/* $NetBSD: tcpd.h,v 1.15 2015/10/14 15:54:21 christos Exp $ */ /* * @(#) tcpd.h 1.5 96/03/19 16:22:24 * * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. */ #include <sys/cdefs.h> #include <stdio.h> /* 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) */ struct 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)(void); /* 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 */ __BEGIN_DECLS extern char unknown[]; extern char paranoid[]; __END_DECLS #define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid)) #define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0) /* Global functions. */ __BEGIN_DECLS #define fromhost sock_host /* no TLI support needed */ extern int hosts_access /* access control */ (struct request_info *); extern int hosts_ctl /* limited interface to hosts_access */ (char *, char *, char *, char *); extern void shell_cmd /* execute shell command */ (char *); extern char *percent_x /* do %<char> expansion */ (char *, int, char *, struct request_info *); extern void rfc931 /* client name from RFC 931 daemon */ (struct sockaddr *, struct sockaddr *, char *); __dead extern void clean_exit /* clean up and exit */ (struct request_info *); __dead extern void refuse /* clean up and exit */ (struct request_info *); extern char *xgets /* fgets() on steroids */ (char *, int, FILE *); extern char *split_at /* strchr() and split */ (char *, int); extern int dot_quad_addr /* restricted inet_aton() */ (char *, unsigned long *); /* Global variables. */ extern int allow_severity; /* for connection logging */ extern int deny_severity; /* for connection logging */ extern const char *hosts_allow_table; /* for verification mode redirection */ extern const 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. */ extern struct request_info *request_init /* initialize request */ (struct request_info *,...); extern struct request_info *request_set /* update request structure */ (struct request_info *,...); #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 /* client user */ (struct request_info *); extern char *eval_hostname /* printable hostname */ (struct host_info *); extern char *eval_hostaddr /* printable host address */ (struct host_info *); extern char *eval_hostinfo /* host name or address */ (struct host_info *); extern char *eval_client /* whatever is available */ (struct request_info *); extern char *eval_server /* whatever is available */ (struct request_info *); #define eval_daemon(r) ((r)->daemon) /* daemon process name */ #define eval_pid(r) ((r)->pid) /* process id */ /* Socket-specific methods, including DNS hostname lookups. */ extern void sock_host /* look up endpoint addresses */ (struct request_info *); extern void sock_hostname /* translate address to hostname */ (struct host_info *); extern void sock_hostaddr /* address to printable address */ (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 /* look up endpoint addresses etc. */ (struct request_info *); #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>. */ /* Report problem and proceed */ void tcpd_warn(const char *, ...) __sysloglike(1, 2); /* Report problem and jump */ void tcpd_jump(const char *, ...) __dead __sysloglike(1, 2); __END_DECLS struct tcpd_context { const char *file; /* current file */ int line; /* current line */ }; __BEGIN_DECLS extern struct tcpd_context tcpd_context; __END_DECLS /* * 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. */ __BEGIN_DECLS extern void process_options /* execute options */ (char *, struct request_info *); extern int dry_run; /* verification flag */ extern void fix_options /* get rid of IP-level socket options */ (struct request_info *); __END_DECLS
