[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 <arpa/nameser.h>

#include "config.h"
 
#include <arpa/inet.h>
#include <sys/stat.h>
#include <sys/socket.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>
#include <netinet/ip_icmp.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
#define OPT_NO_FORK        65536

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, router;
  struct in_addr start, end; /* range of available addresses */
  int static_only;
  struct dhcp_netid netid;
  struct dhcp_context *next, *current;
};

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];
	  u8 options[312];
	} data;
};


struct daemon {
  /* datastuctures representing the command-line and 
     config file arguments. All set (including defaults)
     in option.c */

  unsigned int options;
  struct resolvc default_resolv, *resolv_files;
  struct mx_record *mxnames;
  char *mxtarget;
  char *lease_file; 
  char *username, *groupname;
  char *domain_suffix;
  char *runfile; 
  struct iname *if_names, *if_addrs, *if_except;
  struct bogus_addr *bogus_addr;
  struct server *servers;
  int cachesize;
  int port, query_port;
  unsigned long local_ttl;
  char *addn_hosts;
  struct dhcp_context *dhcp;
  struct dhcp_config *dhcp_conf;
  struct dhcp_opt *dhcp_opts;
  struct dhcp_vendor *dhcp_vendors;
  char *dhcp_file;
  char *dhcp_sname;
  struct in_addr dhcp_next_server;
  int dhcp_max; 
  unsigned int min_leasetime;
  struct doctor *doctors;
  unsigned short edns_pktsz;

  /* globally used stuff for DNS */
  char *packet; /* packet buffer */
  char *namebuff; /* MAXDNAME size buffer */
  struct serverfd *sfds;
  struct listener *listeners;
  struct server *last_server;
  int uptime_fd;
  
  /* DHCP state */
  int dhcpfd, dhcp_raw_fd, dhcp_icmp_fd, lease_fd;
  struct udp_dhcp_packet *dhcp_packet;
  char *dhcp_buff, *dhcp_buff2;
};

/* 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, unsigned short flags);
int answer_request(HEADER *header, char *limit, unsigned int qlen, struct daemon *daemon, time_t now);
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,
				 unsigned int *len, unsigned char **p);
int check_for_local_domain(char *name, time_t now, struct mx_record *mx);
int resize_packet(HEADER *header, unsigned int plen, 
		  unsigned char *pheader, unsigned int hlen);

/* 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 */
struct daemon *read_opts (int argc, char **argv);

/* forward.c */
void forward_init(int first);
void reply_query(struct serverfd *sfd, struct daemon *daemon, time_t now);
void receive_query(struct listener *listen, struct daemon *daemon, time_t now);
char *tcp_request(struct daemon *daemon, int confd, time_t now);

/* network.c */
struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds);
void reload_servers(char *fname, struct daemon *daemon);
void check_servers(struct daemon *daemon, struct irec *interfaces);
struct irec *enumerate_interfaces(struct daemon *daemon);
struct listener *create_wildcard_listeners(int port);
struct listener *create_bound_listeners(struct irec *interfaces, int port);

/* dhcp.c */
void dhcp_init(struct daemon *daemon);
void dhcp_packet(struct daemon *daemon, time_t now);

int address_available(struct dhcp_context *context, struct in_addr addr);
int address_allocate(struct dhcp_context *context, struct daemon *daemon,
		     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);
void dhcp_update_configs(struct dhcp_config *configs);
void dhcp_read_ethers(struct daemon *daemon);
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);
void lease_init(struct daemon *daemon, time_t now);
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 daemon *daemon, struct in_addr iface_addr, char *iface_name, unsigned int sz, time_t now);

/* dnsmasq.c */
int icmp_ping(struct daemon *daemon, struct in_addr addr);

/* 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>
3be34541	30	#include <arpa/nameser.h>
9e4abcb5 SK	31
9e4abcb5 SK	32	#include "config.h"
44a2a316	33
9e4abcb5 SK	34	#include <arpa/inet.h>
	35	#include <sys/stat.h>
	36	#include <sys/socket.h>
9e4abcb5 SK	37	#include <sys/ioctl.h>
9e4abcb5 SK	38	#include <sys/select.h>
feba5c1d	39	#include <sys/wait.h>
9e4abcb5	40	#if defined(__sun) \|\| defined(__sun__)
44a2a316	41	# include <sys/sockio.h>
9e4abcb5 SK	42	#endif
9e4abcb5 SK	43	#include <sys/time.h>
8a911ccc	44	#include <limits.h>
9e4abcb5 SK	45	#include <net/if.h>
	46	#include <unistd.h>
	47	#include <stdio.h>
	48	#include <string.h>
	49	#include <stdlib.h>
	50	#include <fcntl.h>
	51	#include <ctype.h>
	52	#include <signal.h>
	53	#ifdef HAVE_GETOPT_LONG
	54	# include <getopt.h>
	55	#endif
	56	#include <time.h>
	57	#include <errno.h>
	58	#include <pwd.h>
	59	#include <grp.h>
de37951c	60	#if defined(__OpenBSD__) \|\| defined(__NetBSD__)
44a2a316 SK	61	# include <netinet/if_ether.h>
	62	#else
	63	# include <net/ethernet.h>
	64	#endif
9e4abcb5 SK	65	#include <net/if_arp.h>
	66	#include <netinet/in_systm.h>
	67	#include <netinet/ip.h>
3be34541	68	#include <netinet/ip_icmp.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
3be34541	97	#define OPT_NO_FORK 65536
9e4abcb5 SK	98
	99	struct all_addr {
	100	union {
	101	struct in_addr addr4;
	102	#ifdef HAVE_IPV6
	103	struct in6_addr addr6;
	104	#endif
	105	} addr;
	106	};
	107
	108	struct bogus_addr {
	109	struct in_addr addr;
	110	struct bogus_addr *next;
	111	};
	112
1cff166d SK	113	/* dns doctor param */
	114	struct doctor {
	115	struct in_addr in, out, mask;
	116	struct doctor *next;
	117	};
	118
de37951c SK	119	struct mx_record {
	120	char mxname, mxtarget;
	121	struct mx_record *next;
	122	};
	123
9e4abcb5 SK	124	union bigname {
	125	char name[MAXDNAME];
	126	union bigname next; / freelist */
	127	};
	128
	129	struct crec {
	130	struct crec next, prev, *hash_next;
	131	time_t ttd; /* time to die */
	132	struct all_addr addr;
	133	unsigned short flags;
	134	union {
	135	char sname[SMALLDNAME];
	136	union bigname *bname;
	137	char *namep;
	138	} name;
	139	};
	140
	141	#define F_IMMORTAL 1
a84fa1d0	142	#define F_CONFIG 2
9e4abcb5 SK	143	#define F_REVERSE 4
	144	#define F_FORWARD 8
	145	#define F_DHCP 16
	146	#define F_NEG 32
	147	#define F_HOSTS 64
	148	#define F_IPV4 128
	149	#define F_IPV6 256
	150	#define F_BIGNAME 512
	151	#define F_UPSTREAM 1024
	152	#define F_SERVER 2048
	153	#define F_NXDOMAIN 4096
	154	#define F_QUERY 8192
	155	#define F_ADDN 16384
	156	#define F_NOERR 32768
	157
	158	/* struct sockaddr is not large enough to hold any address,
	159	and specifically not big enough to hold and IPv6 address.
	160	Blech. Roll our own. */
	161	union mysockaddr {
	162	struct sockaddr sa;
	163	struct sockaddr_in in;
	164	#ifdef HAVE_BROKEN_SOCKADDR_IN6
	165	/* early versions of glibc don't include sin6_scope_id in sockaddr_in6
	166	but latest kernels _require_ it to be set. The choice is to have
	167	dnsmasq fail to compile on back-level libc or fail to run
	168	on latest kernels with IPv6. Or to do this: sorry that it's so gross. */
	169	struct my_sockaddr_in6 {
	170	sa_family_t sin6_family; /* AF_INET6 */
	171	uint16_t sin6_port; /* transport layer port # */
	172	uint32_t sin6_flowinfo; /* IPv6 traffic class & flow info */
	173	struct in6_addr sin6_addr; /* IPv6 address */
	174	uint32_t sin6_scope_id; /* set of interfaces for a scope */
	175	} in6;
	176	#elif defined(HAVE_IPV6)
	177	struct sockaddr_in6 in6;
	178	#endif
	179	};
	180
	181	#define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */
	182	#define SERV_NO_ADDR 2 /* no server, this domain is local only */
	183	#define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */
	184	#define SERV_HAS_SOURCE 8 /* source address specified */
	185	#define SERV_HAS_DOMAIN 16 /* server for one domain only */
	186	#define SERV_FOR_NODOTS 32 /* server for names with no domain part only */
	187	#define SERV_TYPE (SERV_HAS_DOMAIN \| SERV_FOR_NODOTS)
	188
	189	struct serverfd {
	190	int fd;
	191	union mysockaddr source_addr;
	192	struct serverfd *next;
	193	};
	194
	195	struct server {
	196	union mysockaddr addr, source_addr;
	197	struct serverfd sfd; / non-NULL if this server has its own fd bound to
	198	a source port */
	199	char domain; / set if this server only handles a domain. */
feba5c1d	200	int flags, tcpfd;
9e4abcb5 SK	201	struct server *next;
	202	};
	203
9e4abcb5 SK	204	struct irec {
9e4abcb5 SK	205	union mysockaddr addr;
9e4abcb5 SK	206	struct irec *next;
	207	};
	208
44a2a316	209	struct listener {
feba5c1d	210	int fd, tcpfd, family;
44a2a316 SK	211	struct listener *next;
	212	};
	213
9e4abcb5 SK	214	/* interface and address parms from command line. */
	215	struct iname {
	216	char *name;
	217	union mysockaddr addr;
de37951c	218	int isloop, used;
9e4abcb5 SK	219	struct iname *next;
	220	};
	221
	222	/* resolv-file parms from command-line */
	223	struct resolvc {
	224	struct resolvc *next;
	225	int is_default;
	226	int logged;
	227	char *name;
	228	};
	229
	230	struct frec {
	231	union mysockaddr source;
44a2a316	232	struct all_addr dest;
9e4abcb5	233	struct server *sentto;
dfa666f2	234	unsigned int iface;
9e4abcb5 SK	235	unsigned short orig_id, new_id;
	236	int fd;
	237	time_t time;
	238	struct frec *next;
	239	};
	240
	241	struct dhcp_lease {
	242	int clid_len; /* length of client identifier */
	243	unsigned char clid; / clientid */
	244	char hostname, fqdn; /* name from client-hostname option or config */
	245	time_t expires; /* lease expiry */
	246	unsigned char hwaddr[ETHER_ADDR_LEN];
	247	struct in_addr addr;
	248	struct dhcp_lease *next;
	249	};
	250
a222641c SK	251	struct dhcp_netid {
	252	char *net;
	253	struct dhcp_netid *next;
	254	};
	255
9e4abcb5	256	struct dhcp_config {
33820b7e	257	unsigned int flags;
9e4abcb5 SK	258	int clid_len; /* length of client identifier */
	259	unsigned char clid; / clientid */
	260	unsigned char hwaddr[ETHER_ADDR_LEN];
a222641c SK	261	char *hostname;
a222641c SK	262	struct dhcp_netid netid;
9e4abcb5 SK	263	struct in_addr addr;
	264	unsigned int lease_time;
	265	struct dhcp_config *next;
	266	};
	267
33820b7e SK	268	#define CONFIG_DISABLE 1
	269	#define CONFIG_CLID 2
	270	#define CONFIG_HWADDR 4
	271	#define CONFIG_TIME 8
	272	#define CONFIG_NAME 16
	273	#define CONFIG_ADDR 32
	274	#define CONFIG_NETID 64
a84fa1d0	275	#define CONFIG_NOCLID 128
33820b7e	276
9e4abcb5	277	struct dhcp_opt {
1ab84e2f	278	int opt, len, is_addr;
9e4abcb5	279	unsigned char *val;
44a2a316	280	char *netid;
9e4abcb5	281	struct dhcp_opt *next;
a84fa1d0 SK	282	};
	283
	284	struct dhcp_vendor {
a222641c SK	285	int len, is_vendor, used;
	286	char *data;
	287	struct dhcp_netid netid;
a84fa1d0 SK	288	struct dhcp_vendor *next;
a84fa1d0 SK	289	};
9e4abcb5 SK	290
9e4abcb5 SK	291	struct dhcp_context {
feba5c1d	292	unsigned int lease_time, addr_epoch;
3be34541	293	struct in_addr netmask, broadcast, router;
a84fa1d0	294	struct in_addr start, end; /* range of available addresses */
3be34541	295	int static_only;
a222641c	296	struct dhcp_netid netid;
36717eee	297	struct dhcp_context next, current;
9e4abcb5 SK	298	};
	299
	300	typedef unsigned char u8;
	301	typedef unsigned short u16;
	302	typedef unsigned int u32;
	303
	304
	305	struct udp_dhcp_packet {
	306	struct ip ip;
	307	struct udphdr {
	308	u16 uh_sport; /* source port */
	309	u16 uh_dport; /* destination port */
	310	u16 uh_ulen; /* udp length */
	311	u16 uh_sum; /* udp checksum */
	312	} udp;
	313	struct dhcp_packet {
	314	u8 op, htype, hlen, hops;
	315	u32 xid;
	316	u16 secs, flags;
	317	struct in_addr ciaddr, yiaddr, siaddr, giaddr;
	318	u8 chaddr[16], sname[64], file[128];
3be34541	319	u8 options[312];
9e4abcb5 SK	320	} data;
	321	};
	322
	323
3be34541 SK	324	struct daemon {
	325	/* datastuctures representing the command-line and
	326	config file arguments. All set (including defaults)
	327	in option.c */
	328
	329	unsigned int options;
	330	struct resolvc default_resolv, *resolv_files;
	331	struct mx_record *mxnames;
	332	char *mxtarget;
	333	char *lease_file;
	334	char username, groupname;
	335	char *domain_suffix;
	336	char *runfile;
	337	struct iname if_names, if_addrs, *if_except;
	338	struct bogus_addr *bogus_addr;
	339	struct server *servers;
	340	int cachesize;
	341	int port, query_port;
	342	unsigned long local_ttl;
	343	char *addn_hosts;
	344	struct dhcp_context *dhcp;
	345	struct dhcp_config *dhcp_conf;
	346	struct dhcp_opt *dhcp_opts;
	347	struct dhcp_vendor *dhcp_vendors;
	348	char *dhcp_file;
	349	char *dhcp_sname;
	350	struct in_addr dhcp_next_server;
	351	int dhcp_max;
	352	unsigned int min_leasetime;
	353	struct doctor *doctors;
	354	unsigned short edns_pktsz;
	355
	356	/* globally used stuff for DNS */
	357	char packet; / packet buffer */
	358	char namebuff; / MAXDNAME size buffer */
	359	struct serverfd *sfds;
	360	struct listener *listeners;
	361	struct server *last_server;
	362	int uptime_fd;
	363
	364	/* DHCP state */
	365	int dhcpfd, dhcp_raw_fd, dhcp_icmp_fd, lease_fd;
	366	struct udp_dhcp_packet *dhcp_packet;
	367	char dhcp_buff, dhcp_buff2;
	368	};
	369
9e4abcb5 SK	370	/* cache.c */
9e4abcb5 SK	371	void cache_init(int cachesize, int log);
c1bb8504	372	void log_query(unsigned short flags, char name, struct all_addr addr, unsigned short type);
9e4abcb5 SK	373	struct crec cache_find_by_addr(struct crec crecp,
	374	struct all_addr *addr, time_t now,
	375	unsigned short prot);
	376	struct crec cache_find_by_name(struct crec crecp,
	377	char *name, time_t now, unsigned short prot);
	378	void cache_end_insert(void);
	379	void cache_start_insert(void);
	380	void cache_insert(char name, struct all_addr addr,
	381	time_t now, unsigned long ttl, unsigned short flags);
	382	void cache_reload(int opts, char buff, char domain_suffix, char *addn_hosts);
c1bb8504	383	void cache_add_dhcp_entry(char host_name, struct in_addr host_address, time_t ttd);
9e4abcb5 SK	384	void cache_unhash_dhcp(void);
	385	void dump_cache(int debug, int size);
	386	char cache_get_name(struct crec crecp);
	387
	388	/* rfc1035.c */
c1bb8504 SK	389	unsigned short extract_request(HEADER *header, unsigned int qlen,
c1bb8504 SK	390	char name, unsigned short typep);
9e4abcb5 SK	391	int setup_reply(HEADER *header, unsigned int qlen,
	392	struct all_addr *addrp, unsigned short flags,
	393	unsigned long local_ttl);
1cff166d SK	394	void extract_addresses(HEADER header, unsigned int qlen, char namebuff,
1cff166d SK	395	time_t now, struct doctor *doctors);
36717eee	396	void extract_neg_addrs(HEADER header, unsigned int qlen, char namebuff, time_t now, unsigned short flags);
3be34541	397	int answer_request(HEADER header, char limit, unsigned int qlen, struct daemon *daemon, time_t now);
9e4abcb5 SK	398	int check_for_bogus_wildcard(HEADER header, unsigned int qlen, char name,
9e4abcb5 SK	399	struct bogus_addr *addr, time_t now);
36717eee SK	400	unsigned char find_pseudoheader(HEADER header, unsigned int plen,
	401	unsigned int len, unsigned char *p);
	402	int check_for_local_domain(char name, time_t now, struct mx_record mx);
	403	int resize_packet(HEADER *header, unsigned int plen,
	404	unsigned char *pheader, unsigned int hlen);
9e4abcb5 SK	405
	406	/* util.c */
	407	unsigned short rand16(void);
	408	int legal_char(char c);
	409	int canonicalise(char *s);
a222641c	410	int atoi_check(char a, int res);
9e4abcb5 SK	411	void die(char message, char arg1);
	412	void complain(char message, char arg1);
	413	void *safe_malloc(int size);
	414	char safe_string_alloc(char cp);
	415	int sa_len(union mysockaddr *addr);
	416	int sockaddr_isequal(union mysockaddr s1, union mysockaddr s2);
	417	int hostname_isequal(unsigned char a, unsigned char b);
44a2a316	418	time_t dnsmasq_time(int fd);
a84fa1d0 SK	419	int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
a84fa1d0 SK	420
9e4abcb5	421	/* option.c */
3be34541	422	struct daemon read_opts (int argc, char *argv);
9e4abcb5 SK	423
	424	/* forward.c */
	425	void forward_init(int first);
3be34541 SK	426	void reply_query(struct serverfd sfd, struct daemon daemon, time_t now);
	427	void receive_query(struct listener listen, struct daemon daemon, time_t now);
	428	char tcp_request(struct daemon daemon, int confd, time_t now);
	429
9e4abcb5	430	/* network.c */
feba5c1d	431	struct serverfd allocate_sfd(union mysockaddr addr, struct serverfd **sfds);
3be34541 SK	432	void reload_servers(char fname, struct daemon daemon);
	433	void check_servers(struct daemon daemon, struct irec interfaces);
	434	struct irec enumerate_interfaces(struct daemon daemon);
44a2a316	435	struct listener *create_wildcard_listeners(int port);
feba5c1d	436	struct listener create_bound_listeners(struct irec interfaces, int port);
3be34541	437
9e4abcb5	438	/* dhcp.c */
3be34541 SK	439	void dhcp_init(struct daemon *daemon);
	440	void dhcp_packet(struct daemon *daemon, time_t now);
	441
9e4abcb5	442	int address_available(struct dhcp_context *context, struct in_addr addr);
3be34541	443	int address_allocate(struct dhcp_context context, struct daemon daemon,
a84fa1d0	444	struct in_addr addrp, unsigned char hwaddr);
9e4abcb5 SK	445	struct dhcp_config find_config(struct dhcp_config configs,
	446	struct dhcp_context *context,
	447	unsigned char *clid, int clid_len,
	448	unsigned char hwaddr, char hostname);
44a2a316	449	void dhcp_update_configs(struct dhcp_config *configs);
3be34541	450	void dhcp_read_ethers(struct daemon *daemon);
dfa666f2	451	struct dhcp_config config_find_by_address(struct dhcp_config configs, struct in_addr addr);
3be34541	452
9e4abcb5	453	/* lease.c */
44a2a316 SK	454	void lease_update_file(int force, time_t now);
44a2a316 SK	455	void lease_update_dns(void);
3be34541	456	void lease_init(struct daemon *daemon, time_t now);
9e4abcb5 SK	457	struct dhcp_lease lease_allocate(unsigned char clid, int clid_len, struct in_addr addr);
	458	void lease_set_hwaddr(struct dhcp_lease lease, unsigned char hwaddr);
	459	void lease_set_hostname(struct dhcp_lease lease, char name, char *suffix);
	460	void lease_set_expires(struct dhcp_lease *lease, time_t exp);
	461	struct dhcp_lease lease_find_by_client(unsigned char clid, int clid_len);
	462	struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
	463	void lease_prune(struct dhcp_lease *target, time_t now);
44a2a316	464	void lease_update_from_configs(struct dhcp_config dhcp_configs, char domain);
a84fa1d0	465
9e4abcb5	466	/* rfc2131.c */
3be34541 SK	467	int dhcp_reply(struct daemon daemon, struct in_addr iface_addr, char iface_name, unsigned int sz, time_t now);
	468
	469	/* dnsmasq.c */
	470	int icmp_ping(struct daemon *daemon, struct in_addr addr);
44a2a316	471
33820b7e SK	472	/* isc.c */
	473	#ifdef HAVE_ISC_READER
	474	void load_dhcp(char file, char suffix, time_t now, char *hostname);
	475	#endif
feba5c1d	476