[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 */

/* for pselect.... */
#define _XOPEN_SOURCE 600
/* but then DNS headers don't compile without.... */
#define _BSD_SOURCE

/* 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 <netinet/in.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 <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>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef HAVE_PF_PACKET
#include <netpacket/packet.h>
#endif
#ifdef HAVE_BPF
#include <net/bpf.h>
#include <net/if_dl.h>
#endif
#include <sys/uio.h>

#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

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;
};

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; 
};

/* linked list of all the interfaces in the system and 
   the sockets we have bound to each one. */
struct irec {
  union mysockaddr addr;
  int fd;
  int valid;
  struct irec *next;
};

/* interface and address parms from command line. */
struct iname {
  char *name;
  union mysockaddr addr;
  int found;
  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 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 {
  unsigned char opt;
  unsigned char len;
  unsigned char *val;
  struct dhcp_opt *next;
 };

struct dhcp_context {
  int fd, rawfd, ifindex;
  char *iface;
  unsigned char hwaddr[ETHER_ADDR_LEN];
  unsigned int lease_time;
  struct in_addr serv_addr, netmask, broadcast;
  struct in_addr start, end, last; /* range of available addresses */
  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);
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);

/* 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);

/* forward.c */
void forward_init(int first);
void reap_forward(int fd);
struct server *forward_query(int udpfd, union mysockaddr *udpaddr, HEADER *header, 
			     int plen, unsigned int options, char *dnamebuff, 
			     struct server *servers, struct server *last_server,
			     time_t now, unsigned long local_ttl);
struct server *reply_query(int fd, int options, char *packet, time_t now,
			   char *dnamebuff, struct server *last_server, 
			   struct bogus_addr *bogus_nxdomain);

/* 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);
char *enumerate_interfaces(struct irec **interfaces,
			   struct iname *names, 
			   struct iname *addrs, 
			   struct iname *except,
			   struct dhcp_context *dhcp,
			   int port);

/* dhcp.c */
void dhcp_packet(struct dhcp_context *context, 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 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);

/* lease.c */
void lease_update_dns(int force_dns);
int lease_init(char *lease_file, char *domain, char *buff, 
	       char *buff2, time_t now, struct dhcp_config *dhcp_configs);
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);

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