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Code Editor : tcpd.h

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

#ifndef _TCPWRAPPERS_TCPD_H
#define _TCPWRAPPERS_TCPD_H

/* someone else may have defined this */
#undef  __P

/* use prototypes if we have an ANSI C compiler or are using C++ */
#if defined(__STDC__) || defined(__cplusplus)
#define __P(args)       args
#else
#define __P(args)       ()
#endif

/* Need definitions of struct sockaddr_in and FILE. */
#include <netinet/in.h>
#include <stdio.h>

__BEGIN_DECLS

/* Structure to describe one communications endpoint. */

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

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

typedef struct sockaddr_gen {
    union {
	struct sockaddr	_sg_sa;
	struct sockaddr_in	_sg_sin;
#ifdef HAVE_IPV6
	struct sockaddr_in6	_sg_sin6;
#endif
    } sg_addr;
} sockaddr_gen;

typedef union gen_addr {
    struct in_addr	ga_in;
#ifdef HAVE_IPV6
    struct in6_addr	ga_in6;
#endif
} gen_addr;

extern void sockgen_simplify();

#define sg_sa		sg_addr._sg_sa
#define sg_sin		sg_addr._sg_sin
#define sg_sin6		sg_addr._sg_sin6
#define sg_family	sg_sa.sa_family
#ifdef HAVE_IPV6
#define SGADDRSZ(sag)		((sag)->sg_family == AF_INET6 ? \
				    sizeof (struct in6_addr) : \
				    sizeof (struct in_addr))
#define SGSOCKADDRSZ(sag)	((sag)->sg_family == AF_INET6 ? \
				    sizeof (struct sockaddr_in6) : \
				    sizeof (struct sockaddr_in))
#define SGPORT(sag)		(*((sag)->sg_family == AF_INET6 ? \
				    &(sag)->sg_sin6.sin6_port : \
				    &(sag)->sg_sin.sin_port))
#define SGADDRP(sag)		(((sag)->sg_family == AF_INET6 ? \
				    (char *) &(sag)->sg_sin6.sin6_addr : \
				    (char *) &(sag)->sg_sin.sin_addr))
#define SGFAM(sag)		((sag)->sg_family == AF_INET6 ? \
				    AF_INET6 : AF_INET)

#define SG_IS_UNSPECIFIED(sag) \
		((sag)->sg_family == AF_INET6 ? \
			IN6_IS_ADDR_UNSPECIFIED(&(sag)->sg_sin6.sin6_addr) : \
			(sag)->sg_sin.sin_addr.s_addr == 0)

#define VALID_ADDRTYPE(t)	((t) == AF_INET || (t) == AF_INET6)

#ifndef IPV6_ABITS
#define IPV6_ABITS 128			/* Size of IPV6 address in bits */
#endif

#else /* HAVE_IPV6 */

#define SGADDRSZ(sag)		sizeof(struct in_addr)
#define SGSOCKADDRSZ(sag)	sizeof(struct sockaddr_in)
#define SGPORT(sag)		((sag)->sg_sin.sin_port)
#define SGADDRP(sag)		((char*) &(sag)->sg_sin.sin_addr)
#define SGFAM(sag)		AF_INET
#define SG_IS_UNSPECIFIED(sag)  ((sag)->sg_sin.sin_addr.s_addr == 0)

#define VALID_ADDRTYPE(t)	((t) == AF_INET)

#endif /* HAVE_IPV6 */

struct host_info {
    char    name[STRING_LENGTH];	/* access via eval_hostname(host) */
    char    addr[STRING_LENGTH];	/* access via eval_hostaddr(host) */
    struct sockaddr_gen *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) __P((int));		/* datagram sink function or 0 */
    void  (*hostname) __P((struct host_info *)); /* address to printable hostname */
    void  (*hostaddr) __P((struct host_info *)); /* address to printable address */
    void  (*cleanup) __P((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))

#ifdef HAVE_IPV6
#define NOT_INADDR(s) (strchr(s,':') == 0 && s[strspn(s,"0123456789./")] != 0)
#else
#define NOT_INADDR(s) (s[strspn(s,"0123456789./")] != 0)
#endif

/* Global functions. */

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

extern void shell_cmd __P((char *));		/* execute shell command */
extern char *percent_x __P((char *, int, char *, struct request_info *));		/* do %<char> expansion */
extern void rfc931 __P((struct sockaddr_gen *, struct sockaddr_gen *, char *));			/* client name from RFC 931 daemon */
extern void clean_exit __P((struct request_info *));		/* clean up and exit */
extern void refuse __P((struct request_info *));			/* clean up and exit */
extern char *xgets __P((char *, int, FILE *));			/* fgets() on steroids */
extern char *split_at __P((char *, int));		/* strchr() and split */
extern unsigned long dot_quad_addr __P((char *));	/* restricted inet_addr() */
extern unsigned long prefix_to_netmask __P((char *)); /* 0-32 prefix length */
extern int numeric_addr __P((char *, union gen_addr *, int *, int *));		/* IP4/IP6 inet_addr (restricted) */
extern struct hostent *tcpd_gethostbyname __P((char *, int));
					/* IP4/IP6 gethostbyname */
#ifdef HAVE_IPV6
extern char *skip_ipv6_addrs __P((char *));		/* skip over colons in IPv6 addrs */
#else
#define skip_ipv6_addrs(x)	x
#endif

/* Global variables. */

#ifdef HAVE_WEAKSYMS
extern int allow_severity __attribute__ ((weak)); /* for connection logging */
extern int deny_severity __attribute__ ((weak)); /* for connection logging */
#else
extern int allow_severity;		/* for connection logging */
extern int deny_severity;		/* for connection logging */
#endif

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.
  */

#ifdef __STDC__
extern int hosts_access(struct request_info *request);
extern int hosts_ctl(char *daemon, char *client_name, char *client_addr, 
                     char *client_user);
extern struct request_info *request_init(struct request_info *,...);
extern struct request_info *request_set(struct request_info *,...);
#else
extern int hosts_access();
extern int hosts_ctl();
extern struct request_info *request_init();	/* initialize request */
extern struct request_info *request_set();	/* update request structure */
#endif

#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.
  */

extern char *eval_user __P((struct request_info *));	/* client user */
extern char *eval_hostname __P((struct host_info *));	/* printable hostname */
extern char *eval_hostaddr __P((struct host_info *));	/* printable host address */
extern char *eval_hostinfo __P((struct host_info *));	/* host name or address */
extern char *eval_client __P((struct request_info *));	/* whatever is available */
extern char *eval_server __P((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. */

/* look up endpoint addresses */
extern void sock_host __P((struct request_info *));
extern void sock_hostnofd __P((struct request_info *));
/* translate address to hostname */
extern void sock_hostname __P((struct host_info *));
/* address to printable address */
extern void sock_hostaddr __P((struct host_info *));

#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)
extern void tli_host __P((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>.
  */

#ifdef __STDC__
extern void tcpd_warn(char *, ...);	/* report problem and proceed */
extern void tcpd_jump(char *, ...);	/* report problem and jump */
#else
extern void tcpd_warn();
extern void tcpd_jump();
#endif

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.
  */

extern void process_options __P((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
extern long fix_inet_addr();
#endif

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

#ifdef RECVFROM_BUG			/* no address family info */
#define recvfrom fix_recvfrom
extern int fix_recvfrom();
#endif

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

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

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

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

__END_DECLS

#endif /* tcpd.h */

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Code Editor : tcpd.h