2 * @(#) tcpd.h 1.5 96/03/19 16:22:24
4 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
6 * $FreeBSD: src/contrib/tcp_wrappers/tcpd.h,v 1.2 2000/02/03 10:26:59 shin Exp $
7 * $DragonFly: src/contrib/tcp_wrappers/tcpd.h,v 1.3 2005/09/04 01:53:07 sephe Exp $
10 #ifndef _LIBWRAP_TCPD_H
11 #define _LIBWRAP_TCPD_H
13 #include <sys/cdefs.h>
15 /* Structure to describe one communications endpoint. */
17 #define STRING_LENGTH 128 /* hosts, users, processes */
20 char name[STRING_LENGTH]; /* access via eval_hostname(host) */
21 char addr[STRING_LENGTH]; /* access via eval_hostaddr(host) */
23 struct sockaddr *sin; /* socket address or 0 */
25 struct sockaddr_in *sin; /* socket address or 0 */
27 struct t_unitdata *unit; /* TLI transport address or 0 */
28 struct request_info *request; /* for shared information */
31 /* Structure to describe what we know about a service request. */
34 int fd; /* socket handle */
35 char user[STRING_LENGTH]; /* access via eval_user(request) */
36 char daemon[STRING_LENGTH]; /* access via eval_daemon(request) */
37 char pid[10]; /* access via eval_pid(request) */
38 struct host_info client[1]; /* client endpoint info */
39 struct host_info server[1]; /* server endpoint info */
40 void (*sink) (int); /* datagram sink function or 0 */
41 void (*hostname) /* address to printable hostname */
43 void (*hostaddr) /* address to printable address */
45 void (*cleanup) (void); /* cleanup function or 0 */
46 struct netconfig *config; /* netdir handle */
49 /* Common string operations. Less clutter should be more readable. */
51 #define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; }
53 #define STRN_EQ(x,y,l) (strncasecmp((x),(y),(l)) == 0)
54 #define STRN_NE(x,y,l) (strncasecmp((x),(y),(l)) != 0)
55 #define STR_EQ(x,y) (strcasecmp((x),(y)) == 0)
56 #define STR_NE(x,y) (strcasecmp((x),(y)) != 0)
59 * Initially, all above strings have the empty value. Information that
60 * cannot be determined at runtime is set to "unknown", so that we can
61 * distinguish between `unavailable' and `not yet looked up'. A hostname
62 * that we do not believe in is set to "paranoid".
65 #define STRING_UNKNOWN "unknown" /* lookup failed */
66 #define STRING_PARANOID "paranoid" /* hostname conflict */
69 extern char unknown[];
70 extern char paranoid[];
73 #define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))
75 #define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0)
77 /* Global functions. */
80 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
81 extern void fromhost(); /* get/validate client host info */
83 #define fromhost sock_host /* no TLI support needed */
86 int hosts_access(struct request_info *);/* access control */
87 void shell_cmd(char *); /* execute shell command */
88 char *percent_x(char *, int, char *, struct request_info *);/* do %<char> expansion */
89 void rfc931(struct sockaddr *, struct sockaddr *, char *);/* client name from RFC 931 daemon */
90 void clean_exit(struct request_info *);/* clean up and exit */
91 void refuse(struct request_info *); /* clean up and exit */
92 char *xgets(char *, int, FILE *); /* fgets() on steroids */
93 char *split_at(char *, int); /* strchr() and split */
94 unsigned long dot_quad_addr(char *); /* restricted inet_addr() */
96 /* Global variables. */
98 extern int allow_severity; /* for connection logging */
99 extern int deny_severity; /* for connection logging */
100 extern char *hosts_allow_table; /* for verification mode redirection */
101 extern char *hosts_deny_table; /* for verification mode redirection */
102 extern int hosts_access_verbose; /* for verbose matching mode */
103 extern int rfc931_timeout; /* user lookup timeout */
104 extern int resident; /* > 0 if resident process */
107 * Routines for controlled initialization and update of request structure
108 * attributes. Each attribute has its own key.
111 struct request_info *request_init(struct request_info *,...);/* initialize request */
112 struct request_info *request_set(struct request_info *,...);/* update request structure */
114 #define RQ_FILE 1 /* file descriptor */
115 #define RQ_DAEMON 2 /* server process (argv[0]) */
116 #define RQ_USER 3 /* client user name */
117 #define RQ_CLIENT_NAME 4 /* client host name */
118 #define RQ_CLIENT_ADDR 5 /* client host address */
119 #define RQ_CLIENT_SIN 6 /* client endpoint (internal) */
120 #define RQ_SERVER_NAME 7 /* server host name */
121 #define RQ_SERVER_ADDR 8 /* server host address */
122 #define RQ_SERVER_SIN 9 /* server endpoint (internal) */
125 * Routines for delayed evaluation of request attributes. Each attribute
126 * type has its own access method. The trivial ones are implemented by
127 * macros. The other ones are wrappers around the transport-specific host
128 * name, address, and client user lookup methods. The request_info and
129 * host_info structures serve as caches for the lookup results.
132 char *eval_user(struct request_info *); /* client user */
133 char *eval_hostname(struct host_info *); /* printable hostname */
134 char *eval_hostaddr(struct host_info *); /* printable host address */
135 char *eval_hostinfo(struct host_info *); /* host name or address */
136 char *eval_client(struct request_info *); /* whatever is available */
137 char *eval_server(struct request_info *); /* whatever is available */
138 #define eval_daemon(r) ((r)->daemon) /* daemon process name */
139 #define eval_pid(r) ((r)->pid) /* process id */
141 /* Socket-specific methods, including DNS hostname lookups. */
143 void sock_host(struct request_info *); /* look up endpoint addresses */
144 void sock_hostname(struct host_info *); /* translate address to hostname */
145 void sock_hostaddr(struct host_info *); /* address to printable address */
146 #define sock_methods(r) \
147 { (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }
149 /* The System V Transport-Level Interface (TLI) interface. */
151 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
152 extern void tli_host(); /* look up endpoint addresses etc. */
156 * Problem reporting interface. Additional file/line context is reported
157 * when available. The jump buffer (tcpd_buf) is not declared here, or
158 * everyone would have to include <setjmp.h>.
161 void tcpd_warn(char *, ...) __printflike(1, 2); /* report problem and proceed */
162 void tcpd_jump(char *, ...) __printflike(1, 2); /* report problem and jump */
165 struct tcpd_context {
166 char *file; /* current file */
167 int line; /* current line */
170 extern struct tcpd_context tcpd_context;
174 * While processing access control rules, error conditions are handled by
175 * jumping back into the hosts_access() routine. This is cleaner than
176 * checking the return value of each and every silly little function. The
177 * (-1) returns are here because zero is already taken by longjmp().
180 #define AC_PERMIT 1 /* permit access */
181 #define AC_DENY (-1) /* deny_access */
182 #define AC_ERROR AC_DENY /* XXX */
185 * In verification mode an option function should just say what it would do,
186 * instead of really doing it. An option function that would not return
187 * should clear the dry_run flag to inform the caller of this unusual
192 void process_options(char *, struct request_info *); /* execute options */
193 extern int dry_run; /* verification flag */
195 /* Bug workarounds. */
197 #ifdef INET_ADDR_BUG /* inet_addr() returns struct */
198 #define inet_addr fix_inet_addr
199 extern long fix_inet_addr();
202 #ifdef BROKEN_FGETS /* partial reads from sockets */
203 #define fgets fix_fgets
204 extern char *fix_fgets();
207 #ifdef RECVFROM_BUG /* no address family info */
208 #define recvfrom fix_recvfrom
209 extern int fix_recvfrom();
212 #ifdef GETPEERNAME_BUG /* claims success with UDP */
213 #define getpeername fix_getpeername
214 extern int fix_getpeername();
217 #ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */
218 #define gethostbyname fix_gethostbyname
219 extern struct hostent *fix_gethostbyname();
222 #ifdef USE_STRSEP /* libc calls strtok() */
223 #define strtok fix_strtok
224 extern char *fix_strtok();
227 #ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */
228 #define strtok my_strtok
229 extern char *my_strtok();
233 #endif /* !_LIBWRAP_TCPD_H */