1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static const char rcsid[] = "$Id: nis_nw.c,v 1.4 2005/04/27 04:56:33 sra Exp $";
20#endif /* LIBC_SCCS and not lint */
21
22/* Imports */
23
24#include "port_before.h"
25
26#ifndef WANT_IRS_NIS
27static int __bind_irs_nis_unneeded;
28#else
29
30#include <sys/types.h>
31#include <sys/socket.h>
32
33#include <netinet/in.h>
34#include <arpa/inet.h>
35#include <arpa/nameser.h>
36#ifdef T_NULL
37#undef T_NULL		/* Silence re-definition warning of T_NULL. */
38#endif
39#include <rpc/rpc.h>
40#include <rpc/xdr.h>
41#include <rpcsvc/yp_prot.h>
42#include <rpcsvc/ypclnt.h>
43
44#include <errno.h>
45#include <resolv.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49
50#include <isc/memcluster.h>
51#include <irs.h>
52
53#include "port_after.h"
54
55#include "irs_p.h"
56#include "nis_p.h"
57
58/* Definitions */
59
60#define MAXALIASES 35
61#define MAXADDRSIZE 4
62
63struct pvt {
64	int		needrewind;
65	char *		nis_domain;
66	char *		curkey_data;
67	int		curkey_len;
68	char *		curval_data;
69	int		curval_len;
70
71	struct nwent 	nwent;
72	char *		nwbuf;
73
74	char *		aliases[MAXALIASES + 1];
75	u_char		addr[MAXADDRSIZE];
76
77	struct __res_state *  res;
78	void		(*free_res)(void *);
79};
80
81enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 };
82
83static /*const*/ char networks_byname[] = "networks.byname";
84static /*const*/ char networks_byaddr[] = "networks.byaddr";
85
86/* Forward */
87
88static void 		nw_close(struct irs_nw *);
89static struct nwent *	nw_byname(struct irs_nw *, const char *, int);
90static struct nwent *	nw_byaddr(struct irs_nw *, void *, int, int);
91static struct nwent *	nw_next(struct irs_nw *);
92static void		nw_rewind(struct irs_nw *);
93static void		nw_minimize(struct irs_nw *);
94static struct __res_state * nw_res_get(struct irs_nw *this);
95static void		nw_res_set(struct irs_nw *this,
96				   struct __res_state *res,
97				   void (*free_res)(void *));
98
99static struct nwent *	makenwent(struct irs_nw *this);
100static void		nisfree(struct pvt *, enum do_what);
101static int		init(struct irs_nw *this);
102
103/* Public */
104
105struct irs_nw *
106irs_nis_nw(struct irs_acc *this) {
107	struct irs_nw *nw;
108	struct pvt *pvt;
109
110	if (!(pvt = memget(sizeof *pvt))) {
111		errno = ENOMEM;
112		return (NULL);
113	}
114	memset(pvt, 0, sizeof *pvt);
115	if (!(nw = memget(sizeof *nw))) {
116		memput(pvt, sizeof *pvt);
117		errno = ENOMEM;
118		return (NULL);
119	}
120	memset(nw, 0x5e, sizeof *nw);
121	pvt->needrewind = 1;
122	pvt->nis_domain = ((struct nis_p *)this->private)->domain;
123	nw->private = pvt;
124	nw->close = nw_close;
125	nw->byname = nw_byname;
126	nw->byaddr = nw_byaddr;
127	nw->next = nw_next;
128	nw->rewind = nw_rewind;
129	nw->minimize = nw_minimize;
130	nw->res_get = nw_res_get;
131	nw->res_set = nw_res_set;
132	return (nw);
133}
134
135/* Methods */
136
137static void
138nw_close(struct irs_nw *this) {
139	struct pvt *pvt = (struct pvt *)this->private;
140
141	nw_minimize(this);
142	if (pvt->res && pvt->free_res)
143		(*pvt->free_res)(pvt->res);
144	if (pvt->nwbuf)
145		free(pvt->nwbuf);
146	memput(pvt, sizeof *pvt);
147	memput(this, sizeof *this);
148}
149
150static struct nwent *
151nw_byaddr(struct irs_nw *this, void *net, int length, int af) {
152	struct pvt *pvt = (struct pvt *)this->private;
153	char tmp[sizeof "255.255.255.255/32"], *t;
154	int r;
155
156	if (init(this) == -1)
157		return (NULL);
158
159	if (af != AF_INET) {
160		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
161		errno = EAFNOSUPPORT;
162		return (NULL);
163	}
164	nisfree(pvt, do_val);
165	/* Try it with /CIDR first. */
166	if (inet_net_ntop(AF_INET, net, length, tmp, sizeof tmp) == NULL) {
167		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
168		return (NULL);
169	}
170	r = yp_match(pvt->nis_domain, networks_byaddr, tmp, strlen(tmp),
171		     &pvt->curval_data, &pvt->curval_len);
172	if (r != 0) {
173		/* Give it a shot without the /CIDR. */
174		if ((t = strchr(tmp, '/')) != NULL) {
175			*t = '\0';
176			r = yp_match(pvt->nis_domain, networks_byaddr,
177				     tmp, strlen(tmp),
178				     &pvt->curval_data, &pvt->curval_len);
179		}
180		if (r != 0) {
181			RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
182			return (NULL);
183		}
184	}
185	return (makenwent(this));
186}
187
188static struct nwent *
189nw_byname(struct irs_nw *this, const char *name, int af) {
190	struct pvt *pvt = (struct pvt *)this->private;
191	int r;
192	char *tmp;
193
194	if (init(this) == -1)
195		return (NULL);
196
197	if (af != AF_INET) {
198		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
199		errno = EAFNOSUPPORT;
200		return (NULL);
201	}
202	nisfree(pvt, do_val);
203	DE_CONST(name, tmp);
204	r = yp_match(pvt->nis_domain, networks_byname, tmp,
205		     strlen(tmp), &pvt->curval_data, &pvt->curval_len);
206	if (r != 0) {
207		RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
208		return (NULL);
209	}
210	return (makenwent(this));
211}
212
213static void
214nw_rewind(struct irs_nw *this) {
215	struct pvt *pvt = (struct pvt *)this->private;
216
217	pvt->needrewind = 1;
218}
219
220static struct nwent *
221nw_next(struct irs_nw *this) {
222	struct pvt *pvt = (struct pvt *)this->private;
223	struct nwent *rval;
224	int r;
225
226	if (init(this) == -1)
227		return (NULL);
228
229	do {
230		if (pvt->needrewind) {
231			nisfree(pvt, do_all);
232			r = yp_first(pvt->nis_domain, networks_byaddr,
233				     &pvt->curkey_data, &pvt->curkey_len,
234				     &pvt->curval_data, &pvt->curval_len);
235			pvt->needrewind = 0;
236		} else {
237			char *newkey_data;
238			int newkey_len;
239
240			nisfree(pvt, do_val);
241			r = yp_next(pvt->nis_domain, networks_byaddr,
242				    pvt->curkey_data, pvt->curkey_len,
243				    &newkey_data, &newkey_len,
244				    &pvt->curval_data, &pvt->curval_len);
245			nisfree(pvt, do_key);
246			pvt->curkey_data = newkey_data;
247			pvt->curkey_len = newkey_len;
248		}
249		if (r != 0) {
250			RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
251			return (NULL);
252		}
253		rval = makenwent(this);
254	} while (rval == NULL);
255	return (rval);
256}
257
258static void
259nw_minimize(struct irs_nw *this) {
260	struct pvt *pvt = (struct pvt *)this->private;
261
262	if (pvt->res)
263		res_nclose(pvt->res);
264}
265
266static struct __res_state *
267nw_res_get(struct irs_nw *this) {
268	struct pvt *pvt = (struct pvt *)this->private;
269
270	if (!pvt->res) {
271		struct __res_state *res;
272		res = (struct __res_state *)malloc(sizeof *res);
273		if (!res) {
274			errno = ENOMEM;
275			return (NULL);
276		}
277		memset(res, 0, sizeof *res);
278		nw_res_set(this, res, free);
279	}
280
281	return (pvt->res);
282}
283
284static void
285nw_res_set(struct irs_nw *this, struct __res_state *res,
286		void (*free_res)(void *)) {
287	struct pvt *pvt = (struct pvt *)this->private;
288
289	if (pvt->res && pvt->free_res) {
290		res_nclose(pvt->res);
291		(*pvt->free_res)(pvt->res);
292	}
293
294	pvt->res = res;
295	pvt->free_res = free_res;
296}
297
298/* Private */
299
300static struct nwent *
301makenwent(struct irs_nw *this) {
302	struct pvt *pvt = (struct pvt *)this->private;
303	static const char spaces[] = " \t";
304	char *t, *cp, **ap;
305
306	if (pvt->nwbuf)
307		free(pvt->nwbuf);
308	pvt->nwbuf = pvt->curval_data;
309	pvt->curval_data = NULL;
310
311	if ((cp = strpbrk(pvt->nwbuf, "#\n")) != NULL)
312		*cp = '\0';
313	cp = pvt->nwbuf;
314
315	/* Name */
316	pvt->nwent.n_name = cp;
317	cp += strcspn(cp, spaces);
318	if (!*cp)
319		goto cleanup;
320	*cp++ = '\0';
321	cp += strspn(cp, spaces);
322
323	/* Network */
324	pvt->nwent.n_addrtype = AF_INET;
325	t = cp + strcspn(cp, spaces);
326	if (*t)
327		*t++ = '\0';
328	pvt->nwent.n_length = inet_net_pton(AF_INET, cp,
329					    pvt->addr, sizeof pvt->addr);
330	if (pvt->nwent.n_length < 0)
331		goto cleanup;
332	pvt->nwent.n_addr = pvt->addr;
333	cp = t;
334
335	/* Aliases */
336	ap = pvt->nwent.n_aliases = pvt->aliases;
337	while (*cp) {
338		if (ap >= &pvt->aliases[MAXALIASES])
339			break;
340		*ap++ = cp;
341		cp += strcspn(cp, spaces);
342		if (!*cp)
343			break;
344		*cp++ = '\0';
345		cp += strspn(cp, spaces);
346	}
347	*ap = NULL;
348
349	return (&pvt->nwent);
350
351 cleanup:
352	if (pvt->nwbuf) {
353		free(pvt->nwbuf);
354		pvt->nwbuf = NULL;
355	}
356	return (NULL);
357}
358
359static void
360nisfree(struct pvt *pvt, enum do_what do_what) {
361	if ((do_what & do_key) && pvt->curkey_data) {
362		free(pvt->curkey_data);
363		pvt->curkey_data = NULL;
364	}
365	if ((do_what & do_val) && pvt->curval_data) {
366		free(pvt->curval_data);
367		pvt->curval_data = NULL;
368	}
369}
370
371static int
372init(struct irs_nw *this) {
373	struct pvt *pvt = (struct pvt *)this->private;
374
375	if (!pvt->res && !nw_res_get(this))
376		return (-1);
377	if (((pvt->res->options & RES_INIT) == 0) &&
378	    res_ninit(pvt->res) == -1)
379		return (-1);
380	return (0);
381}
382
383#endif /*WANT_IRS_NIS*/
384
385/*! \file */
386