嵌入式TCP/IP协议栈。 C 源码

				#ifndef	_FILES_H
				#define	_FILES_H
				
				/* Permission bits in FTPUSERS file */
				#define	FTP_READ	1	/* Read files */
				#define	FTP_CREATE	2	/* Create new files */
				#define	FTP_WRITE	4	/* Overwrite or delete existing files */
				#define AX25_CMD	8	/* AX.25 gateway operation allowed */
				#define TELNET_CMD	16	/* Telnet gateway operation allowed */
				#define NETROM_CMD	32	/* NET/ROM gateway operation allowed */
				#define SYSOP_CMD	64	/* Remote sysop access allowed */
				#define EXCLUDED_CMD	128	/* This user is banned from the BBS */
				#define PPP_ACCESS_PRIV	0x0100	/* Priv bit for PPP connection */
				#define PPP_PWD_LOOKUP	0x0200	/* Priv bit for peerID/pass lookup */
				
				
				/* External definitions for configuration-dependent file names set in
				 * files.c
				 */
				extern char *Startup;	/* Initialization file */
				extern char *Userfile;	/* Authorized FTP users and passwords */
				extern char *Maillog;	/* mail log */
				extern char *Mailspool;	/* Incoming mail */
				extern char *Mailqdir;	/* Outgoing mail spool */
				extern char *Mailqueue;	/* Outgoing mail work files */
				extern char *Routeqdir;	/* queue for router */
				extern char *Alias;	/* the alias file */
				extern char *Dfile;	/* Domain cache */
				extern char *Fdir;	/* Finger info directory */
				extern char *Arealist;		/* List of message areas */
				extern char *Helpdir;		/* Mailbox help file directory */
				extern char *Rewritefile;	/* Address rewrite file */
				extern char *Newsdir;		/* News messages and NNTP data */
				extern char *Popusers;		/* POP2 user and passwd file */
				extern char *Signature;		/* Mail signature file directory */
				extern char *Forwardfile;	/* Mail forwarding file */
				extern char *Historyfile;	/* Message ID history file */
				
				void initroot(char *root);
				char *rootdircat(char *filename);
				int userlogin(char *name,char *pass,char **path,int len,int *pwdignore);
				char *userlookup(char *username, char **password, char **directory,
							int *permission, int32 *ip_address);
				void usercvt(void);
				
				#endif	/* _FILES_H */