr_in in;
 290 #ifdef HAVE_BROKEN_SOCKADDR_IN6
 291   /* early versions of glibc don't include sin6_scope_id in sockaddr_in6
 292      but latest kernels _require_ it to be set. The choice is to have
 293      dnsmasq fail to compile on back-level libc or fail to run
 294      on latest kernels with IPv6. Or to do this: sorry that it's so gross. */
 295   struct my_sockaddr_in6 {
 296     sa_family_t     sin6_family;    /* AF_INET6 */
 297     uint16_t        sin6_port;      /* transport layer port # */
 298     uint32_t        sin6_flowinfo;  /* IPv6 traffic class & flow info */
 299     struct in6_addr sin6_addr;      /* IPv6 address */
 300     uint32_t        sin6_scope_id;  /* set of interfaces for a scope */
 301   } in6;
 302 #elif defined(HAVE_IPV6)
 303   struct sockaddr_in6 in6;
 304 #endif
 305 };
 306
 307 #define SERV_FROM_RESOLV       1  /* 1 for servers from resolv, 0 for command line. */
 308 #define SERV_NO_ADDR           2  /* no server, this domain is local only */
 309 #define SERV_LITERAL_ADDRESS   4  /* addr is the answer, not the server */
 310 #define SERV_HAS_DOMAIN        8  /* server for one domain only */
 311 #define SERV_HAS_SOURCE       16  /* source address defined */
 312 #define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
 313 #define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
 314 #define SERV_FROM_DBUS       128  /* 1 if source is DBus */
 315 #define SERV_MARK            256  /* for mark-and-delete */
 316 #define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)
 317 #define SERV_COUNTED         512  /* workspace for log code */
 318
 319 struct serverfd {
 320   int fd;
 321   union mysockaddr source_addr;
 322   char interface[IF_NAMESIZE+1];
 323   struct serverfd *next;
 324 };
 325
 326 struct randfd {
 327   int fd;
 328   unsigned short refcount, family;
 329 };
 330
 331 struct server {
 332   union mysockaddr addr, source_addr;
 333   char interface[IF_NAMESIZE+1];
 334   struct serverfd *sfd;
 335   char *domain; /* set if this server only handles a domain. */
 336   int flags, tcpfd;
 337   unsigned int queries, failed_queries;
 338   struct server *next;
 339 };
 340
 341 struct irec {
 342   union mysockaddr addr;
 343   struct in_addr netmask; /* only valid for IPv4 */
 344   int dhcp_ok;
 345   struct irec *next;
 346 };
 347
 348 struct listener {
 349   int fd, tcpfd, tftpfd, family;
 350   struct irec *iface; /* only valid for non-wildcard */
 351   struct listener *next;
 352 };
 353
 354 /* interface and address parms from command line. */
 355 struct iname {
 356   char *name;
 357   union mysockaddr addr;
 358   int isloop, used;
 359   struct iname *next;
 360 };
 361
 362 /* resolv-file parms from command-line */
 363 struct resolvc {
 364   struct resolvc *next;
 365   int is_default, logged;
 366   time_t mtime;
 367   char *name;
 368 };
 369
 370 /* adn-hosts parms from command-line */
 371 struct hostsfile {
 372   struct hostsfile *next;
 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;
 417   unsigned char *vendorclass, *userclass;
 418   unsigned int vendorclass_len, userclass_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_FROM_ETHERS     256    /* entry created by /etc/ethers */
 461 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
 462 #define CONFIG_DECLINED       1024    /* address declined by client */
 463 #define CONFIG_BANK           2048    /* from dhcp hosts file */
 464
 465 struct dhcp_opt {
 466   int opt, len, flags;
 467   unsigned char *val, *vendor_class;
 468   struct dhcp_netid *netid;
 469   struct dhcp_opt *next;
 470 };
 471
 472 #define DHOPT_ADDR               1
 473 #define DHOPT_STRING             2
 474 #define DHOPT_ENCAPSULATE        4
 475 #define DHOPT_VENDOR_MATCH       8
 476 #define DHOPT_FORCE             16
 477 #define DHOPT_BANK              32
 478
 479 struct dhcp_boot {
 480   char *file, *sname;
 481   struct in_addr next_server;
 482   struct dhcp_netid *netid;
 483   struct dhcp_boot *next;
 484 };
 485
 486 #define MATCH_VENDOR     1
 487 #define MATCH_USER       2
 488 #define MATCH_CIRCUIT    3
 489 #define MATCH_REMOTE     4
 490 #define MATCH_SUBSCRIBER 5
 491 #define MATCH_OPTION     6
 492
 493 /* vendorclass, userclass, remote-id or cicuit-id */
 494 struct dhcp_vendor {
 495   int len, match_type, option;
 496   char *data;
 497   struct dhcp_netid netid;
 498   struct dhcp_vendor *next;
 499 };
 500
 501 struct dhcp_mac {
 502   unsigned int mask;
 503   int hwaddr_len, hwaddr_type;
 504   unsigned char hwaddr[DHCP_CHADDR_MAX];
 505   struct dhcp_netid netid;
 506   struct dhcp_mac *next;
 507 };
 508
 509 #ifdef HAVE_BSD_BRIDGE
 510 struct dhcp_bridge {
 511   char iface[IF_NAMESIZE];
 512   struct dhcp_bridge *alias, *next;
 513 };
 514 #endif
 515
 516 struct cond_domain {
 517   char *domain;
 518   struct in_addr start, end;
 519   struct cond_domain *next;
 520 };
 521
 522 struct dhcp_context {
 523   unsigned int lease_time, addr_epoch;
 524   struct in_addr netmask, broadcast;
 525   struct in_addr local, router;
 526   struct in_addr start, end; /* range of available addresses */
 527   int flags;
 528   struct dhcp_netid netid, *filter;
 529   struct dhcp_context *next, *current;
 530 };
 531
 532 #define CONTEXT_STATIC    1
 533 #define CONTEXT_NETMASK   2
 534 #define CONTEXT_BRDCAST   4
 535
 536
 537 typedef unsigned char u8;
 538 typedef unsigned short u16;
 539 typedef unsigned int u32;
 540
 541
 542 struct dhcp_packet {
 543   u8 op, htype, hlen, hops;
 544   u32 xid;
 545   u16 secs, flags;
 546   struct in_addr ciaddr, yiaddr, siaddr, giaddr;
 547   u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128];
 548   u8 options[312];
 549 };
 550
 551 struct ping_result {
 552   struct in_addr addr;
 553   time_t time;
 554   struct ping_result *next;
 555 };
 556
 557 struct tftp_file {
 558   int refcount, fd;
 559   off_t size;
 560   dev_t dev;
 561   ino_t inode;
 562   char filename[];
 563 };
 564
 565 struct tftp_transfer {
 566   int sockfd;
 567   time_t timeout;
 568   int backoff;
 569   unsigned int block, blocksize, expansion;
 570   off_t offset;
 571   struct sockaddr_in peer;
 572   char opt_blocksize, opt_transize, netascii, carrylf;
 573   struct tftp_file *file;
 574   struct tftp_transfer *next;
 575 };
 576
 577 extern struct daemon {
 578   /* datastuctures representing the command-line and
 579      config file arguments. All set (including defaults)
 580      in option.c */
 581
 582   unsigned int options;
 583   struct resolvc default_resolv, *resolv_files;
 584   time_t last_resolv;
 585   struct mx_srv_record *mxnames;
 586   struct naptr *naptr;
 587   struct txt_record *txt;
 588   struct ptr_record *ptr;
 589   struct cname *cnames;
 590   struct interface_name *int_names;
 591   char *mxtarget;
 592   char *lease_file;
 593   char *username, *groupname, *scriptuser;
 594   int group_set, osport;
 595   char *domain_suffix;
 596   struct cond_domain *cond_domain;
 597   char *runfile;
 598   char *lease_change_command;
 599   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
 600   struct bogus_addr *bogus_addr;
 601   struct server *servers;
 602   int log_fac; /* log facility */
 603   char *log_file; /* optional log file */
 604   int max_logs;  /* queue limit */
 605   int cachesize, ftabsize;
 606   int port, query_port, min_port;
 607   unsigned long local_ttl, neg_ttl;
 608   struct hostsfile *addn_hosts;
 609   struct dhcp_context *dhcp;
 610   struct dhcp_config *dhcp_conf;
 611   struct dhcp_opt *dhcp_opts;
 612   struct dhcp_vendor *dhcp_vendors;
 613   struct dhcp_mac *dhcp_macs;
 614   struct dhcp_boot *boot_config;
 615   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic;
 616   char *dhcp_hosts_file, *dhcp_opts_file;
 617   int dhcp_max, tftp_max;
 618   int dhcp_server_port, dhcp_client_port;
 619   int start_tftp_port, end_tftp_port;
 620   unsigned int min_leasetime;
 621   struct doctor *doctors;
 622   unsigned short edns_pktsz;
 623   char *tftp_prefix;
 624
 625   /* globally used stuff for DNS */
 626   char *packet; /* packet buffer */
 627   int packet_buff_sz; /* size of above */
 628   char *namebuff; /* MAXDNAME size buffer */
 629   unsigned int local_answer, queries_forwarded;
 630   struct frec *frec_list;
 631   struct serverfd *sfds;
 632   struct irec *interfaces;
 633   struct listener *listeners;
 634   struct server *last_server;
 635   struct server *srv_save; /* Used for resend on DoD */
 636   size_t packet_len;       /*      "        "        */
 637   struct randfd *rfd_save; /*      "        "        */
 638 pid_t tcp_pids[MAX_PROCS];
 639   struct randfd randomsocks[RANDOM_SOCKS];
 640
 641   /* DHCP state */
 642   int dhcpfd, helperfd;
 643 #ifdef HAVE_LINUX_NETWORK
 644   int netlinkfd;
 645 #else
 646   int dhcp_raw_fd, dhcp_icmp_fd;
 647 #endif
 648   struct iovec dhcp_packet;
 649   char *dhcp_buff, *dhcp_buff2;
 650   struct ping_result *ping_results;
 651   FILE *lease_stream;
 652 #ifdef HAVE_BSD_BRIDGE
 653   struct dhcp_bridge *bridges;
 654 #endif
 655
 656   /* DBus stuff */
 657   /* void * here to avoid depending on dbus headers outside dbus.c */
 658   void *dbus;
 659 #ifdef HAVE_DBUS
 660   struct watch *watches;
 661 #endif
 662
 663   /* TFTP stuff */
 664   struct tftp_transfer *tftp_trans;
 665
 666 } *daemon;
 667
 668 /* cache.c */
 669 void cache_init(void);
 670 void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg);
 671 char *record_source(struct hostsfile *addn_hosts, int index);
 672 void querystr(char *str, unsigned short type);
 673 struct crec *cache_find_by_addr(struct crec *crecp,
 674                                 struct all_addr *addr, time_t now,
 675                                 unsigned short prot);
 676 struct crec *cache_find_by_name(struct crec *crecp,
 677                                 char *name, time_t now, unsigned short  prot);
 678 void cache_end_insert(void);
 679 void cache_start_insert(void);
 680 struct crec *cache_insert(char *name, struct all_addr *addr,
 681                           time_t now, unsigned long ttl, unsigned short flags);
 682 void cache_reload(struct hostsfile  *addn_hosts);
 683 void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd);
 684 void cache_unhash_dhcp(void);
 685 void dump_cache(time_t now);
 686 char *cache_get_name(struct crec *crecp);
 687
 688 /* rfc1035.c */
 689 unsigned short extract_request(HEADER *header, size_t qlen,
 690                                char *name, unsigned short *typep);
 691 size_t setup_reply(HEADER *header, size_t  qlen,
 692                    struct all_addr *addrp, unsigned short flags,
 693                    unsigned long local_ttl);
 694 int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now);
 695 size_t answer_request(HEADER *header, char *limit, size_t qlen,
 696                    struct in_addr local_addr, struct in_addr local_netmask, time_t now);
 697 int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name,
 698                              struct bogus_addr *addr, time_t now);
 699 unsigned char *find_pseudoheader(HEADER *header, size_t plen,
 700                                  size_t *len, unsigned char **p, int *is_sign);
 701 int check_for_local_domain(char *name, time_t now);
 702 unsigned int questions_crc(HEADER *header, size_t plen, char *buff);
 703 size_t resize_packet(HEADER *header, size_t plen,
 704                   unsigned char *pheader, size_t hlen);
 705
 706 /* util.c */
 707 void rand_init(void);
 708 unsigned short rand16(void);
 709 int legal_char(char c);
 710 int canonicalise(char *s);
 711 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
 712 void *safe_malloc(size_t size);
 713 void safe_pipe(int *fd, int read_noblock);
 714 void *whine_malloc(size_t size);
 715 int sa_len(union mysockaddr *addr);
 716 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 717 int hostname_isequal(char *a, char *b);
 718 time_t dnsmasq_time(void);
 719 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 720 int retry_send(void);
 721 void prettyprint_time(char *buf, unsigned int t);
 722 int prettyprint_addr(union mysockaddr *addr, char *buf);
 723 int parse_hex(char *in, unsigned char *out, int maxlen,
 724               unsigned int *wildcard_mask, int *mac_type);
 725 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
 726                   unsigned int mask);
 727 int expand_buf(struct iovec *iov, size_t size);
 728 char *print_mac(char *buff, unsigned char *mac, int len);
 729 void bump_maxfd(int fd, int *max);
 730 int read_write(int fd, unsigned char *packet, int size, int rw);
 731
 732 /* log.c */
 733 void die(char *message, char *arg1, int exit_code);
 734 int log_start(struct passwd *ent_pw, int errfd);
 735 int log_reopen(char *log_file);
 736 void my_syslog(int priority, const char *format, ...);
 737 void set_log_writer(fd_set *set, int *maxfdp);
 738 void check_log_writer(fd_set *set);
 739 void flush_log(void);
 740
 741 /* option.c */
 742 void read_opts (int argc, char **argv, char *compile_opts);
 743 char *option_string(unsigned char opt);
 744 void reread_dhcp(void);
 745
 746 /* forward.c */
 747 void reply_query(int fd, int family, time_t now);
 748 void receive_query(struct listener *listen, time_t now);
 749 unsigned char *tcp_request(int confd, time_t now,
 750                            struct in_addr local_addr, struct in_addr netmask);
 751 void server_gone(struct server *server);
 752 struct frec *get_new_frec(time_t now, int *wait);
 753
 754 /* network.c */
 755 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 756 int random_sock(int family);
 757 void pre_allocate_sfds(void);
 758 int reload_servers(char *fname);
 759 void check_servers(void);
 760 int enumerate_interfaces();
 761 struct listener *create_wildcard_listeners(void);
 762 struct listener *create_bound_listeners(void);
 763 int iface_check(int family, struct all_addr *addr,
 764                 struct ifreq *ifr, int *indexp);
 765 int fix_fd(int fd);
 766 struct in_addr get_ifaddr(char *intr);
 767
 768 /* dhcp.c */
 769 void dhcp_init(void);
 770 void dhcp_packet(time_t now);
 771 char *get_domain(struct in_addr addr);
 772 struct dhcp_context *address_available(struct dhcp_context *context,
 773                                        struct in_addr addr,
 774                                        struct dhcp_netid *netids);
 775 struct dhcp_context *narrow_context(struct dhcp_context *context,
 776                                     struct in_addr taddr,
 777                                     struct dhcp_netid *netids);
 778 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context,
 779                      struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
 780                      struct dhcp_netid *netids, time_t now);
 781 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 782 struct dhcp_config *find_config(struct dhcp_config *configs,
 783                                 struct dhcp_context *context,
 784                                 unsigned char *clid, int clid_len,
 785                                 unsigned char *hwaddr, int hw_len,
 786                                 int hw_type, char *hostname);
 787 void dhcp_update_configs(struct dhcp_config *configs);
 788 void dhcp_read_ethers(void);
 789 void check_dhcp_hosts(int fatal);
 790 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
 791 char *strip_hostname(char *hostname);
 792 char *host_from_dns(struct in_addr addr);
 793 char *get_domain(struct in_addr addr);
 794
 795 /* lease.c */
 796 void lease_update_file(time_t now);
 797 void lease_update_dns();
 798 void lease_init(time_t now);
 799 struct dhcp_lease *lease_allocate(struct in_addr addr);
 800 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 801                       unsigned char *clid, int hw_len, int hw_type, int clid_len);
 802 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth);
 803 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
 804 void lease_set_interface(struct dhcp_lease *lease, int interface);
 805 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
 806                                         unsigned char *clid, int clid_len);
 807 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
 808 void lease_prune(struct dhcp_lease *target, time_t now);
 809 void lease_update_from_configs(void);
 810 int do_script_run(time_t now);
 811 void rerun_scripts(void);
 812
 813 /* rfc2131.c */
 814 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 815                   size_t sz, time_t now, int unicast_dest, int *is_inform);
 816 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
 817                                int clid_len, unsigned char *clid, int *len_out);
 818
 819 /* dnsmasq.c */
 820 int make_icmp_sock(void);
 821 int icmp_ping(struct in_addr addr);
 822 void send_event(int fd, int event, int data);
 823 void clear_cache_and_reload(time_t now);
 824
 825 /* netlink.c */
 826 #ifdef HAVE_LINUX_NETWORK
 827 void netlink_init(void);
 828 void netlink_multicast(void);
 829 #endif
 830
 831 /* bpf.c */
 832 #ifdef HAVE_BSD_NETWORK
 833 void init_bpf(void);
 834 void send_via_bpf(struct dhcp_packet *mess, size_t len,
 835                   struct in_addr iface_addr, struct ifreq *ifr);
 836 #endif
 837
 838 /* bpf.c or netlink.c */
 839 int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)());
 840
 841 /* dbus.c */
 842 #ifdef HAVE_DBUS
 843 char *dbus_init(void);
 844 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
 845 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
 846 void emit_dbus_signal(int action, char *mac, char *hostname, char *addr);
 847 #endif
 848
 849 /* helper.c */
 850 #ifndef NO_FORK
 851 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
 852 void helper_write(void);
 853 void queue_script(int action, struct dhcp_lease *lease,
 854                   char *hostname, time_t now);
 855 int helper_buf_empty(void);
 856 #endif
 857
 858 /* tftp.c */
 859 #ifdef HAVE_TFTP
 860 void tftp_request(struct listener *listen, time_t now);
 861 void check_tftp_listeners(fd_set *rset, time_t now);
 862 #endif