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Editing: tcpd.h

/*
  * @(#) tcpd.h 1.5 96/03/19 16:22:24
  * 
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  *
  * $FreeBSD$
  */

#ifdef INET6
#define	TCPD_SOCKADDR struct sockaddr
#else
#define	TCPD_SOCKADDR struct sockaddr_in
#endif

#ifndef _STDFILE_DECLARED
#define _STDFILE_DECLARED
typedef struct __sFILE FILE;
#endif

/* Structure to describe one communications endpoint. */

#define	STRING_LENGTH	128		/* hosts, users, processes */

struct host_info {
    char    name[STRING_LENGTH];	/* access via eval_hostname(host) */
    char    addr[STRING_LENGTH];	/* access via eval_hostaddr(host) */
    TCPD_SOCKADDR *sin;			/* socket address or 0 */
    struct t_unitdata *unit;		/* TLI transport address or 0 */
    struct request_info *request;	/* for shared information */
};

/* Structure to describe what we know about a service request. */

struct request_info {
    int     fd;				/* socket handle */
    char    user[STRING_LENGTH];	/* access via eval_user(request) */
    char    daemon[STRING_LENGTH];	/* access via eval_daemon(request) */
    char    pid[10];			/* access via eval_pid(request) */
    struct host_info client[1];		/* client endpoint info */
    struct host_info server[1];		/* server endpoint info */
    void  (*sink) (int);		/* datagram sink function or 0 */
    void  (*hostname) (struct host_info *); /* address to printable hostname */
    void  (*hostaddr) (struct host_info *); /* address to printable address */
    void  (*cleanup) (struct request_info *); /* cleanup function or 0 */
    struct netconfig *config;		/* netdir handle */
};

/* Common string operations. Less clutter should be more readable. */

#define	STRN_CPY(d,s,l)	{ strncpy((d),(s),(l)); (d)[(l)-1] = 0; }

#define	STRN_EQ(x,y,l)	(strncasecmp((x),(y),(l)) == 0)
#define	STRN_NE(x,y,l)	(strncasecmp((x),(y),(l)) != 0)
#define	STR_EQ(x,y)	(strcasecmp((x),(y)) == 0)
#define	STR_NE(x,y)	(strcasecmp((x),(y)) != 0)

/*
  * Initially, all above strings have the empty value. Information that
  * cannot be determined at runtime is set to "unknown", so that we can
  * distinguish between `unavailable' and `not yet looked up'. A hostname
  * that we do not believe in is set to "paranoid".
  */

#define	STRING_UNKNOWN	"unknown"	/* lookup failed */
#define	STRING_PARANOID	"paranoid"	/* hostname conflict */

extern char unknown[];
extern char paranoid[];

#define	HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))

#define	NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0)

/* Global functions. */

#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
void fromhost(struct request_info *);	/* get/validate client host info */
#else
#define	fromhost sock_host		/* no TLI support needed */
#endif

int hosts_access(struct request_info *);			/* access control */
int hosts_ctl(char *, char *, char *, char *);			/* wrapper around request_init() */
void shell_cmd(char *);						/* execute shell command */
char *percent_x(char *, int, char *, struct request_info *);	/* do %<char> expansion */
void rfc931(TCPD_SOCKADDR *, TCPD_SOCKADDR *, char *);		/* client name from RFC 931 daemon */
void clean_exit(struct request_info *);				/* clean up and exit */
void refuse(struct request_info *);				/* clean up and exit */
char *xgets(char *, int, FILE *);				/* fgets() on steroids */

char *split_at(char *, int);					/* strchr() and split */
unsigned long dot_quad_addr(char *);				/* restricted inet_addr() */

/* Global variables. */

extern int allow_severity;		/* for connection logging */
extern int deny_severity;		/* for connection logging */
extern char *hosts_allow_table;		/* for verification mode redirection */
extern char *hosts_deny_table;		/* for verification mode redirection */
extern int hosts_access_verbose;	/* for verbose matching mode */
extern int rfc931_timeout;		/* user lookup timeout */
extern int resident;			/* > 0 if resident process */

/*
  * Routines for controlled initialization and update of request structure
  * attributes. Each attribute has its own key.
  */

struct request_info *request_init(struct request_info *,...);	/* initialize request */
struct request_info *request_set(struct request_info *,...);	/* update request structure */

#define	RQ_FILE		1		/* file descriptor */
#define	RQ_DAEMON	2		/* server process (argv[0]) */
#define	RQ_USER		3		/* client user name */
#define	RQ_CLIENT_NAME	4		/* client host name */
#define	RQ_CLIENT_ADDR	5		/* client host address */
#define	RQ_CLIENT_SIN	6		/* client endpoint (internal) */
#define	RQ_SERVER_NAME	7		/* server host name */
#define	RQ_SERVER_ADDR	8		/* server host address */
#define	RQ_SERVER_SIN	9		/* server endpoint (internal) */

/*
  * Routines for delayed evaluation of request attributes. Each attribute
  * type has its own access method. The trivial ones are implemented by
  * macros. The other ones are wrappers around the transport-specific host
  * name, address, and client user lookup methods. The request_info and
  * host_info structures serve as caches for the lookup results.
  */

char *eval_user(struct request_info *);		/* client user */
char *eval_hostname(struct host_info *);	/* printable hostname */
char *eval_hostaddr(struct host_info *);	/* printable host address */
char *eval_hostinfo(struct host_info *);	/* host name or address */
char *eval_client(struct request_info *);	/* whatever is available */
char *eval_server(struct request_info *);	/* whatever is available */
#define	eval_daemon(r)	((r)->daemon)	/* daemon process name */
#define	eval_pid(r)	((r)->pid)	/* process id */

/* Socket-specific methods, including DNS hostname lookups. */

void sock_host(struct request_info *);		/* look up endpoint addresses */
void sock_hostname(struct host_info *);		/* translate address to hostname */
void sock_hostaddr(struct host_info *);		/* address to printable address */
#define	sock_methods(r) \
	{ (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }

/* The System V Transport-Level Interface (TLI) interface. */

#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
void tli_host(struct request_info *);		/* look up endpoint addresses etc. */
#endif

/*
  * Problem reporting interface. Additional file/line context is reported
  * when available. The jump buffer (tcpd_buf) is not declared here, or
  * everyone would have to include <setjmp.h>.
  */

void tcpd_warn(char *, ...);		/* report problem and proceed */
void tcpd_jump(char *, ...);		/* report problem and jump */

struct tcpd_context {
    char   *file;			/* current file */
    int     line;			/* current line */
};
extern struct tcpd_context tcpd_context;

/*
  * While processing access control rules, error conditions are handled by
  * jumping back into the hosts_access() routine. This is cleaner than
  * checking the return value of each and every silly little function. The
  * (-1) returns are here because zero is already taken by longjmp().
  */

#define	AC_PERMIT	1		/* permit access */
#define	AC_DENY		(-1)		/* deny_access */
#define	AC_ERROR	AC_DENY		/* XXX */

/*
  * In verification mode an option function should just say what it would do,
  * instead of really doing it. An option function that would not return
  * should clear the dry_run flag to inform the caller of this unusual
  * behavior.
  */

void process_options(char *, struct request_info *);	/* execute options */
extern int dry_run;					/* verification flag */

/* Bug workarounds. */

#ifdef INET_ADDR_BUG			/* inet_addr() returns struct */
#define	inet_addr fix_inet_addr
long fix_inet_addr(char *);
#endif

#ifdef BROKEN_FGETS			/* partial reads from sockets */
#define	fgets fix_fgets
char *fix_fgets(char *, int, FILE *);
#endif

#ifdef RECVFROM_BUG			/* no address family info */
#define	recvfrom fix_recvfrom
int fix_recvfrom(int, char *, int, int, struct sockaddr *, int *);
#endif

#ifdef GETPEERNAME_BUG			/* claims success with UDP */
#define	getpeername fix_getpeername
int fix_getpeername(int, struct sockaddr *, int *);
#endif

#ifdef SOLARIS_24_GETHOSTBYNAME_BUG	/* lists addresses as aliases */
#define	gethostbyname fix_gethostbyname
struct hostent *fix_gethostbyname(char *);
#endif

#ifdef USE_STRSEP			/* libc calls strtok() */
#define	strtok	fix_strtok
char *fix_strtok(char *, char *);
#endif

#ifdef LIBC_CALLS_STRTOK		/* libc calls strtok() */
#define	strtok	my_strtok
char *my_strtok(char *, char *);
#endif

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Editing: tcpd.h

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