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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    uint32_t mark;
325  };
326  
327  struct randfd {
328    int fd;
329    unsigned short refcount, family;
330  };
331  
332  struct server {
333    union mysockaddr addr, source_addr;
334    char interface[IF_NAMESIZE+1];
335    struct serverfd *sfd;
336    char *domain; /* set if this server only handles a domain. */
337    int flags, tcpfd;
338    unsigned int queries, failed_queries;
339    uint32_t mark;
340    struct server *next;
341  };
342  
343  struct irec {
344    union mysockaddr addr;
345    struct in_addr netmask; /* only valid for IPv4 */
346    int dhcp_ok, mtu;
347    struct irec *next;
348  };
349  
350  struct listener {
351    int fd, tcpfd, tftpfd, family;
352    struct irec *iface; /* only valid for non-wildcard */
353    struct listener *next;
354  };
355  
356  /* interface and address parms from command line. */
357  struct iname {
358    char *name;
359    union mysockaddr addr;
360    int isloop, used;
361    struct iname *next;
362  };
363  
364  /* resolv-file parms from command-line */
365  struct resolvc {
366    struct resolvc *next;
367    int is_default, logged;
368    time_t mtime;
369    char *name;
370  };
371  
372  /* adn-hosts parms from command-line */
373  #define AH_DIR      1
374  #define AH_INACTIVE 2
375  struct hostsfile {
376    struct hostsfile *next;
377    int flags;
378    char *fname;
379    int index; /* matches to cache entries for logging */
380  };
381  
382  struct frec {
383    union mysockaddr source;
384    struct all_addr dest;
385    struct server *sentto; /* NULL means free */
386    struct randfd *rfd4;
387  #ifdef HAVE_IPV6
388    struct randfd *rfd6;
389  #endif
390    unsigned int iface;
391    unsigned short orig_id, new_id;
392    int fd, forwardall;
393    unsigned int crc;
394    time_t time;
395    struct frec *next;
396  };
397  
398  /* actions in the daemon->helper RPC */
399  #define ACTION_DEL           1
400  #define ACTION_OLD_HOSTNAME  2
401  #define ACTION_OLD           3
402  #define ACTION_ADD           4
403  
404  #define DHCP_CHADDR_MAX 16
405  
406  struct dhcp_lease {
407    int clid_len;          /* length of client identifier */
408    unsigned char *clid;   /* clientid */
409    char *hostname, *fqdn; /* name from client-hostname option or config */
410    char *old_hostname;    /* hostname before it moved to another lease */
411    char auth_name;        /* hostname came from config, not from client */
412    char new;              /* newly created */
413    char changed;          /* modified */
414    char aux_changed;      /* CLID or expiry changed */
415    time_t expires;        /* lease expiry */
416  #ifdef HAVE_BROKEN_RTC
417    unsigned int length;
418  #endif
419    int hwaddr_len, hwaddr_type;
420    unsigned char hwaddr[DHCP_CHADDR_MAX];
421    struct in_addr addr, override, giaddr;
422    unsigned char *vendorclass, *userclass, *supplied_hostname;
423    unsigned int vendorclass_len, userclass_len, supplied_hostname_len;
424    int last_interface;
425    struct dhcp_lease *next;
426  };
427  
428  struct dhcp_netid {
429    char *net;
430    struct dhcp_netid *next;
431  };
432  
433  struct dhcp_netid_list {
434    struct dhcp_netid *list;
435    struct dhcp_netid_list *next;
436  };
437  
438  struct hwaddr_config {
439    int hwaddr_len, hwaddr_type;
440    unsigned char hwaddr[DHCP_CHADDR_MAX];
441    unsigned int wildcard_mask;
442    struct hwaddr_config *next;
443  };
444  
445  struct dhcp_config {
446    unsigned int flags;
447    int clid_len;          /* length of client identifier */
448    unsigned char *clid;   /* clientid */
449    char *hostname, *domain;
450    struct dhcp_netid netid;
451    struct in_addr addr;
452    time_t decline_time;
453    unsigned int lease_time;
454    struct hwaddr_config *hwaddr;
455    struct dhcp_config *next;
456  };
457  
458  #define CONFIG_DISABLE           1
459  #define CONFIG_CLID              2
460  #define CONFIG_TIME              8
461  #define CONFIG_NAME             16
462  #define CONFIG_ADDR             32
463  #define CONFIG_NETID            64
464  #define CONFIG_NOCLID          128
465  #define CONFIG_FROM_ETHERS     256    /* entry created by /etc/ethers */
466  #define CONFIG_ADDR_HOSTS      512    /* address added by from /etc/hosts */
467  #define CONFIG_DECLINED       1024    /* address declined by client */
468  #define CONFIG_BANK           2048    /* from dhcp hosts file */
469  
470  struct dhcp_opt {
471    int opt, len, flags;
472    union {
473      int encap;
474      unsigned int wildcard_mask;
475      unsigned char *vendor_class;
476    } u;
477    unsigned char *val;
478    struct dhcp_netid *netid;
479    struct dhcp_opt *next;
480  };
481  
482  #define DHOPT_ADDR               1
483  #define DHOPT_STRING             2
484  #define DHOPT_ENCAPSULATE        4
485  #define DHOPT_ENCAP_MATCH        8
486  #define DHOPT_FORCE             16
487  #define DHOPT_BANK              32
488  #define DHOPT_ENCAP_DONE        64
489  #define DHOPT_MATCH            128
490  #define DHOPT_VENDOR           256
491  #define DHOPT_HEX              512
492  #define DHOPT_VENDOR_MATCH    1024
493  
494  struct dhcp_boot {
495    char *file, *sname;
496    struct in_addr next_server;
497    struct dhcp_netid *netid;
498    struct dhcp_boot *next;
499  };
500  
501  struct pxe_service {
502    unsigned short CSA, type;
503    char *menu, *basename;
504    struct in_addr server;
505    struct dhcp_netid *netid;
506    struct pxe_service *next;
507  };
508  
509  #define MATCH_VENDOR     1
510  #define MATCH_USER       2
511  #define MATCH_CIRCUIT    3
512  #define MATCH_REMOTE     4
513  #define MATCH_SUBSCRIBER 5
514  
515  /* vendorclass, userclass, remote-id or cicuit-id */
516  struct dhcp_vendor {
517    int len, match_type, option;
518    char *data;
519    struct dhcp_netid netid;
520    struct dhcp_vendor *next;
521  };
522  
523  struct dhcp_mac {
524    unsigned int mask;
525    int hwaddr_len, hwaddr_type;
526    unsigned char hwaddr[DHCP_CHADDR_MAX];
527    struct dhcp_netid netid;
528    struct dhcp_mac *next;
529  };
530  
531  struct dhcp_bridge {
532    char iface[IF_NAMESIZE];
533    struct dhcp_bridge *alias, *next;
534  };
535  
536  struct cond_domain {
537    char *domain;
538    struct in_addr start, end;
539    struct cond_domain *next;
540  };
541  
542  struct dhcp_context {
543    unsigned int lease_time, addr_epoch;
544    struct in_addr netmask, broadcast;
545    struct in_addr local, router;
546    struct in_addr start, end; /* range of available addresses */
547    int flags;
548    struct dhcp_netid netid, *filter;
549    struct dhcp_context *next, *current;
550  };
551  
552  #define CONTEXT_STATIC    1
553  #define CONTEXT_NETMASK   2
554  #define CONTEXT_BRDCAST   4
555  #define CONTEXT_PROXY     8
556  
557  
558  typedef unsigned char u8;
559  typedef unsigned short u16;
560  typedef unsigned int u32;
561  
562  
563  struct dhcp_packet {
564    u8 op, htype, hlen, hops;
565    u32 xid;
566    u16 secs, flags;
567    struct in_addr ciaddr, yiaddr, siaddr, giaddr;
568    u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128];
569    u8 options[312];
570  };
571  
572  struct ping_result {
573    struct in_addr addr;
574    time_t time;
575    struct ping_result *next;
576  };
577  
578  struct tftp_file {
579    int refcount, fd;
580    off_t size;
581    dev_t dev;
582    ino_t inode;
583    char filename[];
584  };
585  
586  struct tftp_transfer {
587    int sockfd;
588    time_t timeout;
589    int backoff;
590    unsigned int block, blocksize, expansion;
591    off_t offset;
592    struct sockaddr_in peer;
593    char opt_blocksize, opt_transize, netascii, carrylf;
594    struct tftp_file *file;
595    struct tftp_transfer *next;
596  };
597  
598  extern struct daemon {
599    /* datastuctures representing the command-line and
600       config file arguments. All set (including defaults)
601       in option.c */
602  
603    unsigned int options;
604    struct resolvc default_resolv, *resolv_files;
605    time_t last_resolv;
606    struct mx_srv_record *mxnames;
607    struct naptr *naptr;
608    struct txt_record *txt;
609    struct ptr_record *ptr;
610    struct cname *cnames;
611    struct interface_name *int_names;
612    char *mxtarget;
613    char *lease_file;
614    char *username, *groupname, *scriptuser;
615    int group_set, osport;
616    char *domain_suffix;
617    struct cond_domain *cond_domain;
618    char *runfile;
619    char *lease_change_command;
620    struct iname *if_names, *if_addrs, *if_except, *dhcp_except;
621    struct bogus_addr *bogus_addr;
622    struct server *servers;
623    int log_fac; /* log facility */
624    char *log_file; /* optional log file */
625    int max_logs;  /* queue limit */
626    int cachesize, ftabsize;
627    int port, query_port, min_port;
628    unsigned long local_ttl, neg_ttl;
629    struct hostsfile *addn_hosts;
630    struct dhcp_context *dhcp;
631    struct dhcp_config *dhcp_conf;
632    struct dhcp_opt *dhcp_opts, *dhcp_match;
633    struct dhcp_vendor *dhcp_vendors;
634    struct dhcp_mac *dhcp_macs;
635    struct dhcp_boot *boot_config;
636    struct pxe_service *pxe_services;
637    int enable_pxe;
638    struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic;
639    char *dhcp_hosts_file, *dhcp_opts_file;
640    int dhcp_max, tftp_max;
641    int dhcp_server_port, dhcp_client_port;
642    int start_tftp_port, end_tftp_port;
643    unsigned int min_leasetime;
644    struct doctor *doctors;
645    unsigned short edns_pktsz;
646    char *tftp_prefix;
647  
648    /* globally used stuff for DNS */
649    char *packet; /* packet buffer */
650    int packet_buff_sz; /* size of above */
651    char *namebuff; /* MAXDNAME size buffer */
652    unsigned int local_answer, queries_forwarded;
653    struct frec *frec_list;
654    struct serverfd *sfds;
655    struct irec *interfaces;
656    struct listener *listeners;
657    struct server *last_server;
658    time_t forwardtime;
659    int forwardcount;
660    struct server *srv_save; /* Used for resend on DoD */
661    size_t packet_len;       /*      "        "        */
662    struct randfd *rfd_save; /*      "        "        */
663    pid_t tcp_pids[MAX_PROCS];
664    struct randfd randomsocks[RANDOM_SOCKS];
665  
666    /* DHCP state */
667    int dhcpfd, helperfd;
668  #if defined(HAVE_LINUX_NETWORK)
669    int netlinkfd;
670  #elif defined(HAVE_BSD_NETWORK)
671    int dhcp_raw_fd, dhcp_icmp_fd;
672  #endif
673    struct iovec dhcp_packet;
674    char *dhcp_buff, *dhcp_buff2;
675    struct ping_result *ping_results;
676    FILE *lease_stream;
677    struct dhcp_bridge *bridges;
678  
679    /* DBus stuff */
680    /* void * here to avoid depending on dbus headers outside dbus.c */
681    void *dbus;
682  #ifdef HAVE_DBUS
683    struct watch *watches;
684  #endif
685  
686    /* TFTP stuff */
687    struct tftp_transfer *tftp_trans;
688  
689  } *daemon;
690  
691  /* cache.c */
692  void cache_init(void);
693  void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg);
694  char *record_source(int index);
695  void querystr(char *str, unsigned short type);
696  struct crec *cache_find_by_addr(struct crec *crecp,
697  				struct all_addr *addr, time_t now,
698  				unsigned short prot);
699  struct crec *cache_find_by_name(struct crec *crecp,
700  				char *name, time_t now, unsigned short  prot);
701  void cache_end_insert(void);
702  void cache_start_insert(void);
703  struct crec *cache_insert(char *name, struct all_addr *addr,
704  			  time_t now, unsigned long ttl, unsigned short flags);
705  void cache_reload(void);
706  void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd);
707  void cache_unhash_dhcp(void);
708  void dump_cache(time_t now);
709  char *cache_get_name(struct crec *crecp);
710  char *get_domain(struct in_addr addr);
711  
712  /* rfc1035.c */
713  unsigned short extract_request(HEADER *header, size_t qlen,
714  			       char *name, unsigned short *typep);
715  size_t setup_reply(HEADER *header, size_t  qlen,
716  		   struct all_addr *addrp, unsigned short flags,
717  		   unsigned long local_ttl);
718  int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now);
719  size_t answer_request(HEADER *header, char *limit, size_t qlen,
720  		   struct in_addr local_addr, struct in_addr local_netmask, time_t now);
721  int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name,
722  			     struct bogus_addr *addr, time_t now);
723  unsigned char *find_pseudoheader(HEADER *header, size_t plen,
724  				 size_t *len, unsigned char **p, int *is_sign);
725  int check_for_local_domain(char *name, time_t now);
726  unsigned int questions_crc(HEADER *header, size_t plen, char *buff);
727  size_t resize_packet(HEADER *header, size_t plen,
728  		  unsigned char *pheader, size_t hlen);
729  
730  /* util.c */
731  void rand_init(void);
732  unsigned short rand16(void);
733  int legal_hostname(char *c);
734  char *canonicalise(char *s, int *nomem);
735  unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
736  void *safe_malloc(size_t size);
737  void safe_pipe(int *fd, int read_noblock);
738  void *whine_malloc(size_t size);
739  int sa_len(union mysockaddr *addr);
740  int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
741  int hostname_isequal(char *a, char *b);
742  time_t dnsmasq_time(void);
743  int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
744  int retry_send(void);
745  void prettyprint_time(char *buf, unsigned int t);
746  int prettyprint_addr(union mysockaddr *addr, char *buf);
747  int parse_hex(char *in, unsigned char *out, int maxlen,
748  	      unsigned int *wildcard_mask, int *mac_type);
749  int memcmp_masked(unsigned char *a, unsigned char *b, int len,
750  		  unsigned int mask);
751  int expand_buf(struct iovec *iov, size_t size);
752  char *print_mac(char *buff, unsigned char *mac, int len);
753  void bump_maxfd(int fd, int *max);
754  int read_write(int fd, unsigned char *packet, int size, int rw);
755  
756  /* log.c */
757  void die(char *message, char *arg1, int exit_code);
758  int log_start(struct passwd *ent_pw, int errfd);
759  int log_reopen(char *log_file);
760  void my_syslog(int priority, const char *format, ...);
761  void set_log_writer(fd_set *set, int *maxfdp);
762  void check_log_writer(fd_set *set);
763  void flush_log(void);
764  
765  /* option.c */
766  void read_opts (int argc, char **argv, char *compile_opts);
767  char *option_string(unsigned char opt, int *is_ip, int *is_name);
768  void reread_dhcp(void);
769  
770  /* forward.c */
771  void reply_query(int fd, int family, time_t now);
772  void receive_query(struct listener *listen, time_t now);
773  unsigned char *tcp_request(int confd, time_t now,
774  			   struct in_addr local_addr, struct in_addr netmask);
775  void server_gone(struct server *server);
776  struct frec *get_new_frec(time_t now, int *wait);
777  
778  /* network.c */
779  int indextoname(int fd, int index, char *name);
780  int local_bind(int fd, union mysockaddr *addr, char *intname, uint32_t mark, int is_tcp);
781  int random_sock(int family);
782  void pre_allocate_sfds(void);
783  int reload_servers(char *fname);
784  #ifdef __ANDROID__
785  int set_servers(const char *servers);
786  void set_interfaces(const char *interfaces);
787  #endif
788  void check_servers(void);
789  int enumerate_interfaces();
790  struct listener *create_wildcard_listeners(void);
791  struct listener *create_bound_listeners(void);
792  int iface_check(int family, struct all_addr *addr, char *name, int *indexp);
793  int fix_fd(int fd);
794  struct in_addr get_ifaddr(char *intr);
795  
796  /* dhcp.c */
797  #ifdef HAVE_DHCP
798  void dhcp_init(void);
799  void dhcp_packet(time_t now);
800  struct dhcp_context *address_available(struct dhcp_context *context,
801  				       struct in_addr addr,
802  				       struct dhcp_netid *netids);
803  struct dhcp_context *narrow_context(struct dhcp_context *context,
804  				    struct in_addr taddr,
805  				    struct dhcp_netid *netids);
806  int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context,
807  		     struct in_addr *addrp, unsigned char *hwaddr, int hw_len,
808  		     struct dhcp_netid *netids, time_t now);
809  int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
810  struct dhcp_config *find_config(struct dhcp_config *configs,
811  				struct dhcp_context *context,
812  				unsigned char *clid, int clid_len,
813  				unsigned char *hwaddr, int hw_len,
814  				int hw_type, char *hostname);
815  void dhcp_update_configs(struct dhcp_config *configs);
816  void dhcp_read_ethers(void);
817  void check_dhcp_hosts(int fatal);
818  struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
819  char *strip_hostname(char *hostname);
820  char *host_from_dns(struct in_addr addr);
821  char *get_domain(struct in_addr addr);
822  #endif
823  
824  /* lease.c */
825  #ifdef HAVE_DHCP
826  void lease_update_file(time_t now);
827  void lease_update_dns();
828  void lease_init(time_t now);
829  struct dhcp_lease *lease_allocate(struct in_addr addr);
830  void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
831  		      unsigned char *clid, int hw_len, int hw_type, int clid_len);
832  void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth);
833  void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
834  void lease_set_interface(struct dhcp_lease *lease, int interface);
835  struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,
836  					unsigned char *clid, int clid_len);
837  struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
838  void lease_prune(struct dhcp_lease *target, time_t now);
839  void lease_update_from_configs(void);
840  int do_script_run(time_t now);
841  void rerun_scripts(void);
842  #endif
843  
844  /* rfc2131.c */
845  #ifdef HAVE_DHCP
846  size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
847  		  size_t sz, time_t now, int unicast_dest, int *is_inform);
848  unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
849  			       int clid_len, unsigned char *clid, int *len_out);
850  #endif
851  
852  /* dnsmasq.c */
853  #ifdef HAVE_DHCP
854  int make_icmp_sock(void);
855  int icmp_ping(struct in_addr addr);
856  #endif
857  void send_event(int fd, int event, int data);
858  void clear_cache_and_reload(time_t now);
859  
860  /* netlink.c */
861  #ifdef HAVE_LINUX_NETWORK
862  void netlink_init(void);
863  void netlink_multicast(void);
864  #endif
865  
866  /* bpf.c */
867  #ifdef HAVE_BSD_NETWORK
868  void init_bpf(void);
869  void send_via_bpf(struct dhcp_packet *mess, size_t len,
870  		  struct in_addr iface_addr, struct ifreq *ifr);
871  #endif
872  
873  /* bpf.c or netlink.c */
874  int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)());
875  
876  /* dbus.c */
877  #ifdef HAVE_DBUS
878  char *dbus_init(void);
879  void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset);
880  void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset);
881  void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname);
882  #endif
883  
884  /* helper.c */
885  #if defined(HAVE_DHCP) && !defined(NO_FORK)
886  int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
887  void helper_write(void);
888  void queue_script(int action, struct dhcp_lease *lease,
889  		  char *hostname, time_t now);
890  int helper_buf_empty(void);
891  #endif
892  
893  /* tftp.c */
894  #ifdef HAVE_TFTP
895  void tftp_request(struct listener *listen, time_t now);
896  void check_tftp_listeners(fd_set *rset, time_t now);
897  #endif
898