1 /*
2 * Copyright 2001 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5 #pragma ident "%Z%%M% %I% %E% SMI"
6
7 /*
8 * @(#) tcpd.h 1.5 96/03/19 16:22:24
9 *
10 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
11 */
12
13 /*
14 * HAVE_IPV6 is traditionally configured at tcp_wrappers build time but for
15 * Solaris it must always be defined to keep the library interface binary
16 * compatible.
17 */
18 #define HAVE_IPV6
19
20 /* Structure to describe one communications endpoint. */
21
22 #define STRING_LENGTH 128 /* hosts, users, processes */
23
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26
27 typedef struct sockaddr_gen {
28 union {
29 struct sockaddr _sg_sa;
30 struct sockaddr_in _sg_sin;
31 #ifdef HAVE_IPV6
32 struct sockaddr_in6 _sg_sin6;
33 #endif
34 } sg_addr;
35 } sockaddr_gen;
36
37 typedef union gen_addr {
38 struct in_addr ga_in;
39 #ifdef HAVE_IPV6
40 struct in6_addr ga_in6;
41 #endif
42 } gen_addr;
43
44 extern void sockgen_simplify();
45
46 #define sg_sa sg_addr._sg_sa
47 #define sg_sin sg_addr._sg_sin
48 #define sg_sin6 sg_addr._sg_sin6
49 #define sg_family sg_sa.sa_family
50 #ifdef HAVE_IPV6
51 #define SGADDRSZ(sag) ((sag)->sg_family == AF_INET6 ? \
52 sizeof (struct in6_addr) : \
53 sizeof (struct in_addr))
54 #define SGSOCKADDRSZ(sag) ((sag)->sg_family == AF_INET6 ? \
55 sizeof (struct sockaddr_in6) : \
56 sizeof (struct sockaddr_in))
57 #define SGPORT(sag) (*((sag)->sg_family == AF_INET6 ? \
58 &(sag)->sg_sin6.sin6_port : \
59 &(sag)->sg_sin.sin_port))
60 #define SGADDRP(sag) (((sag)->sg_family == AF_INET6 ? \
61 (char *) &(sag)->sg_sin6.sin6_addr : \
62 (char *) &(sag)->sg_sin.sin_addr))
63 #define SGFAM(sag) ((sag)->sg_family == AF_INET6 ? \
64 AF_INET6 : AF_INET)
65
66 #define SG_IS_UNSPECIFIED(sag) \
67 ((sag)->sg_family == AF_INET6 ? \
68 IN6_IS_ADDR_UNSPECIFIED(&(sag)->sg_sin6.sin6_addr) : \
69 (sag)->sg_sin.sin_addr.s_addr == 0)
70
71 #define VALID_ADDRTYPE(t) ((t) == AF_INET || (t) == AF_INET6)
72
73 #ifndef IPV6_ABITS
74 #define IPV6_ABITS 128 /* Size of IPV6 address in bits */
75 #endif
76
77 #else /* HAVE_IPV6 */
78
79 #define SGADDRSZ(sag) sizeof(struct in_addr)
80 #define SGSOCKADDRSZ(sag) sizeof(struct sockaddr_in)
81 #define SGPORT(sag) ((sag)->sg_sin.sin_port)
82 #define SGADDRP(sag) ((char*) &(sag)->sg_sin.sin_addr)
83 #define SGFAM(sag) AF_INET
84 #define SG_IS_UNSPECIFIED(sag) ((sag)->sg_sin.sin_addr.s_addr == 0)
85
86 #define VALID_ADDRTYPE(t) ((t) == AF_INET)
87
88 #endif /* HAVE_IPV6 */
89
90 struct host_info {
91 char name[STRING_LENGTH]; /* access via eval_hostname(host) */
92 char addr[STRING_LENGTH]; /* access via eval_hostaddr(host) */
93 struct sockaddr_gen *sin; /* socket address or 0 */
94 struct t_unitdata *unit; /* TLI transport address or 0 */
95 struct request_info *request; /* for shared information */
96 };
97
98 /* Structure to describe what we know about a service request. */
99
100 struct request_info {
101 int fd; /* socket handle */
102 char user[STRING_LENGTH]; /* access via eval_user(request) */
103 char daemon[STRING_LENGTH]; /* access via eval_daemon(request) */
104 char pid[10]; /* access via eval_pid(request) */
105 struct host_info client[1]; /* client endpoint info */
106 struct host_info server[1]; /* server endpoint info */
107 void (*sink) (); /* datagram sink function or 0 */
108 void (*hostname) (); /* address to printable hostname */
109 void (*hostaddr) (); /* address to printable address */
110 void (*cleanup) (); /* cleanup function or 0 */
111 struct netconfig *config; /* netdir handle */
112 };
113
114 /* Common string operations. Less clutter should be more readable. */
115
116 #define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; }
117
118 #define STRN_EQ(x,y,l) (strncasecmp((x),(y),(l)) == 0)
119 #define STRN_NE(x,y,l) (strncasecmp((x),(y),(l)) != 0)
120 #define STR_EQ(x,y) (strcasecmp((x),(y)) == 0)
121 #define STR_NE(x,y) (strcasecmp((x),(y)) != 0)
122
123 /*
124 * Initially, all above strings have the empty value. Information that
125 * cannot be determined at runtime is set to "unknown", so that we can
126 * distinguish between `unavailable' and `not yet looked up'. A hostname
127 * that we do not believe in is set to "paranoid".
128 */
129
130 #define STRING_UNKNOWN "unknown" /* lookup failed */
131 #define STRING_PARANOID "paranoid" /* hostname conflict */
132
133 extern char unknown[];
134 extern char paranoid[];
135
136 #define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))
137
138 #ifdef HAVE_IPV6
139 #define NOT_INADDR(s) (strchr(s,':') == 0 && s[strspn(s,"0123456789./")] != 0)
140 #else
141 #define NOT_INADDR(s) (s[strspn(s,"0123456789./")] != 0)
142 #endif
143
144 /* Global functions. */
145
146 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
147 extern void fromhost(); /* get/validate client host info */
148 #else
149 #define fromhost sock_host /* no TLI support needed */
150 #endif
151
152 extern int hosts_access(); /* access control */
153 extern void shell_cmd(); /* execute shell command */
154 extern char *percent_x(); /* do %<char> expansion */
155 extern void rfc931(); /* client name from RFC 931 daemon */
156 extern void clean_exit(); /* clean up and exit */
157 extern void refuse(); /* clean up and exit */
158 extern char *xgets(); /* fgets() on steroids */
159 extern char *split_at(); /* strchr() and split */
160 extern unsigned long dot_quad_addr(); /* restricted inet_addr() */
161 extern int numeric_addr(); /* IP4/IP6 inet_addr (restricted) */
162 extern struct hostent *tcpd_gethostbyname();
163 /* IP4/IP6 gethostbyname */
164 #ifdef HAVE_IPV6
165 extern char *skip_ipv6_addrs(); /* skip over colons in IPv6 addrs */
166 #else
167 #define skip_ipv6_addrs(x) x
168 #endif
169
170 /* Global variables. */
171
172 extern int allow_severity; /* for connection logging */
173 extern int deny_severity; /* for connection logging */
174 extern char *hosts_allow_table; /* for verification mode redirection */
175 extern char *hosts_deny_table; /* for verification mode redirection */
176 extern int hosts_access_verbose; /* for verbose matching mode */
177 extern int rfc931_timeout; /* user lookup timeout */
178 extern int resident; /* > 0 if resident process */
179
180 /*
181 * Routines for controlled initialization and update of request structure
182 * attributes. Each attribute has its own key.
183 */
184
185 #ifdef __STDC__
186 extern struct request_info *request_init(struct request_info *,...);
187 extern struct request_info *request_set(struct request_info *,...);
188 #else
189 extern struct request_info *request_init(); /* initialize request */
190 extern struct request_info *request_set(); /* update request structure */
191 #endif
192
193 #define RQ_FILE 1 /* file descriptor */
194 #define RQ_DAEMON 2 /* server process (argv[0]) */
195 #define RQ_USER 3 /* client user name */
196 #define RQ_CLIENT_NAME 4 /* client host name */
197 #define RQ_CLIENT_ADDR 5 /* client host address */
198 #define RQ_CLIENT_SIN 6 /* client endpoint (internal) */
199 #define RQ_SERVER_NAME 7 /* server host name */
200 #define RQ_SERVER_ADDR 8 /* server host address */
201 #define RQ_SERVER_SIN 9 /* server endpoint (internal) */
202
203 /*
204 * Routines for delayed evaluation of request attributes. Each attribute
205 * type has its own access method. The trivial ones are implemented by
206 * macros. The other ones are wrappers around the transport-specific host
207 * name, address, and client user lookup methods. The request_info and
208 * host_info structures serve as caches for the lookup results.
209 */
210
211 extern char *eval_user(); /* client user */
212 extern char *eval_hostname(); /* printable hostname */
213 extern char *eval_hostaddr(); /* printable host address */
214 extern char *eval_hostinfo(); /* host name or address */
215 extern char *eval_client(); /* whatever is available */
216 extern char *eval_server(); /* whatever is available */
217 #define eval_daemon(r) ((r)->daemon) /* daemon process name */
218 #define eval_pid(r) ((r)->pid) /* process id */
219
220 /* Socket-specific methods, including DNS hostname lookups. */
221
222 extern void sock_host(); /* look up endpoint addresses */
223 extern void sock_hostname(); /* translate address to hostname */
224 extern void sock_hostaddr(); /* address to printable address */
225 #define sock_methods(r) \
226 { (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }
227
228 /* The System V Transport-Level Interface (TLI) interface. */
229
230 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
231 extern void tli_host(); /* look up endpoint addresses etc. */
232 #endif
233
234 /*
235 * Problem reporting interface. Additional file/line context is reported
236 * when available. The jump buffer (tcpd_buf) is not declared here, or
237 * everyone would have to include <setjmp.h>.
238 */
239
240 #ifdef __STDC__
241 extern void tcpd_warn(char *, ...); /* report problem and proceed */
242 extern void tcpd_jump(char *, ...); /* report problem and jump */
243 #else
244 extern void tcpd_warn();
245 extern void tcpd_jump();
246 #endif
247
248 struct tcpd_context {
249 char *file; /* current file */
250 int line; /* current line */
251 };
252 extern struct tcpd_context tcpd_context;
253
254 /*
255 * While processing access control rules, error conditions are handled by
256 * jumping back into the hosts_access() routine. This is cleaner than
257 * checking the return value of each and every silly little function. The
258 * (-1) returns are here because zero is already taken by longjmp().
259 */
260
261 #define AC_PERMIT 1 /* permit access */
262 #define AC_DENY (-1) /* deny_access */
263 #define AC_ERROR AC_DENY /* XXX */
264
265 /*
266 * In verification mode an option function should just say what it would do,
267 * instead of really doing it. An option function that would not return
268 * should clear the dry_run flag to inform the caller of this unusual
269 * behavior.
270 */
271
272 extern void process_options(); /* execute options */
273 extern int dry_run; /* verification flag */
274
275 /* Bug workarounds. */
276
277 #ifdef INET_ADDR_BUG /* inet_addr() returns struct */
278 #define inet_addr fix_inet_addr
279 extern long fix_inet_addr();
280 #endif
281
282 #ifdef BROKEN_FGETS /* partial reads from sockets */
283 #define fgets fix_fgets
284 extern char *fix_fgets();
285 #endif
286
287 #ifdef RECVFROM_BUG /* no address family info */
288 #define recvfrom fix_recvfrom
289 extern int fix_recvfrom();
290 #endif
291
292 #ifdef GETPEERNAME_BUG /* claims success with UDP */
293 #define getpeername fix_getpeername
294 extern int fix_getpeername();
295 #endif
296
297 #ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */
298 #define gethostbyname fix_gethostbyname
299 extern struct hostent *fix_gethostbyname();
300 #endif
301
302 #ifdef USE_STRSEP /* libc calls strtok() */
303 #define strtok fix_strtok
304 extern char *fix_strtok();
305 #endif
306
307 #ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */
308 #define strtok my_strtok
309 extern char *my_strtok();
310 #endif