220 lines
7.7 KiB
C
220 lines
7.7 KiB
C
/*
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* @(#) tcpd.h 1.5 96/03/19 16:22:24
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*/
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/* Structure to describe one communications endpoint. */
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#define STRING_LENGTH 128 /* hosts, users, processes */
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struct host_info {
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char name[STRING_LENGTH]; /* access via eval_hostname(host) */
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char addr[STRING_LENGTH]; /* access via eval_hostaddr(host) */
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struct sockaddr_in *sin; /* socket address or 0 */
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struct t_unitdata *unit; /* TLI transport address or 0 */
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struct request_info *request; /* for shared information */
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};
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/* Structure to describe what we know about a service request. */
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struct request_info {
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int fd; /* socket handle */
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char user[STRING_LENGTH]; /* access via eval_user(request) */
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char daemon[STRING_LENGTH]; /* access via eval_daemon(request) */
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char pid[10]; /* access via eval_pid(request) */
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struct host_info client[1]; /* client endpoint info */
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struct host_info server[1]; /* server endpoint info */
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void (*sink) (); /* datagram sink function or 0 */
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void (*hostname) (); /* address to printable hostname */
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void (*hostaddr) (); /* address to printable address */
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void (*cleanup) (); /* cleanup function or 0 */
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struct netconfig *config; /* netdir handle */
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};
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/* Common string operations. Less clutter should be more readable. */
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#define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; }
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#define STRN_EQ(x,y,l) (strncasecmp((x),(y),(l)) == 0)
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#define STRN_NE(x,y,l) (strncasecmp((x),(y),(l)) != 0)
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#define STR_EQ(x,y) (strcasecmp((x),(y)) == 0)
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#define STR_NE(x,y) (strcasecmp((x),(y)) != 0)
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/*
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* Initially, all above strings have the empty value. Information that
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* cannot be determined at runtime is set to "unknown", so that we can
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* distinguish between `unavailable' and `not yet looked up'. A hostname
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* that we do not believe in is set to "paranoid".
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*/
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#define STRING_UNKNOWN "unknown" /* lookup failed */
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#define STRING_PARANOID "paranoid" /* hostname conflict */
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extern char unknown[];
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extern char paranoid[];
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#define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))
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#define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0)
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/* Global functions. */
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#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
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extern void fromhost(); /* get/validate client host info */
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#else
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#define fromhost sock_host /* no TLI support needed */
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#endif
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extern int hosts_access(); /* access control */
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extern void shell_cmd(); /* execute shell command */
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extern char *percent_x(); /* do %<char> expansion */
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extern void rfc931(); /* client name from RFC 931 daemon */
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extern void clean_exit(); /* clean up and exit */
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extern void refuse(); /* clean up and exit */
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extern char *xgets(); /* fgets() on steroids */
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extern char *split_at(); /* strchr() and split */
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extern unsigned long dot_quad_addr(); /* restricted inet_addr() */
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/* Global variables. */
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extern int allow_severity; /* for connection logging */
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extern int deny_severity; /* for connection logging */
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extern char *hosts_allow_table; /* for verification mode redirection */
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extern char *hosts_deny_table; /* for verification mode redirection */
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extern int hosts_access_verbose; /* for verbose matching mode */
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extern int rfc931_timeout; /* user lookup timeout */
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extern int resident; /* > 0 if resident process */
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/*
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* Routines for controlled initialization and update of request structure
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* attributes. Each attribute has its own key.
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*/
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#ifdef __STDC__
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extern struct request_info *request_init(struct request_info *,...);
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extern struct request_info *request_set(struct request_info *,...);
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#else
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extern struct request_info *request_init(); /* initialize request */
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extern struct request_info *request_set(); /* update request structure */
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#endif
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#define RQ_FILE 1 /* file descriptor */
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#define RQ_DAEMON 2 /* server process (argv[0]) */
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#define RQ_USER 3 /* client user name */
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#define RQ_CLIENT_NAME 4 /* client host name */
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#define RQ_CLIENT_ADDR 5 /* client host address */
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#define RQ_CLIENT_SIN 6 /* client endpoint (internal) */
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#define RQ_SERVER_NAME 7 /* server host name */
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#define RQ_SERVER_ADDR 8 /* server host address */
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#define RQ_SERVER_SIN 9 /* server endpoint (internal) */
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/*
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* Routines for delayed evaluation of request attributes. Each attribute
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* type has its own access method. The trivial ones are implemented by
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* macros. The other ones are wrappers around the transport-specific host
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* name, address, and client user lookup methods. The request_info and
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* host_info structures serve as caches for the lookup results.
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*/
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extern char *eval_user(); /* client user */
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extern char *eval_hostname(); /* printable hostname */
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extern char *eval_hostaddr(); /* printable host address */
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extern char *eval_hostinfo(); /* host name or address */
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extern char *eval_client(); /* whatever is available */
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extern char *eval_server(); /* whatever is available */
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#define eval_daemon(r) ((r)->daemon) /* daemon process name */
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#define eval_pid(r) ((r)->pid) /* process id */
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/* Socket-specific methods, including DNS hostname lookups. */
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extern void sock_host(); /* look up endpoint addresses */
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extern void sock_hostname(); /* translate address to hostname */
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extern void sock_hostaddr(); /* address to printable address */
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#define sock_methods(r) \
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{ (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }
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/* The System V Transport-Level Interface (TLI) interface. */
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#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
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extern void tli_host(); /* look up endpoint addresses etc. */
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#endif
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/*
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* Problem reporting interface. Additional file/line context is reported
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* when available. The jump buffer (tcpd_buf) is not declared here, or
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* everyone would have to include <setjmp.h>.
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*/
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#ifdef __STDC__
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extern void tcpd_warn(char *, ...); /* report problem and proceed */
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extern void tcpd_jump(char *, ...); /* report problem and jump */
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#else
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extern void tcpd_warn();
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extern void tcpd_jump();
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#endif
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struct tcpd_context {
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char *file; /* current file */
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int line; /* current line */
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};
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extern struct tcpd_context tcpd_context;
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/*
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* While processing access control rules, error conditions are handled by
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* jumping back into the hosts_access() routine. This is cleaner than
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* checking the return value of each and every silly little function. The
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* (-1) returns are here because zero is already taken by longjmp().
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*/
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#define AC_PERMIT 1 /* permit access */
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#define AC_DENY (-1) /* deny_access */
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#define AC_ERROR AC_DENY /* XXX */
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/*
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* In verification mode an option function should just say what it would do,
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* instead of really doing it. An option function that would not return
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* should clear the dry_run flag to inform the caller of this unusual
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* behavior.
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*/
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extern void process_options(); /* execute options */
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extern int dry_run; /* verification flag */
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/* Bug workarounds. */
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#ifdef INET_ADDR_BUG /* inet_addr() returns struct */
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#define inet_addr fix_inet_addr
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extern long fix_inet_addr();
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#endif
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#ifdef BROKEN_FGETS /* partial reads from sockets */
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#define fgets fix_fgets
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extern char *fix_fgets();
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#endif
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#ifdef RECVFROM_BUG /* no address family info */
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#define recvfrom fix_recvfrom
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extern int fix_recvfrom();
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#endif
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#ifdef GETPEERNAME_BUG /* claims success with UDP */
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#define getpeername fix_getpeername
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extern int fix_getpeername();
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#endif
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#ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */
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#define gethostbyname fix_gethostbyname
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extern struct hostent *fix_gethostbyname();
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#endif
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#ifdef USE_STRSEP /* libc calls strtok() */
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#define strtok fix_strtok
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extern char *fix_strtok();
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#endif
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#ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */
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#define strtok my_strtok
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extern char *my_strtok();
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#endif
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