minix/commands/dhcpd/dhcpd.h

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2005-04-21 16:53:53 +02:00
/* dhcpd.h - Dynamic Host Configuration Protocol daemon.
* Author: Kees J. Bot
* 16 Dec 2000
*/
#define nil ((void*)0)
/* Paths to files. */
#define PATH_DHCPCONF "/etc/dhcp.conf"
#define PATH_DHCPPID "/usr/run/dhcpd.pid"
#define PATH_DHCPCACHE "/usr/adm/dhcp.cache"
#define PATH_DHCPPOOL "/usr/adm/dhcp.pool"
#define CLID_MAX 32 /* Maximum client ID length. */
#ifndef EXTERN
#define EXTERN extern
#endif
EXTERN char *program; /* This program's name. */
extern char *configfile; /* Configuration file. */
extern char *poolfile; /* Dynamic address pool. */
EXTERN int serving; /* True if being a DHCP server. */
EXTERN unsigned test; /* Test level. */
EXTERN unsigned debug; /* Debug level. */
EXTERN asynchio_t asyn; /* Bookkeeping for all async I/O. */
/* BOOTP UDP ports: (That they are different is quite stupid.) */
EXTERN u16_t port_server; /* Port server listens on. */
EXTERN u16_t port_client; /* Port client listens on. */
#define arraysize(a) (sizeof(a) / sizeof((a)[0]))
#define arraylimit(a) ((a) + arraysize(a))
#define between(a,c,z) (sizeof(c) <= sizeof(unsigned) ? \
(unsigned) (c) - (a) <= (unsigned) (z) - (a) : \
(unsigned long) (c) - (a) <= (unsigned long) (z) - (a))
/* To treat objects as octet arrays: */
#define B(a) ((u8_t *) (a))
/* Times. */
EXTERN time_t start, now; /* Start and current time. */
EXTERN time_t event; /* Time of the next timed event. */
/* Special times and periods: */
#define NEVER (sizeof(time_t) <= sizeof(int) ? INT_MAX : LONG_MAX)
#define DELTA_FIRST 4 /* Between first and second query. */
#define DELTA_FAST 64 /* Unbound queries this often. */
#define DELTA_SLOW 512 /* Bound queries are more relaxed. */
#define N_SOLICITS 3 /* Number of solicitations. */
#define DELTA_SOL 3 /* Time between solicitations. */
#define DELTA_ADV 2048 /* Router adverts to self lifetime. */
/* Buffers for packets. */
typedef struct buf {
eth_hdr_t *eth; /* Ethernet header in payload. */
ip_hdr_t *ip; /* IP header in payload. */
udp_hdr_t *udp; /* UDP header in payload. */
udp_io_hdr_t *udpio; /* UDP I/O header in payload. */
dhcp_t *dhcp; /* DHCP data in payload. */
u8_t pad[2]; /* buf[] must start at 2 mod 4. */
/* Payload: */
u8_t buf[ETH_MAX_PACK_SIZE];
} buf_t;
#define BUF_ETH_SIZE (ETH_MAX_PACK_SIZE)
#define BUF_IP_SIZE (BUF_ETH_SIZE - sizeof(eth_hdr_t))
#define BUF_UDP_SIZE (BUF_IP_SIZE - sizeof(ip_hdr_t) - sizeof(udp_hdr_t) \
+ sizeof(udp_io_hdr_t))
/* Type of network device open: Ethernet, ICMP, BOOTP client, BOOTP server. */
typedef enum { FT_CLOSED, FT_ETHERNET, FT_ICMP, FT_BOOTPC, FT_BOOTPS } fdtype_t;
#define FT_ALL FT_CLOSED /* To close all open descriptors at once. */
typedef struct fd { /* An open descriptor. */
i8_t fd; /* Open descriptor. */
u8_t fdtype; /* Type of network open. */
char device[sizeof("/dev/eth###")]; /* Device name. */
u8_t n; /* Network that owns it. */
buf_t *bp; /* Associated packet buffer. */
time_t since; /* Open since when? */
} fd_t;
/* Network state: Any IP device, Ethernet in sink mode, True Ethernet. */
typedef enum { NT_IP, NT_SINK, NT_ETHERNET } nettype_t;
typedef struct network { /* Information on a network. */
u8_t n; /* Network number. */
ether_addr_t eth; /* Ethernet address of this net. */
u8_t type; /* What kind of net is this? */
i8_t sol_ct; /* Router solicitation count. */
ether_addr_t conflict; /* Address conflict with this one. */
unsigned flags; /* Various flags. */
fd_t *fdp; /* Current open device. */
struct network *wait; /* Wait for a resource list. */
ipaddr_t ip; /* IP address of this net. */
ipaddr_t mask; /* Associated netmask. */
ipaddr_t gateway; /* My router. */
ipaddr_t server; /* My DHCP server. */
const char *hostname; /* Optional hostname to query for. */
time_t start; /* Query or lease start time. */
time_t delta; /* Query again after delta seconds. */
time_t renew; /* Next query or go into renewal. */
time_t rebind; /* When to go into rebind. */
time_t lease; /* When our lease expires. */
time_t solicit; /* Time to do a router solicitation. */
} network_t;
/* Flags. */
#define NF_NEGOTIATING 0x001 /* Negotiating with a DHCP server. */
#define NF_BOUND 0x002 /* Address configured through DHCP. */
#define NF_SERVING 0x004 /* I'm a server on this network. */
#define NF_RELAYING 0x008 /* I'm relaying for this network. */
#define NF_WAIT 0x010 /* Wait for a resource to free up. */
#define NF_IRDP 0x020 /* IRDP is used on this net. */
#define NF_CONFLICT 0x040 /* There is an address conflict. */
#define NF_POSSESSIVE 0x080 /* Keep address if lease expires. */
#define NF_INFORM 0x100 /* It's ok to answer DHCPINFORM. */
/* Functions defined in dhcpd.c. */
void report(const char *label);
void fatal(const char *label);
void *allocate(size_t size);
int ifname2if(const char *name);
network_t *if2net(int n);
/* Devices.c */
void get_buf(buf_t **bp);
void put_buf(buf_t **bp);
void give_buf(buf_t **dbp, buf_t **sbp);
network_t *newnetwork(void);
void closefd(fd_t *fdp);
int opendev(network_t *np, fdtype_t fdtype, int compete);
void closedev(network_t *np, fdtype_t fdtype);
char *ipdev(int n);
void set_ipconf(char *device, ipaddr_t ip, ipaddr_t mask, unsigned mtu);
/* Ether.c */
void udp2ether(buf_t *bp, network_t *np);
int ether2udp(buf_t *bp);
void make_arp(buf_t *bp, network_t *np);
int is_arp_me(buf_t *bp, network_t *np);
void icmp_solicit(buf_t *bp);
void icmp_advert(buf_t *bp, network_t *np);
ipaddr_t icmp_is_advert(buf_t *bp);
/* Tags.c */
#define gettag(dp, st, pd, pl) dhcp_gettag((dp), (st), (pd), (pl))
void settag(dhcp_t *dp, int tag, void *data, size_t len);
char *cidr_ntoa(ipaddr_t addr, ipaddr_t mask);
void ether2clid(u8_t *clid, ether_addr_t *eth);
void initdhcpconf(void);
int makedhcp(dhcp_t *dp, u8_t *class, size_t calen, u8_t *client, size_t cilen,
ipaddr_t ip, ipaddr_t ifip, network_t *np);
char *dhcptypename(int type);
void printdhcp(dhcp_t *dp);