[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 */

#define COPYRIGHT "Copyright (C) 2000-2004 Simon Kelley" 

#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>
#include <sys/wait.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__) || defined(__NetBSD__)
#  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
#define OPT_RESOLV_DOMAIN  32768

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;
};

struct mx_record {
  char *mxname, *mxtarget;
  struct mx_record *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, tcpfd;
  struct server *next; 
};

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

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

/* interface and address parms from command line. */
struct iname {
  char *name;
  union mysockaddr addr;
  int isloop, used;
  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 int iface;
  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_netid {
  char *net;
  struct dhcp_netid *next;
};

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

#define CONFIG_DISABLE   1
#define CONFIG_CLID      2
#define CONFIG_HWADDR    4
#define CONFIG_TIME      8
#define CONFIG_NAME     16
#define CONFIG_ADDR     32
#define CONFIG_NETID    64
#define CONFIG_NOCLID  128

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

struct dhcp_vendor {
  int len, is_vendor, used;
  char *data;
  struct dhcp_netid netid;
  struct dhcp_vendor *next;
};

struct dhcp_context {
  unsigned int lease_time, addr_epoch;
  struct in_addr netmask, broadcast;
  struct in_addr start, end; /* range of available addresses */
  struct dhcp_netid 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, unsigned short type);
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);
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, unsigned short *typep);
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, struct mx_record *mxnames,
		   char *mxtarget, unsigned int options, time_t now, unsigned long local_ttl,
		   char *namebuff, unsigned short edns_pcktsz);
int check_for_bogus_wildcard(HEADER *header, unsigned int qlen, char *name, 
			     struct bogus_addr *addr, time_t now);
unsigned char *find_pseudoheader(HEADER *header, unsigned int plen);

/* util.c */
unsigned short rand16(void);
int legal_char(char c);
int canonicalise(char *s);
int atoi_check(char *a, int *res);
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);
int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);

/* option.c */
unsigned int read_opts(int argc, char **argv, char *buff, struct resolvc **resolv_file, 
		       struct mx_record **mxnames, 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, struct dhcp_vendor **dhcp_vendors,
		       char **dhcp_file, char **dhcp_sname, struct in_addr *dhcp_next_server,
		       int *maxleases, unsigned int *min_leasetime, struct doctor **doctors,
		       unsigned short *edns_pktsz);

/* forward.c */
void forward_init(int first);
struct server *reply_query(struct serverfd *sfd, int options, char *packet, time_t now,
			   char *dnamebuff, struct server *servers, struct server *last_server, 
			   struct bogus_addr *bogus_nxdomain, 
			   struct doctor *doctors, unsigned short edns_pcktsz);

struct server *receive_query(struct listener *listen, char *packet, struct mx_record *mxnames, 
			     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, unsigned short edns_pcktsz);

char *tcp_request(int confd, struct mx_record *mxnames, 
		  char *mxtarget, unsigned int options, time_t now, 
		  unsigned long local_ttl, char *namebuff,
		  struct server *last_server, struct server *servers,
		  struct bogus_addr *bogus_nxdomain, struct doctor *doctors,
		  unsigned short edns_pcktsz);
/* network.c */
struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds);
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, int port);
/* dhcp.c */
void dhcp_init(int *fdp, int* rfdp, struct dhcp_config *configs);
void dhcp_packet(struct dhcp_context *contexts, char *packet, 
		 struct dhcp_opt *dhcp_opts, struct dhcp_config *dhcp_configs, 
		 struct dhcp_vendor *vendors,
		 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, unsigned char *hwaddr);
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);
struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
/* 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, 
	       struct dhcp_vendor *vendors,
	       char *domain_suffix, char *dhcp_file, char *dhcp_sname, 
	       struct in_addr dhcp_next_server, struct in_addr router);

/* isc.c */
#ifdef HAVE_ISC_READER
void load_dhcp(char *file, char *suffix, time_t now, char *hostname);
#endif
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 */
feba5c1d SK	14
feba5c1d SK	15	#define COPYRIGHT "Copyright (C) 2000-2004 Simon Kelley"
9e4abcb5	16
44a2a316	17	#ifdef __linux__
9e4abcb5	18	/* for pselect.... */
44a2a316	19	#define _XOPEN_SOURCE 600
9e4abcb5 SK	20	/* but then DNS headers don't compile without.... */
9e4abcb5 SK	21	#define _BSD_SOURCE
44a2a316 SK	22	#endif
44a2a316 SK	23
9e4abcb5	24	/* get these before config.h for IPv6 stuff... */
44a2a316	25	#include <sys/types.h>
9e4abcb5 SK	26	#include <netinet/in.h>
	27
	28	/* get this before config.h too. */
	29	#include <syslog.h>
	30
	31	#include "config.h"
44a2a316	32
9e4abcb5 SK	33	#include <arpa/nameser.h>
	34	#include <arpa/inet.h>
	35	#include <sys/stat.h>
	36	#include <sys/socket.h>
	37	#include <sys/stat.h>
	38	#include <sys/ioctl.h>
	39	#include <sys/select.h>
feba5c1d	40	#include <sys/wait.h>
9e4abcb5	41	#if defined(__sun) \|\| defined(__sun__)
44a2a316	42	# include <sys/sockio.h>
9e4abcb5 SK	43	#endif
9e4abcb5 SK	44	#include <sys/time.h>
8a911ccc	45	#include <limits.h>
9e4abcb5 SK	46	#include <net/if.h>
	47	#include <unistd.h>
	48	#include <stdio.h>
	49	#include <string.h>
	50	#include <stdlib.h>
	51	#include <fcntl.h>
	52	#include <ctype.h>
	53	#include <signal.h>
	54	#ifdef HAVE_GETOPT_LONG
	55	# include <getopt.h>
	56	#endif
	57	#include <time.h>
	58	#include <errno.h>
	59	#include <pwd.h>
	60	#include <grp.h>
de37951c	61	#if defined(__OpenBSD__) \|\| defined(__NetBSD__)
44a2a316 SK	62	# include <netinet/if_ether.h>
	63	#else
	64	# include <net/ethernet.h>
	65	#endif
9e4abcb5 SK	66	#include <net/if_arp.h>
	67	#include <netinet/in_systm.h>
	68	#include <netinet/ip.h>
9e4abcb5	69	#ifdef HAVE_BPF
44a2a316 SK	70	# include <net/bpf.h>
	71	# include <net/if_dl.h>
	72	#else
	73	# include <netpacket/packet.h>
9e4abcb5 SK	74	#endif
	75	#include <sys/uio.h>
	76
44a2a316 SK	77	/* Size: we check after adding each record, so there must be
	78	memory for the largest packet, and the largest record */
	79	#define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ
	80
9e4abcb5 SK	81	#define OPT_BOGUSPRIV 1
	82	#define OPT_FILTER 2
	83	#define OPT_LOG 4
	84	#define OPT_SELFMX 8
	85	#define OPT_NO_HOSTS 16
	86	#define OPT_NO_POLL 32
	87	#define OPT_DEBUG 64
	88	#define OPT_ORDER 128
	89	#define OPT_NO_RESOLV 256
	90	#define OPT_EXPAND 512
	91	#define OPT_LOCALMX 1024
	92	#define OPT_NO_NEG 2048
	93	#define OPT_NODOTS_LOCAL 4096
44a2a316 SK	94	#define OPT_NOWILD 8192
44a2a316 SK	95	#define OPT_ETHERS 16384
de37951c	96	#define OPT_RESOLV_DOMAIN 32768
9e4abcb5 SK	97
	98	struct all_addr {
	99	union {
	100	struct in_addr addr4;
	101	#ifdef HAVE_IPV6
	102	struct in6_addr addr6;
	103	#endif
	104	} addr;
	105	};
	106
	107	struct bogus_addr {
	108	struct in_addr addr;
	109	struct bogus_addr *next;
	110	};
	111
1cff166d SK	112	/* dns doctor param */
	113	struct doctor {
	114	struct in_addr in, out, mask;
	115	struct doctor *next;
	116	};
	117
de37951c SK	118	struct mx_record {
	119	char mxname, mxtarget;
	120	struct mx_record *next;
	121	};
	122
9e4abcb5 SK	123	union bigname {
	124	char name[MAXDNAME];
	125	union bigname next; / freelist */
	126	};
	127
	128	struct crec {
	129	struct crec next, prev, *hash_next;
	130	time_t ttd; /* time to die */
	131	struct all_addr addr;
	132	unsigned short flags;
	133	union {
	134	char sname[SMALLDNAME];
	135	union bigname *bname;
	136	char *namep;
	137	} name;
	138	};
	139
	140	#define F_IMMORTAL 1
a84fa1d0	141	#define F_CONFIG 2
9e4abcb5 SK	142	#define F_REVERSE 4
	143	#define F_FORWARD 8
	144	#define F_DHCP 16
	145	#define F_NEG 32
	146	#define F_HOSTS 64
	147	#define F_IPV4 128
	148	#define F_IPV6 256
	149	#define F_BIGNAME 512
	150	#define F_UPSTREAM 1024
	151	#define F_SERVER 2048
	152	#define F_NXDOMAIN 4096
	153	#define F_QUERY 8192
	154	#define F_ADDN 16384
	155	#define F_NOERR 32768
	156
	157	/* struct sockaddr is not large enough to hold any address,
	158	and specifically not big enough to hold and IPv6 address.
	159	Blech. Roll our own. */
	160	union mysockaddr {
	161	struct sockaddr sa;
	162	struct sockaddr_in in;
	163	#ifdef HAVE_BROKEN_SOCKADDR_IN6
	164	/* early versions of glibc don't include sin6_scope_id in sockaddr_in6
	165	but latest kernels _require_ it to be set. The choice is to have
	166	dnsmasq fail to compile on back-level libc or fail to run
	167	on latest kernels with IPv6. Or to do this: sorry that it's so gross. */
	168	struct my_sockaddr_in6 {
	169	sa_family_t sin6_family; /* AF_INET6 */
	170	uint16_t sin6_port; /* transport layer port # */
	171	uint32_t sin6_flowinfo; /* IPv6 traffic class & flow info */
	172	struct in6_addr sin6_addr; /* IPv6 address */
	173	uint32_t sin6_scope_id; /* set of interfaces for a scope */
	174	} in6;
	175	#elif defined(HAVE_IPV6)
	176	struct sockaddr_in6 in6;
	177	#endif
	178	};
	179
	180	#define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */
	181	#define SERV_NO_ADDR 2 /* no server, this domain is local only */
	182	#define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */
	183	#define SERV_HAS_SOURCE 8 /* source address specified */
	184	#define SERV_HAS_DOMAIN 16 /* server for one domain only */
	185	#define SERV_FOR_NODOTS 32 /* server for names with no domain part only */
	186	#define SERV_TYPE (SERV_HAS_DOMAIN \| SERV_FOR_NODOTS)
	187
	188	struct serverfd {
	189	int fd;
	190	union mysockaddr source_addr;
	191	struct serverfd *next;
	192	};
	193
	194	struct server {
	195	union mysockaddr addr, source_addr;
	196	struct serverfd sfd; / non-NULL if this server has its own fd bound to
	197	a source port */
	198	char domain; / set if this server only handles a domain. */
feba5c1d	199	int flags, tcpfd;
9e4abcb5 SK	200	struct server *next;
	201	};
	202
9e4abcb5 SK	203	struct irec {
9e4abcb5 SK	204	union mysockaddr addr;
9e4abcb5 SK	205	struct irec *next;
	206	};
	207
44a2a316	208	struct listener {
feba5c1d	209	int fd, tcpfd, family;
44a2a316 SK	210	struct listener *next;
	211	};
	212
9e4abcb5 SK	213	/* interface and address parms from command line. */
	214	struct iname {
	215	char *name;
	216	union mysockaddr addr;
de37951c	217	int isloop, used;
9e4abcb5 SK	218	struct iname *next;
	219	};
	220
	221	/* resolv-file parms from command-line */
	222	struct resolvc {
	223	struct resolvc *next;
	224	int is_default;
	225	int logged;
	226	char *name;
	227	};
	228
	229	struct frec {
	230	union mysockaddr source;
44a2a316	231	struct all_addr dest;
9e4abcb5	232	struct server *sentto;
dfa666f2	233	unsigned int iface;
9e4abcb5 SK	234	unsigned short orig_id, new_id;
	235	int fd;
	236	time_t time;
	237	struct frec *next;
	238	};
	239
	240	struct dhcp_lease {
	241	int clid_len; /* length of client identifier */
	242	unsigned char clid; / clientid */
	243	char hostname, fqdn; /* name from client-hostname option or config */
	244	time_t expires; /* lease expiry */
	245	unsigned char hwaddr[ETHER_ADDR_LEN];
	246	struct in_addr addr;
	247	struct dhcp_lease *next;
	248	};
	249
a222641c SK	250	struct dhcp_netid {
	251	char *net;
	252	struct dhcp_netid *next;
	253	};
	254
9e4abcb5	255	struct dhcp_config {
33820b7e	256	unsigned int flags;
9e4abcb5 SK	257	int clid_len; /* length of client identifier */
	258	unsigned char clid; / clientid */
	259	unsigned char hwaddr[ETHER_ADDR_LEN];
a222641c SK	260	char *hostname;
a222641c SK	261	struct dhcp_netid netid;
9e4abcb5 SK	262	struct in_addr addr;
	263	unsigned int lease_time;
	264	struct dhcp_config *next;
	265	};
	266
33820b7e SK	267	#define CONFIG_DISABLE 1
	268	#define CONFIG_CLID 2
	269	#define CONFIG_HWADDR 4
	270	#define CONFIG_TIME 8
	271	#define CONFIG_NAME 16
	272	#define CONFIG_ADDR 32
	273	#define CONFIG_NETID 64
a84fa1d0	274	#define CONFIG_NOCLID 128
33820b7e	275
9e4abcb5	276	struct dhcp_opt {
1ab84e2f	277	int opt, len, is_addr;
9e4abcb5	278	unsigned char *val;
44a2a316	279	char *netid;
9e4abcb5	280	struct dhcp_opt *next;
a84fa1d0 SK	281	};
	282
	283	struct dhcp_vendor {
a222641c SK	284	int len, is_vendor, used;
	285	char *data;
	286	struct dhcp_netid netid;
a84fa1d0 SK	287	struct dhcp_vendor *next;
a84fa1d0 SK	288	};
9e4abcb5 SK	289
9e4abcb5 SK	290	struct dhcp_context {
feba5c1d	291	unsigned int lease_time, addr_epoch;
44a2a316	292	struct in_addr netmask, broadcast;
a84fa1d0	293	struct in_addr start, end; /* range of available addresses */
a222641c	294	struct dhcp_netid netid;
9e4abcb5 SK	295	struct dhcp_context *next;
	296	};
	297
	298	typedef unsigned char u8;
	299	typedef unsigned short u16;
	300	typedef unsigned int u32;
	301
	302
	303	struct udp_dhcp_packet {
	304	struct ip ip;
	305	struct udphdr {
	306	u16 uh_sport; /* source port */
	307	u16 uh_dport; /* destination port */
	308	u16 uh_ulen; /* udp length */
	309	u16 uh_sum; /* udp checksum */
	310	} udp;
	311	struct dhcp_packet {
	312	u8 op, htype, hlen, hops;
	313	u32 xid;
	314	u16 secs, flags;
	315	struct in_addr ciaddr, yiaddr, siaddr, giaddr;
	316	u8 chaddr[16], sname[64], file[128];
	317	u32 cookie;
	318	u8 options[308];
	319	} data;
	320	};
	321
	322
	323	/* cache.c */
	324	void cache_init(int cachesize, int log);
c1bb8504	325	void log_query(unsigned short flags, char name, struct all_addr addr, unsigned short type);
9e4abcb5 SK	326	struct crec cache_find_by_addr(struct crec crecp,
	327	struct all_addr *addr, time_t now,
	328	unsigned short prot);
	329	struct crec cache_find_by_name(struct crec crecp,
	330	char *name, time_t now, unsigned short prot);
	331	void cache_end_insert(void);
	332	void cache_start_insert(void);
	333	void cache_insert(char name, struct all_addr addr,
	334	time_t now, unsigned long ttl, unsigned short flags);
	335	void cache_reload(int opts, char buff, char domain_suffix, char *addn_hosts);
c1bb8504	336	void cache_add_dhcp_entry(char host_name, struct in_addr host_address, time_t ttd);
9e4abcb5 SK	337	void cache_unhash_dhcp(void);
	338	void dump_cache(int debug, int size);
	339	char cache_get_name(struct crec crecp);
	340
	341	/* rfc1035.c */
c1bb8504 SK	342	unsigned short extract_request(HEADER *header, unsigned int qlen,
c1bb8504 SK	343	char name, unsigned short typep);
9e4abcb5 SK	344	int setup_reply(HEADER *header, unsigned int qlen,
	345	struct all_addr *addrp, unsigned short flags,
	346	unsigned long local_ttl);
1cff166d SK	347	void extract_addresses(HEADER header, unsigned int qlen, char namebuff,
1cff166d SK	348	time_t now, struct doctor *doctors);
9e4abcb5	349	void extract_neg_addrs(HEADER header, unsigned int qlen, char namebuff, time_t now);
de37951c	350	int answer_request(HEADER header, char limit, unsigned int qlen, struct mx_record *mxnames,
9e4abcb5	351	char *mxtarget, unsigned int options, time_t now, unsigned long local_ttl,
feba5c1d	352	char *namebuff, unsigned short edns_pcktsz);
9e4abcb5 SK	353	int check_for_bogus_wildcard(HEADER header, unsigned int qlen, char name,
9e4abcb5 SK	354	struct bogus_addr *addr, time_t now);
feba5c1d	355	unsigned char find_pseudoheader(HEADER header, unsigned int plen);
9e4abcb5 SK	356
	357	/* util.c */
	358	unsigned short rand16(void);
	359	int legal_char(char c);
	360	int canonicalise(char *s);
a222641c	361	int atoi_check(char a, int res);
9e4abcb5 SK	362	void die(char message, char arg1);
	363	void complain(char message, char arg1);
	364	void *safe_malloc(int size);
	365	char safe_string_alloc(char cp);
	366	int sa_len(union mysockaddr *addr);
	367	int sockaddr_isequal(union mysockaddr s1, union mysockaddr s2);
	368	int hostname_isequal(unsigned char a, unsigned char b);
44a2a316	369	time_t dnsmasq_time(int fd);
a84fa1d0 SK	370	int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
a84fa1d0 SK	371
9e4abcb5 SK	372	/* option.c */
9e4abcb5 SK	373	unsigned int read_opts(int argc, char *argv, char buff, struct resolvc **resolv_file,
de37951c	374	struct mx_record mxnames, char mxtarget, char **lease_file,
9e4abcb5 SK	375	char username, char groupname,
	376	char domain_suffix, char runfile,
	377	struct iname if_names, struct iname if_addrs, struct iname **if_except,
	378	struct bogus_addr bogus_addr, struct server serv_addrs, int *cachesize,
	379	int port, int query_port, unsigned long local_ttl, char *addn_hosts,
a84fa1d0 SK	380	struct dhcp_context dhcp, struct dhcp_config dhcp_conf,
a84fa1d0 SK	381	struct dhcp_opt opts, struct dhcp_vendor dhcp_vendors,
44a2a316	382	char dhcp_file, char dhcp_sname, struct in_addr *dhcp_next_server,
feba5c1d SK	383	int maxleases, unsigned int min_leasetime, struct doctor **doctors,
feba5c1d SK	384	unsigned short *edns_pktsz);
9e4abcb5 SK	385
	386	/* forward.c */
	387	void forward_init(int first);
de37951c SK	388	struct server reply_query(struct serverfd sfd, int options, char *packet, time_t now,
de37951c SK	389	char dnamebuff, struct server servers, struct server *last_server,
feba5c1d SK	390	struct bogus_addr *bogus_nxdomain,
feba5c1d SK	391	struct doctor *doctors, unsigned short edns_pcktsz);
9e4abcb5	392
de37951c	393	struct server receive_query(struct listener listen, char packet, struct mx_record mxnames,
44a2a316 SK	394	char *mxtarget, unsigned int options, time_t now,
	395	unsigned long local_ttl, char *namebuff,
	396	struct iname names, struct iname addrs, struct iname *except,
feba5c1d SK	397	struct server last_server, struct server servers, unsigned short edns_pcktsz);
	398
	399	char tcp_request(int confd, struct mx_record mxnames,
	400	char *mxtarget, unsigned int options, time_t now,
	401	unsigned long local_ttl, char *namebuff,
	402	struct server last_server, struct server servers,
	403	struct bogus_addr bogus_nxdomain, struct doctor doctors,
	404	unsigned short edns_pcktsz);
9e4abcb5	405	/* network.c */
feba5c1d	406	struct serverfd allocate_sfd(union mysockaddr addr, struct serverfd **sfds);
9e4abcb5 SK	407	struct server reload_servers(char fname, char buff, struct server servers, int query_port);
9e4abcb5 SK	408	struct server check_servers(struct server new, struct irec interfaces, struct serverfd *sfds);
a84fa1d0 SK	409	struct irec enumerate_interfaces(struct iname *names,
a84fa1d0 SK	410	struct iname **addrs,
44a2a316 SK	411	struct iname *except,
	412	int port);
	413	struct listener *create_wildcard_listeners(int port);
feba5c1d	414	struct listener create_bound_listeners(struct irec interfaces, int port);
9e4abcb5	415	/* dhcp.c */
dfa666f2	416	void dhcp_init(int fdp, int rfdp, struct dhcp_config *configs);
44a2a316 SK	417	void dhcp_packet(struct dhcp_context contexts, char packet,
44a2a316 SK	418	struct dhcp_opt dhcp_opts, struct dhcp_config dhcp_configs,
a84fa1d0	419	struct dhcp_vendor *vendors,
9e4abcb5	420	time_t now, char namebuff, char domain_suffix,
44a2a316 SK	421	char dhcp_file, char dhcp_sname,
	422	struct in_addr dhcp_next_server, int dhcp_fd, int raw_fd,
	423	struct iname names, struct iname addrs, struct iname *except);
9e4abcb5 SK	424	int address_available(struct dhcp_context *context, struct in_addr addr);
9e4abcb5 SK	425	int address_allocate(struct dhcp_context context, struct dhcp_config configs,
a84fa1d0	426	struct in_addr addrp, unsigned char hwaddr);
9e4abcb5 SK	427	struct dhcp_config find_config(struct dhcp_config configs,
	428	struct dhcp_context *context,
	429	unsigned char *clid, int clid_len,
	430	unsigned char hwaddr, char hostname);
44a2a316 SK	431	struct dhcp_config read_ethers(struct dhcp_config configs, char *buff);
	432	void dhcp_update_configs(struct dhcp_config *configs);
	433	struct dhcp_config dhcp_read_ethers(struct dhcp_config configs, char *buff);
dfa666f2	434	struct dhcp_config config_find_by_address(struct dhcp_config configs, struct in_addr addr);
9e4abcb5	435	/* lease.c */
44a2a316 SK	436	void lease_update_file(int force, time_t now);
44a2a316 SK	437	void lease_update_dns(void);
9e4abcb5	438	int lease_init(char lease_file, char domain, char *buff,
44a2a316	439	char *buff2, time_t now, int maxleases);
9e4abcb5 SK	440	struct dhcp_lease lease_allocate(unsigned char clid, int clid_len, struct in_addr addr);
	441	void lease_set_hwaddr(struct dhcp_lease lease, unsigned char hwaddr);
	442	void lease_set_hostname(struct dhcp_lease lease, char name, char *suffix);
	443	void lease_set_expires(struct dhcp_lease *lease, time_t exp);
	444	struct dhcp_lease lease_find_by_client(unsigned char clid, int clid_len);
	445	struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
	446	void lease_prune(struct dhcp_lease *target, time_t now);
44a2a316	447	void lease_update_from_configs(struct dhcp_config dhcp_configs, char domain);
a84fa1d0	448
9e4abcb5	449	/* rfc2131.c */
44a2a316 SK	450	int dhcp_reply(struct dhcp_context *context,
	451	struct in_addr iface_addr,
	452	char *iface_name,
	453	int iface_mtu,
	454	struct udp_dhcp_packet *rawpacket,
9e4abcb5	455	unsigned int sz, time_t now, char *namebuff,
44a2a316	456	struct dhcp_opt dhcp_opts, struct dhcp_config dhcp_configs,
a84fa1d0	457	struct dhcp_vendor *vendors,
9e4abcb5	458	char domain_suffix, char dhcp_file, char *dhcp_sname,
8a911ccc	459	struct in_addr dhcp_next_server, struct in_addr router);
44a2a316	460
33820b7e SK	461	/* isc.c */
	462	#ifdef HAVE_ISC_READER
	463	void load_dhcp(char file, char suffix, time_t now, char *hostname);
	464	#endif
feba5c1d	465