pppd.h

自己精简过的PPPD代码。在嵌入中应用可以更好的发挥。比原先的小了很多

/*
 * pppd.h - PPP daemon global declarations.
 *
 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any legal
 *    details, please contact
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      [phone], fax: [phone]
 *      [e-mail]
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * $Id: pppd.h,v 1.91 2005/08/25 23:59:34 paulus Exp $
 */

/*
 * TODO:
 */

#ifndef __PPPD_H__
#define __PPPD_H__

#include <stdio.h>		/* for FILE */
#include <limits.h>		/* for NGROUPS_MAX */
#include <sys/param.h>		/* for MAXPATHLEN and BSD4_4, if defined */
#include <sys/types.h>		/* for u_int32_t, if defined */
#include <sys/time.h>		/* for struct timeval */
#include <net/ppp_defs.h>
#include "patchlevel.h"

#if defined(__STDC__)
#include <stdarg.h>
#define __V(x)	x
#else
#include <varargs.h>
#define __V(x)	(va_alist) va_dcl
#define const
#define volatile
#endif

#ifdef INET6
#include "eui64.h"
#endif

/*
 * Limits.
 */

#define NUM_PPP		1	/* One PPP interface supported (per process) */
#define MAXWORDLEN	1024	/* max length of word in file (incl null) */
#define MAXARGS		1	/* max # args to a command */
#define MAXNAMELEN	256	/* max length of hostname or name for auth */
#define MAXSECRETLEN	256	/* max length of password or secret */

/*
 * Option descriptor structure.
 */

typedef unsigned char	bool;

enum opt_type {
	o_special_noarg = 0,
	o_special = 1,
	o_bool,
	o_int,
	o_uint32,
	o_string,
	o_wild
};

typedef struct {
	char	*name;		/* name of the option */
	enum opt_type type;
	void	*addr;
	char	*description;
	unsigned int flags;
	void	*addr2;
	int	upper_limit;
	int	lower_limit;
	const char *source;
	short int priority;
	short int winner;
} option_t;

/* Values for flags */
#define OPT_VALUE	0xff	/* mask for presupplied value */
#define OPT_HEX		0x100	/* int option is in hex */
#define OPT_NOARG	0x200	/* option doesn't take argument */
#define OPT_OR		0x400	/* OR in argument to value */
#define OPT_INC		0x800	/* increment value */
#define OPT_A2OR	0x800	/* for o_bool, OR arg to *(u_char *)addr2 */
#define OPT_PRIV	0x1000	/* privileged option */
#define OPT_STATIC	0x2000	/* string option goes into static array */
#define OPT_LLIMIT	0x4000	/* check value against lower limit */
#define OPT_ULIMIT	0x8000	/* check value against upper limit */
#define OPT_LIMITS	(OPT_LLIMIT|OPT_ULIMIT)
#define OPT_ZEROOK	0x10000	/* 0 value is OK even if not within limits */
#define OPT_HIDE	0x10000	/* for o_string, print value as ?????? */
#define OPT_A2LIST	0x10000 /* for o_special, keep list of values */
#define OPT_A2CLRB	0x10000 /* o_bool, clr val bits in *(u_char *)addr2 */
#define OPT_NOINCR	0x20000	/* value mustn't be increased */
#define OPT_ZEROINF	0x40000	/* with OPT_NOINCR, 0 == infinity */
#define OPT_PRIO	0x80000	/* process option priorities for this option */
#define OPT_PRIOSUB	0x100000 /* subsidiary member of priority group */
#define OPT_ALIAS	0x200000 /* option is alias for previous option */
#define OPT_A2COPY	0x400000 /* addr2 -> second location to rcv value */
#define OPT_ENABLE	0x800000 /* use *addr2 as enable for option */
#define OPT_A2CLR	0x1000000 /* clear *(bool *)addr2 */
#define OPT_PRIVFIX	0x2000000 /* user can't override if set by root */
#define OPT_INITONLY	0x4000000 /* option can only be set in init phase */
#define OPT_DEVEQUIV	0x8000000 /* equiv to device name */
#define OPT_DEVNAM	(OPT_INITONLY | OPT_DEVEQUIV)
#define OPT_A2PRINTER	0x10000000 /* *addr2 is a fn for printing option */
#define OPT_A2STRVAL	0x20000000 /* *addr2 points to current string value */
#define OPT_NOPRINT	0x40000000 /* don't print this option at all */

#define OPT_VAL(x)	((x) & OPT_VALUE)

/* Values for priority */
#define OPRIO_DEFAULT	0	/* a default value */
#define OPRIO_CFGFILE	1	/* value from a configuration file */
#define OPRIO_CMDLINE	2	/* value from the command line */
#define OPRIO_SECFILE	3	/* value from options in a secrets file */
#define OPRIO_ROOT	100	/* added to priority if OPT_PRIVFIX && root */

#ifndef GIDSET_TYPE
#define GIDSET_TYPE	gid_t
#endif

/* Structure representing a list of permitted IP addresses. */
struct permitted_ip {
    int		permit;		/* 1 = permit, 0 = forbid */
    u_int32_t	base;		/* match if (addr & mask) == base */
    u_int32_t	mask;		/* base and mask are in network byte order */
};

/*
 * Unfortunately, the linux kernel driver uses a different structure
 * for statistics from the rest of the ports.
 * This structure serves as a common representation for the bits
 * pppd needs.
 */
struct pppd_stats {
    unsigned int	bytes_in;
    unsigned int	bytes_out;
    unsigned int	pkts_in;
    unsigned int	pkts_out;
};

/* Used for storing a sequence of words.  Usually malloced. */
struct wordlist {
    struct wordlist	*next;
    char		*word;
};

/* An endpoint discriminator, used with multilink. */
#define MAX_ENDP_LEN	20	/* maximum length of discriminator value */
struct epdisc {
    unsigned char	class;
    unsigned char	length;
    unsigned char	value[MAX_ENDP_LEN];
};

/* values for epdisc.class */
#define EPD_NULL	0	/* null discriminator, no data */
#define EPD_LOCAL	1
#define EPD_IP		2
#define EPD_MAC		3
#define EPD_MAGIC	4
#define EPD_PHONENUM	5

typedef void (*notify_func) __P((void *, int));

struct notifier {
    struct notifier *next;
    notify_func	    func;
    void	    *arg;
};

/*
 * Global variables.
 */

extern int	hungup;		/* Physical layer has disconnected */
extern int	ifunit;		/* Interface unit number */
extern char	ifname[];	/* Interface name */
extern char	hostname[];	/* Our hostname */
extern u_char	outpacket_buf[]; /* Buffer for outgoing packets */
extern int	devfd;		/* fd of underlying device */
extern int	fd_ppp;		/* fd for talking PPP */
extern int	phase;		/* Current state of link - see values below */
extern int	baud_rate;	/* Current link speed in bits/sec */
extern char	*progname;	/* Name of this program */
extern int	redirect_stderr;/* Connector's stderr should go to file */
extern char	peer_authname[];/* Authenticated name of peer */
extern int	auth_done[NUM_PPP]; /* Methods actually used for auth */
extern int	privileged;	/* We were run by real-uid root */
extern int	need_holdoff;	/* Need holdoff period after link terminates */
extern char	**script_env;	/* Environment variables for scripts */
extern int	detached;	/* Have detached from controlling tty */
extern GIDSET_TYPE groups[NGROUPS_MAX];	/* groups the user is in */
extern int	ngroups;	/* How many groups valid in groups */
extern struct pppd_stats link_stats; /* byte/packet counts etc. for link */
extern int	link_stats_valid; /* set if link_stats is valid */
extern unsigned	link_connect_time; /* time the link was up for */
extern int	using_pty;	/* using pty as device (notty or pty opt.) */
extern int	log_to_fd;	/* logging to this fd as well as syslog */
extern bool	log_default;	/* log_to_fd is default (stdout) */
extern char	*no_ppp_msg;	/* message to print if ppp not in kernel */
extern volatile int status;	/* exit status for pppd */
extern bool	devnam_fixed;	/* can no longer change devnam */
extern int	unsuccess;	/* # unsuccessful connection attempts */
extern int	do_callback;	/* set if we want to do callback next */
extern int	doing_callback;	/* set if this is a callback */
extern int	error_count;	/* # of times error() has been called */
extern char	ppp_devnam[MAXPATHLEN];
extern char     remote_number[MAXNAMELEN]; /* Remote telephone number, if avail. */
extern int      ppp_session_number; /* Session number (eg PPPoE session) */
extern int	fd_devnull;	/* fd open to /dev/null */

extern int	listen_time;	/* time to listen first (ms) */
extern bool	doing_multilink;
extern bool	multilink_master;
extern bool	bundle_eof;
extern bool	bundle_terminating;

extern struct notifier *pidchange;   /* for notifications of pid changing */
extern struct notifier *phasechange; /* for notifications of phase changes */
extern struct notifier *exitnotify;  /* for notification that we're exiting */
extern struct notifier *sigreceived; /* notification of received signal */
extern struct notifier *ip_up_notifier; /* IPCP has come up */
extern struct notifier *ip_down_notifier; /* IPCP has gone down */
extern struct notifier *auth_up_notifier; /* peer has authenticated */
extern struct notifier *link_down_notifier; /* link has gone down */
extern struct notifier *fork_notifier;	/* we are a new child process */

/* Values for do_callback and doing_callback */
#define CALLBACK_DIALIN		1	/* we are expecting the call back */
#define CALLBACK_DIALOUT	2	/* we are dialling out to call back */

/*
 * Variables set by command-line options.
 */

extern int	debug;		/* Debug flag */
extern int	kdebugflag;	/* Tell kernel to print debug messages */
extern int	default_device;	/* Using /dev/tty or equivalent */
extern char	devnam[MAXPATHLEN];	/* Device name */
extern int	crtscts;	/* Use hardware flow control */
extern bool	modem;		/* Use modem control lines */
extern int	inspeed;	/* Input/Output speed requested */
extern u_int32_t netmask;	/* IP netmask to set on interface */
extern bool	lockflag;	/* Create lock file to lock the serial dev */
extern bool	nodetach;	/* Don't detach from controlling tty */
extern bool	updetach;	/* Detach from controlling tty when link up */
extern char	*initializer;	/* Script to initialize physical link */
extern char	*connect_script; /* Script to establish physical link */
extern char	*disconnect_script; /* Script to disestablish physical link */
extern char	*welcomer;	/* Script to welcome client after connection */
extern char	*ptycommand;	/* Command to run on other side of pty */
extern int	maxconnect;	/* Maximum connect time (seconds) */
extern char	user[MAXNAMELEN];/* Our name for authenticating ourselves */
extern char	passwd[MAXSECRETLEN];	/* Password for PAP or CHAP */
extern bool	auth_required;	/* Peer is required to authenticate */
extern bool	persist;	/* Reopen link after it goes down */
extern bool	uselogin;	/* Use /etc/passwd for checking PAP */
extern char	our_name[MAXNAMELEN];/* Our name for authentication purposes */
extern char	remote_name[MAXNAMELEN]; /* Peer's name for authentication */
extern bool	explicit_remote;/* remote_name specified with remotename opt */
extern bool	demand;		/* Do dial-on-demand */
extern char	*ipparam;	/* Extra parameter for ip up/down scripts */
extern bool	cryptpap;	/* Others' PAP passwords are encrypted */
extern int	idle_time_limit;/* Shut down link if idle for this long */
extern int	holdoff;	/* Dead time before restarting */