1 /* "net_db.c" network database support
2 * Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2, or (at your option)
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this software; see the file COPYING. If not, write to
16 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 * Boston, MA 02111-1307 USA
19 * As a special exception, the Free Software Foundation gives permission
20 * for additional uses of the text contained in its release of GUILE.
22 * The exception is that, if you link the GUILE library with other files
23 * to produce an executable, this does not by itself cause the
24 * resulting executable to be covered by the GNU General Public License.
25 * Your use of that executable is in no way restricted on account of
26 * linking the GUILE library code into it.
28 * This exception does not however invalidate any other reasons why
29 * the executable file might be covered by the GNU General Public License.
31 * This exception applies only to the code released by the
32 * Free Software Foundation under the name GUILE. If you copy
33 * code from other Free Software Foundation releases into a copy of
34 * GUILE, as the General Public License permits, the exception does
35 * not apply to the code that you add in this way. To avoid misleading
36 * anyone as to the status of such modified files, you must delete
37 * this exception notice from them.
39 * If you write modifications of your own for GUILE, it is your choice
40 * whether to permit this exception to apply to your modifications.
41 * If you do not wish that, delete this exception notice. */
45 /* Written in 1994 by Aubrey Jaffer.
46 * Thanks to Hallvard.Tretteberg@si.sintef.no for inspiration and discussion.
47 * Rewritten by Gary Houston to be a closer interface to the C socket library.
48 * Split into net_db.c and socket.c.
54 #include "libguile/_scm.h"
55 #include "libguile/feature.h"
56 #include "libguile/strings.h"
57 #include "libguile/vectors.h"
59 #include "libguile/validate.h"
60 #include "libguile/net_db.h"
66 #include <sys/types.h>
68 #ifdef HAVE_WINSOCK2_H
71 #include <sys/socket.h>
73 #include <netinet/in.h>
74 #include <arpa/inet.h>
77 #if !defined (HAVE_H_ERRNO) && !defined (__MINGW32__)
78 /* h_errno not found in netdb.h, maybe this will help. */
84 SCM_SYMBOL (scm_host_not_found_key
, "host-not-found");
85 SCM_SYMBOL (scm_try_again_key
, "try-again");
86 SCM_SYMBOL (scm_no_recovery_key
, "no-recovery");
87 SCM_SYMBOL (scm_no_data_key
, "no-data");
89 static void scm_resolv_error (const char *subr
, SCM bad_value
)
92 if (h_errno
== NETDB_INTERNAL
)
94 /* errno supposedly contains a useful value. */
106 key
= scm_host_not_found_key
;
107 errmsg
= "Unknown host";
110 key
= scm_try_again_key
;
111 errmsg
= "Host name lookup failure";
114 key
= scm_no_recovery_key
;
115 errmsg
= "Unknown server error";
118 key
= scm_no_data_key
;
119 errmsg
= "No address associated with name";
122 scm_misc_error (subr
, "Unknown resolver error", SCM_EOL
);
126 #ifdef HAVE_HSTRERROR
127 errmsg
= (const char *) hstrerror (h_errno
);
129 scm_error (key
, subr
, errmsg
, scm_cons (bad_value
, SCM_EOL
), SCM_EOL
);
133 /* Should take an extra arg for address format (will be needed for IPv6).
134 Should use reentrant facilities if available.
137 SCM_DEFINE (scm_gethost
, "gethost", 0, 1, 0,
139 "@deffnx procedure gethostbyname hostname\n"
140 "@deffnx procedure gethostbyaddr address\n"
141 "Look up a host by name or address, returning a host object. The\n"
142 "@code{gethost} procedure will accept either a string name or an integer\n"
143 "address; if given no arguments, it behaves like @code{gethostent} (see\n"
144 "below). If a name or address is supplied but the address can not be\n"
145 "found, an error will be thrown to one of the keys:\n"
146 "@code{host-not-found}, @code{try-again}, @code{no-recovery} or\n"
147 "@code{no-data}, corresponding to the equivalent @code{h_error} values.\n"
148 "Unusual conditions may result in errors thrown to the\n"
149 "@code{system-error} or @code{misc_error} keys.")
150 #define FUNC_NAME s_scm_gethost
152 SCM ans
= scm_c_make_vector (5, SCM_UNSPECIFIED
);
153 SCM
*ve
= SCM_VELTS (ans
);
155 struct hostent
*entry
;
159 if (SCM_UNBNDP (host
))
161 #ifdef HAVE_GETHOSTENT
162 entry
= gethostent ();
168 /* As far as I can tell, there's no good way to tell whether
169 zero means an error or end-of-file. The trick of
170 clearing errno before calling gethostent and checking it
171 afterwards doesn't cut it, because, on Linux, it seems to
172 try to contact some other server (YP?) and fails, which
173 is a benign failure. */
177 else if (SCM_STRINGP (host
))
179 entry
= gethostbyname (SCM_STRING_CHARS (host
));
183 inad
.s_addr
= htonl (SCM_NUM2ULONG (1, host
));
184 entry
= gethostbyaddr ((char *) &inad
, sizeof (inad
), AF_INET
);
187 scm_resolv_error (FUNC_NAME
, host
);
189 ve
[0] = scm_mem2string (entry
->h_name
, strlen (entry
->h_name
));
190 ve
[1] = scm_makfromstrs (-1, entry
->h_aliases
);
191 ve
[2] = SCM_MAKINUM (entry
->h_addrtype
+ 0L);
192 ve
[3] = SCM_MAKINUM (entry
->h_length
+ 0L);
193 if (sizeof (struct in_addr
) != entry
->h_length
)
198 for (argv
= entry
->h_addr_list
; argv
[i
]; i
++);
201 inad
= *(struct in_addr
*) argv
[i
];
202 lst
= scm_cons (scm_ulong2num (ntohl (inad
.s_addr
)), lst
);
210 /* In all subsequent getMUMBLE functions, when we're called with no
211 arguments, we're supposed to traverse the tables entry by entry.
212 However, there doesn't seem to be any documented way to distinguish
213 between end-of-table and an error; in both cases the functions
214 return zero. Gotta love Unix. For the time being, we clear errno,
215 and if we get a zero and errno is set, we signal an error. This
216 doesn't seem quite right (what if errno gets set as part of healthy
217 operation?), but it seems to work okay. We'll see. */
219 #if defined(HAVE_GETNETENT) && defined(HAVE_GETNETBYNAME) && defined(HAVE_GETNETBYADDR)
220 SCM_DEFINE (scm_getnet
, "getnet", 0, 1, 0,
222 "@deffnx procedure getnetbyname net-name\n"
223 "@deffnx procedure getnetbyaddr net-number\n"
224 "Look up a network by name or net number in the network database. The\n"
225 "@var{net-name} argument must be a string, and the @var{net-number}\n"
226 "argument must be an integer. @code{getnet} will accept either type of\n"
227 "argument, behaving like @code{getnetent} (see below) if no arguments are\n"
229 #define FUNC_NAME s_scm_getnet
233 struct netent
*entry
;
235 ans
= scm_c_make_vector (4, SCM_UNSPECIFIED
);
236 ve
= SCM_VELTS (ans
);
237 if (SCM_UNBNDP (net
))
239 entry
= getnetent ();
242 /* There's no good way to tell whether zero means an error
243 or end-of-file, so we always return #f. See `gethost'
248 else if (SCM_STRINGP (net
))
250 entry
= getnetbyname (SCM_STRING_CHARS (net
));
254 unsigned long netnum
;
255 netnum
= SCM_NUM2ULONG (1, net
);
256 entry
= getnetbyaddr (netnum
, AF_INET
);
259 SCM_SYSERROR_MSG ("no such network ~A", scm_list_1 (net
), errno
);
260 ve
[0] = scm_mem2string (entry
->n_name
, strlen (entry
->n_name
));
261 ve
[1] = scm_makfromstrs (-1, entry
->n_aliases
);
262 ve
[2] = SCM_MAKINUM (entry
->n_addrtype
+ 0L);
263 ve
[3] = scm_ulong2num (entry
->n_net
+ 0L);
269 #ifdef HAVE_GETPROTOENT
270 SCM_DEFINE (scm_getproto
, "getproto", 0, 1, 0,
272 "@deffnx procedure getprotobyname name\n"
273 "@deffnx procedure getprotobynumber number\n"
274 "Look up a network protocol by name or by number. @code{getprotobyname}\n"
275 "takes a string argument, and @code{getprotobynumber} takes an integer\n"
276 "argument. @code{getproto} will accept either type, behaving like\n"
277 "@code{getprotoent} (see below) if no arguments are supplied.")
278 #define FUNC_NAME s_scm_getproto
282 struct protoent
*entry
;
284 ans
= scm_c_make_vector (3, SCM_UNSPECIFIED
);
285 ve
= SCM_VELTS (ans
);
286 if (SCM_UNBNDP (protocol
))
288 entry
= getprotoent ();
291 /* There's no good way to tell whether zero means an error
292 or end-of-file, so we always return #f. See `gethost'
297 else if (SCM_STRINGP (protocol
))
299 entry
= getprotobyname (SCM_STRING_CHARS (protocol
));
303 unsigned long protonum
;
304 protonum
= SCM_NUM2ULONG (1, protocol
);
305 entry
= getprotobynumber (protonum
);
308 SCM_SYSERROR_MSG ("no such protocol ~A", scm_list_1 (protocol
), errno
);
309 ve
[0] = scm_mem2string (entry
->p_name
, strlen (entry
->p_name
));
310 ve
[1] = scm_makfromstrs (-1, entry
->p_aliases
);
311 ve
[2] = SCM_MAKINUM (entry
->p_proto
+ 0L);
318 scm_return_entry (struct servent
*entry
)
323 ans
= scm_c_make_vector (4, SCM_UNSPECIFIED
);
324 ve
= SCM_VELTS (ans
);
325 ve
[0] = scm_mem2string (entry
->s_name
, strlen (entry
->s_name
));
326 ve
[1] = scm_makfromstrs (-1, entry
->s_aliases
);
327 ve
[2] = SCM_MAKINUM (ntohs (entry
->s_port
) + 0L);
328 ve
[3] = scm_mem2string (entry
->s_proto
, strlen (entry
->s_proto
));
332 #ifdef HAVE_GETSERVENT
333 SCM_DEFINE (scm_getserv
, "getserv", 0, 2, 0,
334 (SCM name
, SCM protocol
),
335 "@deffnx procedure getservbyname name protocol\n"
336 "@deffnx procedure getservbyport port protocol\n"
337 "Look up a network service by name or by service number, and return a\n"
338 "network service object. The @var{protocol} argument specifies the name\n"
339 "of the desired protocol; if the protocol found in the network service\n"
340 "database does not match this name, a system error is signalled.\n\n"
341 "The @code{getserv} procedure will take either a service name or number\n"
342 "as its first argument; if given no arguments, it behaves like\n"
343 "@code{getservent} (see below).")
344 #define FUNC_NAME s_scm_getserv
346 struct servent
*entry
;
347 if (SCM_UNBNDP (name
))
349 entry
= getservent ();
352 /* There's no good way to tell whether zero means an error
353 or end-of-file, so we always return #f. See `gethost'
357 return scm_return_entry (entry
);
359 SCM_VALIDATE_STRING (2, protocol
);
360 if (SCM_STRINGP (name
))
362 entry
= getservbyname (SCM_STRING_CHARS (name
), SCM_STRING_CHARS (protocol
));
366 SCM_VALIDATE_INUM (1,name
);
367 entry
= getservbyport (htons (SCM_INUM (name
)), SCM_STRING_CHARS (protocol
));
370 SCM_SYSERROR_MSG("no such service ~A", scm_list_1 (name
), errno
);
371 return scm_return_entry (entry
);
376 #if defined(HAVE_SETHOSTENT) && defined(HAVE_ENDHOSTENT)
377 SCM_DEFINE (scm_sethost
, "sethost", 0, 1, 0,
379 "If @var{stayopen} is omitted, this is equivalent to @code{endhostent}.\n"
380 "Otherwise it is equivalent to @code{sethostent stayopen}.")
381 #define FUNC_NAME s_scm_sethost
383 if (SCM_UNBNDP (stayopen
))
386 sethostent (!SCM_FALSEP (stayopen
));
387 return SCM_UNSPECIFIED
;
392 #if defined(HAVE_SETNETENT) && defined(HAVE_ENDNETENT)
393 SCM_DEFINE (scm_setnet
, "setnet", 0, 1, 0,
395 "If @var{stayopen} is omitted, this is equivalent to @code{endnetent}.\n"
396 "Otherwise it is equivalent to @code{setnetent stayopen}.")
397 #define FUNC_NAME s_scm_setnet
399 if (SCM_UNBNDP (stayopen
))
402 setnetent (!SCM_FALSEP (stayopen
));
403 return SCM_UNSPECIFIED
;
408 #if defined(HAVE_SETPROTOENT) && defined(HAVE_ENDPROTOENT)
409 SCM_DEFINE (scm_setproto
, "setproto", 0, 1, 0,
411 "If @var{stayopen} is omitted, this is equivalent to @code{endprotoent}.\n"
412 "Otherwise it is equivalent to @code{setprotoent stayopen}.")
413 #define FUNC_NAME s_scm_setproto
415 if (SCM_UNBNDP (stayopen
))
418 setprotoent (!SCM_FALSEP (stayopen
));
419 return SCM_UNSPECIFIED
;
424 #if defined(HAVE_SETSERVENT) && defined(HAVE_ENDSERVENT)
425 SCM_DEFINE (scm_setserv
, "setserv", 0, 1, 0,
427 "If @var{stayopen} is omitted, this is equivalent to @code{endservent}.\n"
428 "Otherwise it is equivalent to @code{setservent stayopen}.")
429 #define FUNC_NAME s_scm_setserv
431 if (SCM_UNBNDP (stayopen
))
434 setservent (!SCM_FALSEP (stayopen
));
435 return SCM_UNSPECIFIED
;
444 scm_add_feature ("net-db");
445 #ifndef SCM_MAGIC_SNARFER
446 #include "libguile/net_db.x"