[people/ms/dnsmasq.git] / src / dnsmasq.h

/* dnsmasq is Copyright (c) 2000-2003 Simon Kelley

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 dated June, 1991.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
*/

/* Author's email: simon@thekelleys.org.uk */
 

#ifdef __linux__
/* for pselect.... */
#define _XOPEN_SOURCE 600 
/* but then DNS headers don't compile without.... */
#define _BSD_SOURCE
#endif
 
/* get these before config.h  for IPv6 stuff... */
#include <sys/types.h> 
#include <netinet/in.h>

/* get this before config.h too. */
#include <syslog.h>

#include "config.h"
 
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#if defined(__sun) || defined(__sun__)
#  include <sys/sockio.h>
#endif
#include <sys/time.h>
#include <limits.h>
#include <net/if.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <ctype.h>
#include <signal.h>
#ifdef HAVE_GETOPT_LONG
#  include <getopt.h>
#endif
#include <time.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#if defined(__OpenBSD__)
#  include <netinet/if_ether.h>
#else
#  include <net/ethernet.h>
#endif
#include <net/if_arp.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef HAVE_BPF
#  include <net/bpf.h>
#  include <net/if_dl.h>
#else
#  include <netpacket/packet.h>
#endif
#include <sys/uio.h>

/* Size: we check after adding each record, so there must be 
     memory for the largest packet, and the largest record */
#define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ

#define OPT_BOGUSPRIV      1
#define OPT_FILTER         2
#define OPT_LOG            4
#define OPT_SELFMX         8
#define OPT_NO_HOSTS       16
#define OPT_NO_POLL        32
#define OPT_DEBUG          64
#define OPT_ORDER          128
#define OPT_NO_RESOLV      256
#define OPT_EXPAND         512
#define OPT_LOCALMX        1024
#define OPT_NO_NEG         2048
#define OPT_NODOTS_LOCAL   4096
#define OPT_NOWILD         8192
#define OPT_ETHERS         16384

struct all_addr {
  union {
    struct in_addr addr4;
#ifdef HAVE_IPV6
    struct in6_addr addr6;
#endif
  } addr;
};

struct bogus_addr {
  struct in_addr addr;
  struct bogus_addr *next;
};

/* dns doctor param */
struct doctor {
  struct in_addr in, out, mask;
  struct doctor *next;
};

union bigname {
  char name[MAXDNAME];
  union bigname *next; /* freelist */
};

struct crec { 
  struct crec *next, *prev, *hash_next;
  time_t ttd; /* time to die */
  struct all_addr addr;
  unsigned short flags;
  union {
    char sname[SMALLDNAME];
    union bigname *bname;
    char *namep;
  } name;
};

#define F_IMMORTAL  1
#define F_CONFIG    2
#define F_REVERSE   4
#define F_FORWARD   8
#define F_DHCP      16 
#define F_NEG       32       
#define F_HOSTS     64
#define F_IPV4      128
#define F_IPV6      256
#define F_BIGNAME   512
#define F_UPSTREAM  1024
#define F_SERVER    2048
#define F_NXDOMAIN  4096
#define F_QUERY     8192
#define F_ADDN      16384
#define F_NOERR     32768

/* struct sockaddr is not large enough to hold any address,
   and specifically not big enough to hold and IPv6 address.
   Blech. Roll our own. */
union mysockaddr {
  struct sockaddr sa;
  struct sockaddr_in in;
#ifdef HAVE_BROKEN_SOCKADDR_IN6
  /* early versions of glibc don't include sin6_scope_id in sockaddr_in6
     but latest kernels _require_ it to be set. The choice is to have
     dnsmasq fail to compile on back-level libc or fail to run
     on latest kernels with IPv6. Or to do this: sorry that it's so gross. */
  struct my_sockaddr_in6 {
    sa_family_t     sin6_family;    /* AF_INET6 */
    uint16_t        sin6_port;      /* transport layer port # */
    uint32_t        sin6_flowinfo;  /* IPv6 traffic class & flow info */
    struct in6_addr sin6_addr;      /* IPv6 address */
    uint32_t        sin6_scope_id;  /* set of interfaces for a scope */
  } in6;
#elif defined(HAVE_IPV6)
  struct sockaddr_in6 in6;
#endif
};

#define SERV_FROM_RESOLV     1  /* 1 for servers from resolv, 0 for command line. */
#define SERV_NO_ADDR         2  /* no server, this domain is local only */
#define SERV_LITERAL_ADDRESS 4  /* addr is the answer, not the server */ 
#define SERV_HAS_SOURCE      8  /* source address specified */
#define SERV_HAS_DOMAIN     16  /* server for one domain only */
#define SERV_FOR_NODOTS     32  /* server for names with no domain part only */
#define SERV_TYPE    (SERV_HAS_DOMAIN | SERV_FOR_NODOTS)

struct serverfd {
  int fd;
  union mysockaddr source_addr;
  struct serverfd *next;
};

struct server {
  union mysockaddr addr, source_addr;
  struct serverfd *sfd; /* non-NULL if this server has its own fd bound to
			   a source port */
  char *domain; /* set if this server only handles a domain. */ 
  int flags;
  struct server *next; 
};

struct irec {
  union mysockaddr addr;
  struct irec *next;
};

struct listener {
  int fd, family;
  struct listener *next;
};

/* interface and address parms from command line. */
struct iname {
  char *name;
  union mysockaddr addr;
  struct iname *next;
};

/* resolv-file parms from command-line */
struct resolvc {
  struct resolvc *next;
  int is_default;
  int logged;
  char *name;
};

struct frec {
  union mysockaddr source;
  struct all_addr dest;
  struct server *sentto;
  unsigned short orig_id, new_id;
  int fd;
  time_t time;
  struct frec *next;
};

struct dhcp_lease {
  int clid_len;          /* length of client identifier */
  unsigned char *clid;   /* clientid */
  char *hostname, *fqdn; /* name from client-hostname option or config */
  time_t expires;        /* lease expiry */
  unsigned char hwaddr[ETHER_ADDR_LEN]; 
  struct in_addr addr;
  struct dhcp_lease *next;
};

struct dhcp_config {
  int clid_len;          /* length of client identifier */
  unsigned char *clid;   /* clientid */
  unsigned char hwaddr[ETHER_ADDR_LEN]; 
  char *hostname;
  struct in_addr addr;
  unsigned int lease_time;
  struct dhcp_config *next;
};

struct dhcp_opt {
  int opt, len, is_addr;
  unsigned char *val;
  char *netid;
  struct dhcp_opt *next;
 };

struct dhcp_context {
  unsigned int lease_time;
  struct in_addr netmask, broadcast;
  struct in_addr start, end, last; /* range of available addresses */
  char *netid;
  struct dhcp_context *next;
};

typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;


struct udp_dhcp_packet {
        struct ip ip;
        struct udphdr {
	  u16 uh_sport;               /* source port */
	  u16 uh_dport;               /* destination port */
	  u16 uh_ulen;                /* udp length */
	  u16 uh_sum;                 /* udp checksum */
	} udp;
        struct dhcp_packet {
	  u8 op, htype, hlen, hops;
	  u32 xid;
	  u16 secs, flags;
	  struct in_addr ciaddr, yiaddr, siaddr, giaddr;
	  u8 chaddr[16], sname[64], file[128];
	  u32 cookie;
	  u8 options[308];
	} data;
};


/* cache.c */
void cache_init(int cachesize, int log);
void log_query(unsigned short flags, char *name, struct all_addr *addr);
struct crec *cache_find_by_addr(struct crec *crecp,
				struct all_addr *addr, time_t now, 
				unsigned short prot);
struct crec *cache_find_by_name(struct crec *crecp, 
				char *name, time_t now, unsigned short  prot);
void cache_end_insert(void);
void cache_start_insert(void);
void cache_insert(char *name, struct all_addr *addr,
		  time_t now, unsigned long ttl, unsigned short flags);
void cache_reload(int opts, char *buff, char *domain_suffix, char *addn_hosts);
void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, 
			  time_t ttd, unsigned short flags);
void cache_unhash_dhcp(void);
void dump_cache(int debug, int size);
char *cache_get_name(struct crec *crecp);

/* rfc1035.c */
unsigned short extract_request(HEADER *header, unsigned int qlen, char *name);
int setup_reply(HEADER *header, unsigned int qlen,
		struct all_addr *addrp, unsigned short flags,
		unsigned long local_ttl);
void extract_addresses(HEADER *header, unsigned int qlen, char *namebuff, 
		       time_t now, struct doctor *doctors);
void extract_neg_addrs(HEADER *header, unsigned int qlen, char *namebuff, time_t now);
int answer_request(HEADER *header, char *limit, unsigned int qlen, char *mxname, 
		   char *mxtarget, unsigned int options, time_t now, unsigned long local_ttl,
		   char *namebuff);
int check_for_bogus_wildcard(HEADER *header, unsigned int qlen, char *name, 
			     struct bogus_addr *addr, time_t now);

/* util.c */
unsigned short rand16(void);
int legal_char(char c);
int canonicalise(char *s);
void die(char *message, char *arg1);
void complain(char *message, char *arg1);
void *safe_malloc(int size);
char *safe_string_alloc(char *cp);
int sa_len(union mysockaddr *addr);
int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
int hostname_isequal(unsigned char *a, unsigned char *b);
time_t dnsmasq_time(int fd);
/* option.c */
unsigned int read_opts(int argc, char **argv, char *buff, struct resolvc **resolv_file, 
		       char **mxname, char **mxtarget, char **lease_file, 
		       char **username, char **groupname, 
		       char **domain_suffix, char **runfile, 
		       struct iname **if_names, struct iname **if_addrs, struct iname **if_except, 
		       struct bogus_addr **bogus_addr, struct server **serv_addrs, int *cachesize, 
		       int *port, int *query_port, unsigned long *local_ttl, char **addn_hosts,
		       struct dhcp_context **dhcp, struct dhcp_config **dhcp_conf, struct dhcp_opt **opts,
		       char **dhcp_file, char **dhcp_sname, struct in_addr *dhcp_next_server,
		       int *maxleases, unsigned int *min_leasetime, struct doctor **doctors);

/* forward.c */
void forward_init(int first);
struct server *reply_query(int fd, int options, char *packet, time_t now,
			   char *dnamebuff, struct server *last_server, 
			   struct bogus_addr *bogus_nxdomain, struct doctor *doctors);

struct server *receive_query(struct listener *listen, char *packet, char *mxname, 
			     char *mxtarget, unsigned int options, time_t now, 
			     unsigned long local_ttl, char *namebuff,
			     struct iname *names, struct iname *addrs, struct iname *except,
			     struct server *last_server, struct server *servers);
/* network.c */
struct server *reload_servers(char *fname, char *buff, struct server *servers, int query_port);
struct server *check_servers(struct server *new, struct irec *interfaces, struct serverfd **sfds);
struct irec *enumerate_interfaces(struct iname *names,
				  struct iname *addrs,
				  struct iname *except,
				  int port);
struct listener *create_wildcard_listeners(int port);
struct listener *create_bound_listeners(struct irec *interfaces);
/* dhcp.c */
void dhcp_init(int *fdp, int* rfdp);
void dhcp_packet(struct dhcp_context *contexts, char *packet, 
		 struct dhcp_opt *dhcp_opts, struct dhcp_config *dhcp_configs, 
		 time_t now, char *namebuff, char *domain_suffix,
		 char *dhcp_file, char *dhcp_sname, 
		 struct in_addr dhcp_next_server, int dhcp_fd, int raw_fd,
		 struct iname *names, struct iname *addrs, struct iname *except);
int address_available(struct dhcp_context *context, struct in_addr addr);
int address_allocate(struct dhcp_context *context, struct dhcp_config *configs,
		     struct in_addr *addrp);
struct dhcp_config *find_config(struct dhcp_config *configs,
				struct dhcp_context *context,
				unsigned char *clid, int clid_len,
				unsigned char *hwaddr, char *hostname);
struct dhcp_config *read_ethers(struct dhcp_config *configs, char *buff);
void dhcp_update_configs(struct dhcp_config *configs);
struct dhcp_config *dhcp_read_ethers(struct dhcp_config *configs, char *buff);
/* lease.c */
void lease_update_file(int force, time_t now);
void lease_update_dns(void);
int lease_init(char *lease_file, char *domain, char *buff, 
	       char *buff2, time_t now, int maxleases);
struct dhcp_lease *lease_allocate(unsigned char *clid, int clid_len, struct in_addr addr);
void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr);
void lease_set_hostname(struct dhcp_lease *lease, char *name, char *suffix);
void lease_set_expires(struct dhcp_lease *lease, time_t exp);
struct dhcp_lease *lease_find_by_client(unsigned char *clid, int clid_len);
struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
void lease_prune(struct dhcp_lease *target, time_t now);
void lease_update_from_configs(struct dhcp_config *dhcp_configs, char *domain);
/* rfc2131.c */
int dhcp_reply(struct dhcp_context *context, 
	       struct in_addr iface_addr,
	       char *iface_name,
	       int iface_mtu,
	       struct udp_dhcp_packet *rawpacket,
	       unsigned int sz, time_t now, char *namebuff, 
	       struct dhcp_opt *dhcp_opts, struct dhcp_config *dhcp_configs, 
	       char *domain_suffix, char *dhcp_file, char *dhcp_sname, 
	       struct in_addr dhcp_next_server, struct in_addr router);
Commit	Line	Data
9e4abcb5 SK	1	/* dnsmasq is Copyright (c) 2000-2003 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.
	6
	7	This program is distributed in the hope that it will be useful,
	8	but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	GNU General Public License for more details.
	11	*/
	12
	13	/* Author's email: simon@thekelleys.org.uk */
44a2a316	14
9e4abcb5	15
44a2a316	16	#ifdef __linux__
9e4abcb5	17	/* for pselect.... */
44a2a316	18	#define _XOPEN_SOURCE 600
9e4abcb5 SK	19	/* but then DNS headers don't compile without.... */
9e4abcb5 SK	20	#define _BSD_SOURCE
44a2a316 SK	21	#endif
44a2a316 SK	22
9e4abcb5	23	/* get these before config.h for IPv6 stuff... */
44a2a316	24	#include <sys/types.h>
9e4abcb5 SK	25	#include <netinet/in.h>
	26
	27	/* get this before config.h too. */
	28	#include <syslog.h>
	29
	30	#include "config.h"
44a2a316	31
9e4abcb5 SK	32	#include <arpa/nameser.h>
	33	#include <arpa/inet.h>
	34	#include <sys/stat.h>
	35	#include <sys/socket.h>
	36	#include <sys/stat.h>
	37	#include <sys/ioctl.h>
	38	#include <sys/select.h>
	39	#if defined(__sun) \|\| defined(__sun__)
44a2a316	40	# include <sys/sockio.h>
9e4abcb5 SK	41	#endif
9e4abcb5 SK	42	#include <sys/time.h>
8a911ccc	43	#include <limits.h>
9e4abcb5 SK	44	#include <net/if.h>
	45	#include <unistd.h>
	46	#include <stdio.h>
	47	#include <string.h>
	48	#include <stdlib.h>
	49	#include <fcntl.h>
	50	#include <ctype.h>
	51	#include <signal.h>
	52	#ifdef HAVE_GETOPT_LONG
	53	# include <getopt.h>
	54	#endif
	55	#include <time.h>
	56	#include <errno.h>
	57	#include <pwd.h>
	58	#include <grp.h>
44a2a316 SK	59	#if defined(__OpenBSD__)
	60	# include <netinet/if_ether.h>
	61	#else
	62	# include <net/ethernet.h>
	63	#endif
9e4abcb5 SK	64	#include <net/if_arp.h>
	65	#include <netinet/in_systm.h>
	66	#include <netinet/ip.h>
9e4abcb5	67	#ifdef HAVE_BPF
44a2a316 SK	68	# include <net/bpf.h>
	69	# include <net/if_dl.h>
	70	#else
	71	# include <netpacket/packet.h>
9e4abcb5 SK	72	#endif
	73	#include <sys/uio.h>
	74
44a2a316 SK	75	/* Size: we check after adding each record, so there must be
	76	memory for the largest packet, and the largest record */
	77	#define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
	78
9e4abcb5 SK	79	#define OPT_BOGUSPRIV 1
	80	#define OPT_FILTER 2
	81	#define OPT_LOG 4
	82	#define OPT_SELFMX 8
	83	#define OPT_NO_HOSTS 16
	84	#define OPT_NO_POLL 32
	85	#define OPT_DEBUG 64
	86	#define OPT_ORDER 128
	87	#define OPT_NO_RESOLV 256
	88	#define OPT_EXPAND 512
	89	#define OPT_LOCALMX 1024
	90	#define OPT_NO_NEG 2048
	91	#define OPT_NODOTS_LOCAL 4096
44a2a316 SK	92	#define OPT_NOWILD 8192
44a2a316 SK	93	#define OPT_ETHERS 16384
9e4abcb5 SK	94
	95	struct all_addr {
	96	union {
	97	struct in_addr addr4;
	98	#ifdef HAVE_IPV6
	99	struct in6_addr addr6;
	100	#endif
	101	} addr;
	102	};
	103
	104	struct bogus_addr {
	105	struct in_addr addr;
	106	struct bogus_addr *next;
	107	};
	108
1cff166d SK	109	/* dns doctor param */
	110	struct doctor {
	111	struct in_addr in, out, mask;
	112	struct doctor *next;
	113	};
	114
9e4abcb5 SK	115	union bigname {
	116	char name[MAXDNAME];
	117	union bigname next; / freelist */
	118	};
	119
	120	struct crec {
	121	struct crec next, prev, *hash_next;
	122	time_t ttd; /* time to die */
	123	struct all_addr addr;
	124	unsigned short flags;
	125	union {
	126	char sname[SMALLDNAME];
	127	union bigname *bname;
	128	char *namep;
	129	} name;
	130	};
	131
	132	#define F_IMMORTAL 1
	133	#define F_CONFIG 2
	134	#define F_REVERSE 4
	135	#define F_FORWARD 8
	136	#define F_DHCP 16
	137	#define F_NEG 32
	138	#define F_HOSTS 64
	139	#define F_IPV4 128
	140	#define F_IPV6 256
	141	#define F_BIGNAME 512
	142	#define F_UPSTREAM 1024
	143	#define F_SERVER 2048
	144	#define F_NXDOMAIN 4096
	145	#define F_QUERY 8192
	146	#define F_ADDN 16384
	147	#define F_NOERR 32768
	148
	149	/* struct sockaddr is not large enough to hold any address,
	150	and specifically not big enough to hold and IPv6 address.
	151	Blech. Roll our own. */
	152	union mysockaddr {
	153	struct sockaddr sa;
	154	struct sockaddr_in in;
	155	#ifdef HAVE_BROKEN_SOCKADDR_IN6
	156	/* early versions of glibc don't include sin6_scope_id in sockaddr_in6
	157	but latest kernels _require_ it to be set. The choice is to have
	158	dnsmasq fail to compile on back-level libc or fail to run
	159	on latest kernels with IPv6. Or to do this: sorry that it's so gross. */
	160	struct my_sockaddr_in6 {
	161	sa_family_t sin6_family; /* AF_INET6 */
	162	uint16_t sin6_port; /* transport layer port # */
	163	uint32_t sin6_flowinfo; /* IPv6 traffic class & flow info */
	164	struct in6_addr sin6_addr; /* IPv6 address */
	165	uint32_t sin6_scope_id; /* set of interfaces for a scope */
	166	} in6;
	167	#elif defined(HAVE_IPV6)
	168	struct sockaddr_in6 in6;
	169	#endif
	170	};
	171
	172	#define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */
	173	#define SERV_NO_ADDR 2 /* no server, this domain is local only */
	174	#define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */
	175	#define SERV_HAS_SOURCE 8 /* source address specified */
	176	#define SERV_HAS_DOMAIN 16 /* server for one domain only */
	177	#define SERV_FOR_NODOTS 32 /* server for names with no domain part only */
	178	#define SERV_TYPE (SERV_HAS_DOMAIN \| SERV_FOR_NODOTS)
179
180	struct serverfd {
181	int fd;
182	union mysockaddr source_addr;
183	struct serverfd *next;
184	};
185
186	struct server {
187	union mysockaddr addr, source_addr;
188	struct serverfd sfd; / non-NULL if this server has its own fd bound to
189	a source port */
190	char domain; / set if this server only handles a domain. */
191	int flags;
192	struct server *next;
193	};
194
9e4abcb5 SK	195	struct irec {
9e4abcb5 SK	196	union mysockaddr addr;
9e4abcb5 SK	197	struct irec *next;
	198	};
	199
44a2a316 SK	200	struct listener {
	201	int fd, family;
	202	struct listener *next;
	203	};
	204
9e4abcb5 SK	205	/* interface and address parms from command line. */
	206	struct iname {
	207	char *name;
	208	union mysockaddr addr;
9e4abcb5 SK	209	struct iname *next;
	210	};
	211
	212	/* resolv-file parms from command-line */
	213	struct resolvc {
	214	struct resolvc *next;
	215	int is_default;
	216	int logged;
	217	char *name;
	218	};
	219
	220	struct frec {
	221	union mysockaddr source;
44a2a316	222	struct all_addr dest;
9e4abcb5 SK	223	struct server *sentto;
	224	unsigned short orig_id, new_id;
	225	int fd;
	226	time_t time;
	227	struct frec *next;
	228	};
	229
	230	struct dhcp_lease {
	231	int clid_len; /* length of client identifier */
	232	unsigned char clid; / clientid */
	233	char hostname, fqdn; /* name from client-hostname option or config */
	234	time_t expires; /* lease expiry */
	235	unsigned char hwaddr[ETHER_ADDR_LEN];
	236	struct in_addr addr;
	237	struct dhcp_lease *next;
	238	};
	239
	240	struct dhcp_config {
	241	int clid_len; /* length of client identifier */
	242	unsigned char clid; / clientid */
	243	unsigned char hwaddr[ETHER_ADDR_LEN];
	244	char *hostname;
	245	struct in_addr addr;
	246	unsigned int lease_time;
	247	struct dhcp_config *next;
	248	};
	249
	250	struct dhcp_opt {
1ab84e2f	251	int opt, len, is_addr;
9e4abcb5	252	unsigned char *val;
44a2a316	253	char *netid;
9e4abcb5 SK	254	struct dhcp_opt *next;
	255	};
	256
	257	struct dhcp_context {
9e4abcb5	258	unsigned int lease_time;
44a2a316	259	struct in_addr netmask, broadcast;
9e4abcb5	260	struct in_addr start, end, last; /* range of available addresses */
44a2a316	261	char *netid;
9e4abcb5 SK	262	struct dhcp_context *next;
	263	};
	264
	265	typedef unsigned char u8;
	266	typedef unsigned short u16;
	267	typedef unsigned int u32;
	268
	269
	270	struct udp_dhcp_packet {
	271	struct ip ip;
	272	struct udphdr {
	273	u16 uh_sport; /* source port */
	274	u16 uh_dport; /* destination port */
	275	u16 uh_ulen; /* udp length */
	276	u16 uh_sum; /* udp checksum */
	277	} udp;
	278	struct dhcp_packet {
	279	u8 op, htype, hlen, hops;
	280	u32 xid;
	281	u16 secs, flags;
	282	struct in_addr ciaddr, yiaddr, siaddr, giaddr;
	283	u8 chaddr[16], sname[64], file[128];
	284	u32 cookie;
	285	u8 options[308];
	286	} data;
	287	};
	288
	289
	290	/* cache.c */
	291	void cache_init(int cachesize, int log);
	292	void log_query(unsigned short flags, char name, struct all_addr addr);
	293	struct crec cache_find_by_addr(struct crec crecp,
	294	struct all_addr *addr, time_t now,
	295	unsigned short prot);
	296	struct crec cache_find_by_name(struct crec crecp,
	297	char *name, time_t now, unsigned short prot);
	298	void cache_end_insert(void);
	299	void cache_start_insert(void);
	300	void cache_insert(char name, struct all_addr addr,
	301	time_t now, unsigned long ttl, unsigned short flags);
	302	void cache_reload(int opts, char buff, char domain_suffix, char *addn_hosts);
	303	void cache_add_dhcp_entry(char host_name, struct in_addr host_address,
	304	time_t ttd, unsigned short flags);
	305	void cache_unhash_dhcp(void);
	306	void dump_cache(int debug, int size);
	307	char cache_get_name(struct crec crecp);
	308
	309	/* rfc1035.c */
	310	unsigned short extract_request(HEADER header, unsigned int qlen, char name);
	311	int setup_reply(HEADER *header, unsigned int qlen,
	312	struct all_addr *addrp, unsigned short flags,
	313	unsigned long local_ttl);
1cff166d SK	314	void extract_addresses(HEADER header, unsigned int qlen, char namebuff,
1cff166d SK	315	time_t now, struct doctor *doctors);
9e4abcb5 SK	316	void extract_neg_addrs(HEADER header, unsigned int qlen, char namebuff, time_t now);
	317	int answer_request(HEADER header, char limit, unsigned int qlen, char *mxname,
	318	char *mxtarget, unsigned int options, time_t now, unsigned long local_ttl,
	319	char *namebuff);
	320	int check_for_bogus_wildcard(HEADER header, unsigned int qlen, char name,
	321	struct bogus_addr *addr, time_t now);
	322
	323	/* util.c */
	324	unsigned short rand16(void);
	325	int legal_char(char c);
	326	int canonicalise(char *s);
	327	void die(char message, char arg1);
	328	void complain(char message, char arg1);
	329	void *safe_malloc(int size);
	330	char safe_string_alloc(char cp);
	331	int sa_len(union mysockaddr *addr);
	332	int sockaddr_isequal(union mysockaddr s1, union mysockaddr s2);
	333	int hostname_isequal(unsigned char a, unsigned char b);
44a2a316	334	time_t dnsmasq_time(int fd);
9e4abcb5 SK	335	/* option.c */
	336	unsigned int read_opts(int argc, char *argv, char buff, struct resolvc **resolv_file,
	337	char mxname, char mxtarget, char **lease_file,
	338	char username, char groupname,
	339	char domain_suffix, char runfile,
	340	struct iname if_names, struct iname if_addrs, struct iname **if_except,
	341	struct bogus_addr bogus_addr, struct server serv_addrs, int *cachesize,
	342	int port, int query_port, unsigned long local_ttl, char *addn_hosts,
	343	struct dhcp_context dhcp, struct dhcp_config dhcp_conf, struct dhcp_opt **opts,
44a2a316	344	char dhcp_file, char dhcp_sname, struct in_addr *dhcp_next_server,
1cff166d	345	int maxleases, unsigned int min_leasetime, struct doctor **doctors);
9e4abcb5 SK	346
	347	/* forward.c */
	348	void forward_init(int first);
9e4abcb5 SK	349	struct server reply_query(int fd, int options, char packet, time_t now,
9e4abcb5 SK	350	char dnamebuff, struct server last_server,
1cff166d	351	struct bogus_addr bogus_nxdomain, struct doctor doctors);
9e4abcb5	352
44a2a316 SK	353	struct server receive_query(struct listener listen, char packet, char mxname,
	354	char *mxtarget, unsigned int options, time_t now,
	355	unsigned long local_ttl, char *namebuff,
	356	struct iname names, struct iname addrs, struct iname *except,
	357	struct server last_server, struct server servers);
9e4abcb5 SK	358	/* network.c */
	359	struct server reload_servers(char fname, char buff, struct server servers, int query_port);
	360	struct server check_servers(struct server new, struct irec interfaces, struct serverfd *sfds);
44a2a316 SK	361	struct irec enumerate_interfaces(struct iname names,
	362	struct iname *addrs,
	363	struct iname *except,
	364	int port);
	365	struct listener *create_wildcard_listeners(int port);
	366	struct listener create_bound_listeners(struct irec interfaces);
9e4abcb5	367	/* dhcp.c */
44a2a316 SK	368	void dhcp_init(int fdp, int rfdp);
	369	void dhcp_packet(struct dhcp_context contexts, char packet,
	370	struct dhcp_opt dhcp_opts, struct dhcp_config dhcp_configs,
9e4abcb5	371	time_t now, char namebuff, char domain_suffix,
44a2a316 SK	372	char dhcp_file, char dhcp_sname,
	373	struct in_addr dhcp_next_server, int dhcp_fd, int raw_fd,
	374	struct iname names, struct iname addrs, struct iname *except);
9e4abcb5 SK	375	int address_available(struct dhcp_context *context, struct in_addr addr);
	376	int address_allocate(struct dhcp_context context, struct dhcp_config configs,
	377	struct in_addr *addrp);
	378	struct dhcp_config find_config(struct dhcp_config configs,
	379	struct dhcp_context *context,
	380	unsigned char *clid, int clid_len,
	381	unsigned char hwaddr, char hostname);
44a2a316 SK	382	struct dhcp_config read_ethers(struct dhcp_config configs, char *buff);
	383	void dhcp_update_configs(struct dhcp_config *configs);
	384	struct dhcp_config dhcp_read_ethers(struct dhcp_config configs, char *buff);
9e4abcb5	385	/* lease.c */
44a2a316 SK	386	void lease_update_file(int force, time_t now);
44a2a316 SK	387	void lease_update_dns(void);
9e4abcb5	388	int lease_init(char lease_file, char domain, char *buff,
44a2a316	389	char *buff2, time_t now, int maxleases);
9e4abcb5 SK	390	struct dhcp_lease lease_allocate(unsigned char clid, int clid_len, struct in_addr addr);
	391	void lease_set_hwaddr(struct dhcp_lease lease, unsigned char hwaddr);
	392	void lease_set_hostname(struct dhcp_lease lease, char name, char *suffix);
	393	void lease_set_expires(struct dhcp_lease *lease, time_t exp);
	394	struct dhcp_lease lease_find_by_client(unsigned char clid, int clid_len);
	395	struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
	396	void lease_prune(struct dhcp_lease *target, time_t now);
44a2a316	397	void lease_update_from_configs(struct dhcp_config dhcp_configs, char domain);
9e4abcb5	398	/* rfc2131.c */
44a2a316 SK	399	int dhcp_reply(struct dhcp_context *context,
	400	struct in_addr iface_addr,
	401	char *iface_name,
	402	int iface_mtu,
	403	struct udp_dhcp_packet *rawpacket,
9e4abcb5	404	unsigned int sz, time_t now, char *namebuff,
44a2a316	405	struct dhcp_opt dhcp_opts, struct dhcp_config dhcp_configs,
9e4abcb5	406	char domain_suffix, char dhcp_file, char *dhcp_sname,
8a911ccc	407	struct in_addr dhcp_next_server, struct in_addr router);
44a2a316	408