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      1 /* dnsmasq is Copyright (c) 2000-2009 Simon Kelley
      2 
      3    This program is free software; you can redistribute it and/or modify
      4    it under the terms of the GNU General Public License as published by
      5    the Free Software Foundation; version 2 dated June, 1991, or
      6    (at your option) version 3 dated 29 June, 2007.
      7 
      8    This program is distributed in the hope that it will be useful,
      9    but WITHOUT ANY WARRANTY; without even the implied warranty of
     10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11    GNU General Public License for more details.
     12 
     13    You should have received a copy of the GNU General Public License
     14    along with this program.  If not, see <http://www.gnu.org/licenses/>.
     15 */
     16 
     17 #define COPYRIGHT "Copyright (C) 2000-2009 Simon Kelley"
     18 
     19 #ifndef NO_LARGEFILE
     20 /* Ensure we can use files >2GB (log files may grow this big) */
     21 #  define _LARGEFILE_SOURCE 1
     22 #  define _FILE_OFFSET_BITS 64
     23 #endif
     24 
     25 /* Get linux C library versions. */
     26 #ifdef __linux__
     27 #  ifndef __ANDROID__
     28 #      define _GNU_SOURCE
     29 #  endif
     30 #  include <features.h>
     31 #endif
     32 
     33 /* get these before config.h  for IPv6 stuff... */
     34 #include <sys/types.h>
     35 #include <sys/socket.h>
     36 #include <netinet/in.h>
     37 
     38 #ifdef __APPLE__
     39 #  include <nameser.h>
     40 #  include <arpa/nameser_compat.h>
     41 #else
     42 #  ifdef __ANDROID__
     43 #    include "nameser.h"
     44 #  else
     45 #    include <arpa/nameser.h>
     46 #  endif
     47 #endif
     48 
     49 /* and this. */
     50 #include <getopt.h>
     51 
     52 #include "config.h"
     53 
     54 #define gettext_noop(S) (S)
     55 #ifndef LOCALEDIR
     56 #  define _(S) (S)
     57 #else
     58 #  include <libintl.h>
     59 #  include <locale.h>
     60 #  define _(S) gettext(S)
     61 #endif
     62 
     63 #include <arpa/inet.h>
     64 #include <sys/stat.h>
     65 #include <sys/ioctl.h>
     66 #if defined(HAVE_SOLARIS_NETWORK)
     67 #include <sys/sockio.h>
     68 #endif
     69 #include <sys/select.h>
     70 #include <sys/wait.h>
     71 #include <sys/time.h>
     72 #include <sys/un.h>
     73 #include <limits.h>
     74 #include <net/if.h>
     75 #include <unistd.h>
     76 #include <stdio.h>
     77 #include <string.h>
     78 #include <stdlib.h>
     79 #include <fcntl.h>
     80 #include <ctype.h>
     81 #include <signal.h>
     82 #include <stddef.h>
     83 #include <time.h>
     84 #include <errno.h>
     85 #include <pwd.h>
     86 #include <grp.h>
     87 #include <stdarg.h>
     88 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__)
     89 #  include <netinet/if_ether.h>
     90 #else
     91 #  include <net/ethernet.h>
     92 #endif
     93 #include <net/if_arp.h>
     94 #include <netinet/in_systm.h>
     95 #include <netinet/ip.h>
     96 #include <netinet/ip_icmp.h>
     97 #include <sys/uio.h>
     98 #include <syslog.h>
     99 #include <dirent.h>
    100 #ifndef HAVE_LINUX_NETWORK
    101 #  include <net/if_dl.h>
    102 #endif
    103 
    104 #if defined(HAVE_LINUX_NETWORK)
    105 #include <linux/capability.h>
    106 /* There doesn't seem to be a universally-available
    107    userpace header for these. */
    108 extern int capset(cap_user_header_t header, cap_user_data_t data);
    109 extern int capget(cap_user_header_t header, cap_user_data_t data);
    110 #define LINUX_CAPABILITY_VERSION_1  0x19980330
    111 #define LINUX_CAPABILITY_VERSION_2  0x20071026
    112 #define LINUX_CAPABILITY_VERSION_3  0x20080522
    113 
    114 #include <sys/prctl.h>
    115 #elif defined(HAVE_SOLARIS_NETWORK)
    116 #include <priv.h>
    117 #endif
    118 
    119 /* daemon is function in the C library.... */
    120 #define daemon dnsmasq_daemon
    121 
    122 /* Async event queue */
    123 struct event_desc {
    124   int event, data;
    125 };
    126 
    127 #define EVENT_RELOAD    1
    128 #define EVENT_DUMP      2
    129 #define EVENT_ALARM     3
    130 #define EVENT_TERM      4
    131 #define EVENT_CHILD     5
    132 #define EVENT_REOPEN    6
    133 #define EVENT_EXITED    7
    134 #define EVENT_KILLED    8
    135 #define EVENT_EXEC_ERR  9
    136 #define EVENT_PIPE_ERR  10
    137 #define EVENT_USER_ERR  11
    138 #define EVENT_CAP_ERR   12
    139 #define EVENT_PIDFILE   13
    140 #define EVENT_HUSER_ERR 14
    141 #define EVENT_GROUP_ERR 15
    142 #define EVENT_DIE       16
    143 #define EVENT_LOG_ERR   17
    144 #define EVENT_FORK_ERR  18
    145 
    146 /* Exit codes. */
    147 #define EC_GOOD        0
    148 #define EC_BADCONF     1
    149 #define EC_BADNET      2
    150 #define EC_FILE        3
    151 #define EC_NOMEM       4
    152 #define EC_MISC        5
    153 #define EC_INIT_OFFSET 10
    154 
    155 /* Min buffer size: we check after adding each record, so there must be
    156    memory for the largest packet, and the largest record so the
    157    min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000.
    158    This might be increased is EDNS packet size if greater than the minimum.
    159 */
    160 #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
    161 
    162 #define OPT_BOGUSPRIV      (1u<<0)
    163 #define OPT_FILTER         (1u<<1)
    164 #define OPT_LOG            (1u<<2)
    165 #define OPT_SELFMX         (1u<<3)
    166 #define OPT_NO_HOSTS       (1u<<4)
    167 #define OPT_NO_POLL        (1u<<5)
    168 #define OPT_DEBUG          (1u<<6)
    169 #define OPT_ORDER          (1u<<7)
    170 #define OPT_NO_RESOLV      (1u<<8)
    171 #define OPT_EXPAND         (1u<<9)
    172 #define OPT_LOCALMX        (1u<<10)
    173 #define OPT_NO_NEG         (1u<<11)
    174 #define OPT_NODOTS_LOCAL   (1u<<12)
    175 #define OPT_NOWILD         (1u<<13)
    176 #define OPT_ETHERS         (1u<<14)
    177 #define OPT_RESOLV_DOMAIN  (1u<<15)
    178 #define OPT_NO_FORK        (1u<<16)
    179 #define OPT_AUTHORITATIVE  (1u<<17)
    180 #define OPT_LOCALISE       (1u<<18)
    181 #define OPT_DBUS           (1u<<19)
    182 #define OPT_DHCP_FQDN      (1u<<20)
    183 #define OPT_NO_PING        (1u<<21)
    184 #define OPT_LEASE_RO       (1u<<22)
    185 #define OPT_ALL_SERVERS    (1u<<23)
    186 #define OPT_RELOAD         (1u<<24)
    187 #define OPT_TFTP           (1u<<25)
    188 #define OPT_TFTP_SECURE    (1u<<26)
    189 #define OPT_TFTP_NOBLOCK   (1u<<27)
    190 #define OPT_LOG_OPTS       (1u<<28)
    191 #define OPT_TFTP_APREF     (1u<<29)
    192 #define OPT_NO_OVERRIDE    (1u<<30)
    193 #define OPT_NO_REBIND      (1u<<31)
    194 
    195 /* extra flags for my_syslog, we use a couple of facilities since they are known
    196    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
    197 #define MS_TFTP LOG_USER
    198 #define MS_DHCP LOG_DAEMON
    199 
    200 struct all_addr {
    201   union {
    202     struct in_addr addr4;
    203 #ifdef HAVE_IPV6
    204     struct in6_addr addr6;
    205 #endif
    206   } addr;
    207 };
    208 
    209 struct bogus_addr {
    210   struct in_addr addr;
    211   struct bogus_addr *next;
    212 };
    213 
    214 /* dns doctor param */
    215 struct doctor {
    216   struct in_addr in, end, out, mask;
    217   struct doctor *next;
    218 };
    219 
    220 struct mx_srv_record {
    221   char *name, *target;
    222   int issrv, srvport, priority, weight;
    223   unsigned int offset;
    224   struct mx_srv_record *next;
    225 };
    226 
    227 struct naptr {
    228   char *name, *replace, *regexp, *services, *flags;
    229   unsigned int order, pref;
    230   struct naptr *next;
    231 };
    232 
    233 struct txt_record {
    234   char *name, *txt;
    235   unsigned short class, len;
    236   struct txt_record *next;
    237 };
    238 
    239 struct ptr_record {
    240   char *name, *ptr;
    241   struct ptr_record *next;
    242 };
    243 
    244 struct cname {
    245   char *alias, *target;
    246   struct cname *next;
    247 };
    248 
    249 struct interface_name {
    250   char *name; /* domain name */
    251   char *intr; /* interface name */
    252   struct interface_name *next;
    253 };
    254 
    255 union bigname {
    256   char name[MAXDNAME];
    257   union bigname *next; /* freelist */
    258 };
    259 
    260 struct crec {
    261   struct crec *next, *prev, *hash_next;
    262   time_t ttd; /* time to die */
    263   int uid;
    264   union {
    265     struct all_addr addr;
    266     struct {
    267       struct crec *cache;
    268       int uid;
    269     } cname;
    270   } addr;
    271   unsigned short flags;
    272   union {
    273     char sname[SMALLDNAME];
    274     union bigname *bname;
    275     char *namep;
    276   } name;
    277 };
    278 
    279 #define F_IMMORTAL  1
    280 #define F_CONFIG    2
    281 #define F_REVERSE   4
    282 #define F_FORWARD   8
    283 #define F_DHCP      16
    284 #define F_NEG       32
    285 #define F_HOSTS     64
    286 #define F_IPV4      128
    287 #define F_IPV6      256
    288 #define F_BIGNAME   512
    289 #define F_UPSTREAM  1024
    290 #define F_SERVER    2048
    291 #define F_NXDOMAIN  4096
    292 #define F_QUERY     8192
    293 #define F_CNAME     16384
    294 #define F_NOERR     32768
    295 
    296 /* struct sockaddr is not large enough to hold any address,
    297    and specifically not big enough to hold an IPv6 address.
    298    Blech. Roll our own. */
    299 union mysockaddr {
    300   struct sockaddr sa;
    301   struct sockaddr_in in;
    302 #if 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, mtu;
    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 #define AH_DIR      1
    372 #define AH_INACTIVE 2
    373 struct hostsfile {
    374   struct hostsfile *next;
    375   int flags;
    376   char *fname;
    377   int index; /* matches to cache entries for logging */
    378 };
    379 
    380 struct frec {
    381   union mysockaddr source;
    382   struct all_addr dest;
    383   struct server *sentto; /* NULL means free */
    384   struct randfd *rfd4;
    385 #ifdef HAVE_IPV6
    386   struct randfd *rfd6;
    387 #endif
    388   unsigned int iface;
    389   unsigned short orig_id, new_id;
    390   int fd, forwardall;
    391   unsigned int crc;
    392   time_t time;
    393   struct frec *next;
    394 };
    395 
    396 /* actions in the daemon->helper RPC */
    397 #define ACTION_DEL           1
    398 #define ACTION_OLD_HOSTNAME  2
    399 #define ACTION_OLD           3
    400 #define ACTION_ADD           4
    401 
    402 #define DHCP_CHADDR_MAX 16
    403 
    404 struct dhcp_lease {
    405   int clid_len;          /* length of client identifier */
    406   unsigned char *clid;   /* clientid */
    407   char *hostname, *fqdn; /* name from client-hostname option or config */
    408   char *old_hostname;    /* hostname before it moved to another lease */
    409   char auth_name;        /* hostname came from config, not from client */
    410   char new;              /* newly created */
    411   char changed;          /* modified */
    412   char aux_changed;      /* CLID or expiry changed */
    413   time_t expires;        /* lease expiry */
    414 #ifdef HAVE_BROKEN_RTC
    415   unsigned int length;
    416 #endif
    417   int hwaddr_len, hwaddr_type;
    418   unsigned char hwaddr[DHCP_CHADDR_MAX];
    419   struct in_addr addr, override, giaddr;
    420   unsigned char *vendorclass, *userclass, *supplied_hostname;
    421   unsigned int vendorclass_len, userclass_len, supplied_hostname_len;
    422   int last_interface;
    423   struct dhcp_lease *next;
    424 };
    425 
    426 struct dhcp_netid {
    427   char *net;
    428   struct dhcp_netid *next;
    429 };
    430 
    431 struct dhcp_netid_list {
    432   struct dhcp_netid *list;
    433   struct dhcp_netid_list *next;
    434 };
    435 
    436 struct hwaddr_config {
    437   int hwaddr_len, hwaddr_type;
    438   unsigned char hwaddr[DHCP_CHADDR_MAX];
    439   unsigned int wildcard_mask;
    440   struct hwaddr_config *next;
    441 };
    442 
    443 struct dhcp_config {
    444   unsigned int flags;
    445   int clid_len;          /* length of client identifier */
    446   unsigned char *clid;   /* clientid */
    447   char *hostname, *domain;
    448   struct dhcp_netid netid;
    449   struct in_addr addr;
    450   time_t decline_time;
    451   unsigned int lease_time;
    452   struct hwaddr_config *hwaddr;
    453   struct dhcp_config *next;
    454 };
    455 
    456 #define CONFIG_DISABLE           1
    457 #define CONFIG_CLID              2
    458 #define CONFIG_TIME              8
    459 #define CONFIG_NAME             16
    460 #define CONFIG_ADDR             32
    461 #define CONFIG_NETID            64
    462 #define CONFIG_NOCLID          128
    463 #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
    464 #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
    465 #define CONFIG_DECLINED       1024    /* address declined by client */
    466 #define CONFIG_BANK           2048    /* from dhcp hosts file */
    467 
    468 struct dhcp_opt {
    469   int opt, len, flags;
    470   union {
    471     int encap;
    472     unsigned int wildcard_mask;
    473     unsigned char *vendor_class;
    474   } u;
    475   unsigned char *val;
    476   struct dhcp_netid *netid;
    477   struct dhcp_opt *next;
    478 };
    479 
    480 #define DHOPT_ADDR               1
    481 #define DHOPT_STRING             2
    482 #define DHOPT_ENCAPSULATE        4
    483 #define DHOPT_ENCAP_MATCH        8
    484 #define DHOPT_FORCE             16
    485 #define DHOPT_BANK              32
    486 #define DHOPT_ENCAP_DONE        64
    487 #define DHOPT_MATCH            128
    488 #define DHOPT_VENDOR           256
    489 #define DHOPT_HEX              512
    490 #define DHOPT_VENDOR_MATCH    1024
    491 
    492 struct dhcp_boot {
    493   char *file, *sname;
    494   struct in_addr next_server;
    495   struct dhcp_netid *netid;
    496   struct dhcp_boot *next;
    497 };
    498 
    499 struct pxe_service {
    500   unsigned short CSA, type;
    501   char *menu, *basename;
    502   struct in_addr server;
    503   struct dhcp_netid *netid;
    504   struct pxe_service *next;
    505 };
    506 
    507 #define MATCH_VENDOR     1
    508 #define MATCH_USER       2
    509 #define MATCH_CIRCUIT    3
    510 #define MATCH_REMOTE     4
    511 #define MATCH_SUBSCRIBER 5
    512 
    513 /* vendorclass, userclass, remote-id or cicuit-id */
    514 struct dhcp_vendor {
    515   int len, match_type, option;
    516   char *data;
    517   struct dhcp_netid netid;
    518   struct dhcp_vendor *next;
    519 };
    520 
    521 struct dhcp_mac {
    522   unsigned int mask;
    523   int hwaddr_len, hwaddr_type;
    524   unsigned char hwaddr[DHCP_CHADDR_MAX];
    525   struct dhcp_netid netid;
    526   struct dhcp_mac *next;
    527 };
    528 
    529 struct dhcp_bridge {
    530   char iface[IF_NAMESIZE];
    531   struct dhcp_bridge *alias, *next;
    532 };
    533 
    534 struct cond_domain {
    535   char *domain;
    536   struct in_addr start, end;
    537   struct cond_domain *next;
    538 };
    539 
    540 struct dhcp_context {
    541   unsigned int lease_time, addr_epoch;
    542   struct in_addr netmask, broadcast;
    543   struct in_addr local, router;
    544   struct in_addr start, end; /* range of available addresses */
    545   int flags;
    546   struct dhcp_netid netid, *filter;
    547   struct dhcp_context *next, *current;
    548 };
    549 
    550 #define CONTEXT_STATIC    1
    551 #define CONTEXT_NETMASK   2
    552 #define CONTEXT_BRDCAST   4
    553 #define CONTEXT_PROXY     8
    554 
    555 
    556 typedef unsigned char u8;
    557 typedef unsigned short u16;
    558 typedef unsigned int u32;
    559 
    560 
    561 struct dhcp_packet {
    562   u8 op, htype, hlen, hops;
    563   u32 xid;
    564   u16 secs, flags;
    565   struct in_addr ciaddr, yiaddr, siaddr, giaddr;
    566   u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128];
    567   u8 options[312];
    568 };
    569 
    570 struct ping_result {
    571   struct in_addr addr;
    572   time_t time;
    573   struct ping_result *next;
    574 };
    575 
    576 struct tftp_file {
    577   int refcount, fd;
    578   off_t size;
    579   dev_t dev;
    580   ino_t inode;
    581   char filename[];
    582 };
    583 
    584 struct tftp_transfer {
    585   int sockfd;
    586   time_t timeout;
    587   int backoff;
    588   unsigned int block, blocksize, expansion;
    589   off_t offset;
    590   struct sockaddr_in peer;
    591   char opt_blocksize, opt_transize, netascii, carrylf;
    592   struct tftp_file *file;
    593   struct tftp_transfer *next;
    594 };
    595 
    596 extern struct daemon {
    597   /* datastuctures representing the command-line and
    598      config file arguments. All set (including defaults)
    599      in option.c */
    600 
    601   unsigned int options;
    602   struct resolvc default_resolv, *resolv_files;
    603   time_t last_resolv;
    604   struct mx_srv_record *mxnames;
    605   struct naptr *naptr;
    606   struct txt_record *txt;
    607   struct ptr_record *ptr;
    608   struct cname *cnames;
    609   struct interface_name *int_names;
    610   char *mxtarget;
    611   char *lease_file;
    612   char *username, *groupname, *scriptuser;
    613   int group_set, osport;
    614   char *domain_suffix;
    615   struct cond_domain *cond_domain;
    616   char *runfile;
    617   char *lease_change_command;
    618   struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
    619   struct bogus_addr *bogus_addr;
    620   struct server *servers;
    621   int log_fac; /* log facility */
    622   char *log_file; /* optional log file */
    623   int max_logs;  /* queue limit */
    624   int cachesize, ftabsize;
    625   int port, query_port, min_port;
    626   unsigned long local_ttl, neg_ttl;
    627   struct hostsfile *addn_hosts;
    628   struct dhcp_context *dhcp;
    629   struct dhcp_config *dhcp_conf;
    630   struct dhcp_opt *dhcp_opts, *dhcp_match;
    631   struct dhcp_vendor *dhcp_vendors;
    632   struct dhcp_mac *dhcp_macs;
    633   struct dhcp_boot *boot_config;
    634   struct pxe_service *pxe_services;
    635   int enable_pxe;
    636   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic;
    637   char *dhcp_hosts_file, *dhcp_opts_file;
    638   int dhcp_max, tftp_max;
    639   int dhcp_server_port, dhcp_client_port;
    640   int start_tftp_port, end_tftp_port;
    641   unsigned int min_leasetime;
    642   struct doctor *doctors;
    643   unsigned short edns_pktsz;
    644   char *tftp_prefix;
    645 
    646   /* globally used stuff for DNS */
    647   char *packet; /* packet buffer */
    648   int packet_buff_sz; /* size of above */
    649   char *namebuff; /* MAXDNAME size buffer */
    650   unsigned int local_answer, queries_forwarded;
    651   struct frec *frec_list;
    652   struct serverfd *sfds;
    653   struct irec *interfaces;
    654   struct listener *listeners;
    655   struct server *last_server;
    656   time_t forwardtime;
    657   int forwardcount;
    658   struct server *srv_save; /* Used for resend on DoD */
    659   size_t packet_len;       /*      "        "        */
    660   struct randfd *rfd_save; /*      "        "        */
    661   pid_t tcp_pids[MAX_PROCS];
    662   struct randfd randomsocks[RANDOM_SOCKS];
    663 
    664   /* DHCP state */
    665   int dhcpfd, helperfd;
    666 #if defined(HAVE_LINUX_NETWORK)
    667   int netlinkfd;
    668 #elif defined(HAVE_BSD_NETWORK)
    669   int dhcp_raw_fd, dhcp_icmp_fd;
    670 #endif
    671   struct iovec dhcp_packet;
    672   char *dhcp_buff, *dhcp_buff2;
    673   struct ping_result *ping_results;
    674   FILE *lease_stream;
    675   struct dhcp_bridge *bridges;
    676 
    677   /* DBus stuff */
    678   /* void * here to avoid depending on dbus headers outside dbus.c */
    679   void *dbus;
    680 #ifdef HAVE_DBUS
    681   struct watch *watches;
    682 #endif
    683 
    684   /* TFTP stuff */
    685   struct tftp_transfer *tftp_trans;
    686 
    687 } *daemon;
    688 
    689 /* cache.c */
    690 void cache_init(void);
    691 void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg);
    692 char *record_source(int index);
    693 void querystr(char *str, unsigned short type);
    694 struct crec *cache_find_by_addr(struct crec *crecp,
    695 				struct all_addr *addr, time_t now,
    696 				unsigned short prot);
    697 struct crec *cache_find_by_name(struct crec *crecp,
    698 				char *name, time_t now, unsigned short  prot);
    699 void cache_end_insert(void);
    700 void cache_start_insert(void);
    701 struct crec *cache_insert(char *name, struct all_addr *addr,
    702 			  time_t now, unsigned long ttl, unsigned short flags);
    703 void cache_reload(void);
    704 void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd);
    705 void cache_unhash_dhcp(void);
    706 void dump_cache(time_t now);
    707 char *cache_get_name(struct crec *crecp);
    708 char *get_domain(struct in_addr addr);
    709 
    710 /* rfc1035.c */
    711 unsigned short extract_request(HEADER *header, size_t qlen,
    712 			       char *name, unsigned short *typep);
    713 size_t setup_reply(HEADER *header, size_t  qlen,
    714 		   struct all_addr *addrp, unsigned short flags,
    715 		   unsigned long local_ttl);
    716 int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now);
    717 size_t answer_request(HEADER *header, char *limit, size_t qlen,
    718 		   struct in_addr local_addr, struct in_addr local_netmask, time_t now);
    719 int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name,
    720 			     struct bogus_addr *addr, time_t now);
    721 unsigned char *find_pseudoheader(HEADER *header, size_t plen,
    722 				 size_t *len, unsigned char **p, int *is_sign);
    723 int check_for_local_domain(char *name, time_t now);
    724 unsigned int questions_crc(HEADER *header, size_t plen, char *buff);
    725 size_t resize_packet(HEADER *header, size_t plen,
    726 		  unsigned char *pheader, size_t hlen);
    727 
    728 /* util.c */
    729 void rand_init(void);
    730 unsigned short rand16(void);
    731 int legal_hostname(char *c);
    732 char *canonicalise(char *s, int *nomem);
    733 unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
    734 void *safe_malloc(size_t size);
    735 void safe_pipe(int *fd, int read_noblock);
    736 void *whine_malloc(size_t size);
    737 int sa_len(union mysockaddr *addr);
    738 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
    739 int hostname_isequal(char *a, char *b);
    740 time_t dnsmasq_time(void);
    741 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
    742 int retry_send(void);
    743 void prettyprint_time(char *buf, unsigned int t);
    744 int prettyprint_addr(union mysockaddr *addr, char *buf);
    745 int parse_hex(char *in, unsigned char *out, int maxlen,
    746 	      unsigned int *wildcard_mask, int *mac_type);
    747 int memcmp_masked(unsigned char *a, unsigned char *b, int len,
    748 		  unsigned int mask);
    749 int expand_buf(struct iovec *iov, size_t size);
    750 char *print_mac(char *buff, unsigned char *mac, int len);
    751 void bump_maxfd(int fd, int *max);
    752 int read_write(int fd, unsigned char *packet, int size, int rw);
    753 
    754 /* log.c */
    755 void die(char *message, char *arg1, int exit_code);
    756 int log_start(struct passwd *ent_pw, int errfd);
    757 int log_reopen(char *log_file);
    758 void my_syslog(int priority, const char *format, ...);
    759 void set_log_writer(fd_set *set, int *maxfdp);
    760 void check_log_writer(fd_set *set);
    761 void flush_log(void);
    762 
    763 /* option.c */
    764 void read_opts (int argc, char **argv, char *compile_opts);
    765 char *option_string(unsigned char opt, int *is_ip, int *is_name);
    766 void reread_dhcp(void);
    767 
    768 /* forward.c */
    769 void reply_query(int fd, int family, time_t now);
    770 void receive_query(struct listener *listen, time_t now);
    771 unsigned char *tcp_request(int confd, time_t now,
    772 			   struct in_addr local_addr, struct in_addr netmask);
    773 void server_gone(struct server *server);
    774 struct frec *get_new_frec(time_t now, int *wait);
    775 
    776 /* network.c */
    777 int indextoname(int fd, int index, char *name);
    778 int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
    779 int random_sock(int family);
    780 void pre_allocate_sfds(void);
    781 int reload_servers(char *fname);
    782 #ifdef __ANDROID__
    783 int set_servers(const char *servers);
    784 void set_interfaces(const char *interfaces);
    785 #endif
    786 void check_servers(void);
    787 int enumerate_interfaces();
    788 struct listener *create_wildcard_listeners(void);
    789 struct listener *create_bound_listeners(void);
    790 int iface_check(int family, struct all_addr *addr, char *name, int *indexp);
    791 int fix_fd(int fd);
    792 struct in_addr get_ifaddr(char *intr);
    793 
    794 /* dhcp.c */
    795 #ifdef HAVE_DHCP
    796 void dhcp_init(void);
    797 void dhcp_packet(time_t now);
    798 struct dhcp_context *address_available(struct dhcp_context *context,
    799 				       struct in_addr addr,
    800 				       struct dhcp_netid *netids);
    801 struct dhcp_context *narrow_context(struct dhcp_context *context,
    802 				    struct in_addr taddr,
    803 				    struct dhcp_netid *netids);
    804 int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context,
    805 		     struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
    806 		     struct dhcp_netid *netids, time_t now);
    807 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
    808 struct dhcp_config *find_config(struct dhcp_config *configs,
    809 				struct dhcp_context *context,
    810 				unsigned char *clid, int clid_len,
    811 				unsigned char *hwaddr, int hw_len,
    812 				int hw_type, char *hostname);
    813 void dhcp_update_configs(struct dhcp_config *configs);
    814 void dhcp_read_ethers(void);
    815 void check_dhcp_hosts(int fatal);
    816 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
    817 char *strip_hostname(char *hostname);
    818 char *host_from_dns(struct in_addr addr);
    819 char *get_domain(struct in_addr addr);
    820 #endif
    821 
    822 /* lease.c */
    823 #ifdef HAVE_DHCP
    824 void lease_update_file(time_t now);
    825 void lease_update_dns();
    826 void lease_init(time_t now);
    827 struct dhcp_lease *lease_allocate(struct in_addr addr);
    828 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
    829 		      unsigned char *clid, int hw_len, int hw_type, int clid_len);
    830 void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth);
    831 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
    832 void lease_set_interface(struct dhcp_lease *lease, int interface);
    833 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
    834 					unsigned char *clid, int clid_len);
    835 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
    836 void lease_prune(struct dhcp_lease *target, time_t now);
    837 void lease_update_from_configs(void);
    838 int do_script_run(time_t now);
    839 void rerun_scripts(void);
    840 #endif
    841 
    842 /* rfc2131.c */
    843 #ifdef HAVE_DHCP
    844 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
    845 		  size_t sz, time_t now, int unicast_dest, int *is_inform);
    846 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
    847 			       int clid_len, unsigned char *clid, int *len_out);
    848 #endif
    849 
    850 /* dnsmasq.c */
    851 #ifdef HAVE_DHCP
    852 int make_icmp_sock(void);
    853 int icmp_ping(struct in_addr addr);
    854 #endif
    855 void send_event(int fd, int event, int data);
    856 void clear_cache_and_reload(time_t now);
    857 
    858 /* netlink.c */
    859 #ifdef HAVE_LINUX_NETWORK
    860 void netlink_init(void);
    861 void netlink_multicast(void);
    862 #endif
    863 
    864 /* bpf.c */
    865 #ifdef HAVE_BSD_NETWORK
    866 void init_bpf(void);
    867 void send_via_bpf(struct dhcp_packet *mess, size_t len,
    868 		  struct in_addr iface_addr, struct ifreq *ifr);
    869 #endif
    870 
    871 /* bpf.c or netlink.c */
    872 int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)());
    873 
    874 /* dbus.c */
    875 #ifdef HAVE_DBUS
    876 char *dbus_init(void);
    877 void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
    878 void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
    879 void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
    880 #endif
    881 
    882 /* helper.c */
    883 #if defined(HAVE_DHCP) && !defined(NO_FORK)
    884 int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
    885 void helper_write(void);
    886 void queue_script(int action, struct dhcp_lease *lease,
    887 		  char *hostname, time_t now);
    888 int helper_buf_empty(void);
    889 #endif
    890 
    891 /* tftp.c */
    892 #ifdef HAVE_TFTP
    893 void tftp_request(struct listener *listen, time_t now);
    894 void check_tftp_listeners(fd_set *rset, time_t now);
    895 #endif
    896