1/*	$NetBSD: services_mkdb.c,v 1.14 2008/04/28 20:24:17 martin Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5 *
6 * Copyright (c) 1999 The NetBSD Foundation, Inc.
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to The NetBSD Foundation
10 * by Luke Mewburn and Christos Zoulas.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include <sys/param.h>
38#include <sys/stat.h>
39
40#include <assert.h>
41#include <db.h>
42#include <err.h>
43#include <fcntl.h>
44#include <netdb.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49#include <libgen.h>
50#include <ctype.h>
51#include <errno.h>
52#include <stringlist.h>
53
54#include "extern.h"
55
56static char tname[MAXPATHLEN];
57
58#define	PMASK		0xffff
59#define PROTOMAX	6
60
61static void	add(DB *, StringList *, size_t, const char *, size_t *, int);
62static StringList ***parseservices(const char *, StringList *);
63static void	cleanup(void);
64static void	store(DB *, DBT *, DBT *, int);
65static void	killproto(DBT *);
66static char    *getstring(const char *, size_t, char **, const char *);
67static size_t	getprotoindex(StringList *, const char *);
68static const char *getprotostr(StringList *, size_t);
69static const char *mkaliases(StringList *, char *, size_t);
70static void	usage(void);
71
72HASHINFO hinfo = {
73	.bsize = 256,
74	.ffactor = 4,
75	.nelem = 32768,
76	.cachesize = 1024,
77	.hash = NULL,
78	.lorder = 0
79};
80
81
82int
83main(int argc, char *argv[])
84{
85	DB	*db;
86	int	 ch;
87	const char *fname = _PATH_SERVICES;
88	const char *dbname = _PATH_SERVICES_DB;
89	int	 warndup = 1;
90	int	 unique = 0;
91	int	 otherflag = 0;
92	int	 byteorder = 0;
93	size_t	 cnt = 0;
94	StringList *sl, ***svc;
95	size_t port, proto;
96	char *dbname_dir, *dbname_dirbuf;
97	int dbname_dir_fd = -1;
98
99	setprogname(argv[0]);
100
101	while ((ch = getopt(argc, argv, "blo:qu")) != -1)
102		switch (ch) {
103		case 'b':
104		case 'l':
105			if (byteorder != 0)
106				usage();
107			byteorder = ch == 'b' ? 4321 : 1234;
108			break;
109		case 'q':
110			otherflag = 1;
111			warndup = 0;
112			break;
113		case 'o':
114			otherflag = 1;
115			dbname = optarg;
116			break;
117		case 'u':
118			unique++;
119			break;
120		case '?':
121		default:
122			usage();
123		}
124
125	argc -= optind;
126	argv += optind;
127
128	if (argc > 1 || (unique && otherflag))
129		usage();
130	if (argc == 1)
131		fname = argv[0];
132
133	/* Set byte order. */
134	hinfo.lorder = byteorder;
135
136	if (unique)
137		uniq(fname);
138
139	svc = parseservices(fname, sl = sl_init());
140
141	if (atexit(cleanup))
142		err(1, "Cannot install exit handler");
143
144	(void)snprintf(tname, sizeof(tname), "%s.tmp", dbname);
145	db = dbopen(tname, O_RDWR | O_CREAT | O_EXCL,
146	    (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH), DB_HASH, &hinfo);
147	if (!db)
148		err(1, "Error opening temporary database `%s'", tname);
149
150
151	for (port = 0; port < PMASK + 1; port++) {
152		if (svc[port] == NULL)
153			continue;
154
155		for (proto = 0; proto < PROTOMAX; proto++) {
156			StringList *s;
157			if ((s = svc[port][proto]) == NULL)
158				continue;
159			add(db, s, port, getprotostr(sl, proto), &cnt, warndup);
160		}
161
162		free(svc[port]);
163	}
164
165	free(svc);
166	sl_free(sl, 1);
167
168	if ((db->close)(db))
169		err(1, "Error closing temporary database `%s'", tname);
170
171	/*
172	 * Make sure file is safe on disk. To improve performance we will call
173	 * fsync() to the directory where file lies
174	 */
175	if (rename(tname, dbname) == -1 ||
176	    (dbname_dirbuf = strdup(dbname)) == NULL ||
177	    (dbname_dir = dirname(dbname_dirbuf)) == NULL ||
178	    (dbname_dir_fd = open(dbname_dir, O_RDONLY|O_DIRECTORY)) == -1 ||
179	    fsync(dbname_dir_fd) != 0) {
180		if (dbname_dir_fd != -1)
181			close(dbname_dir_fd);
182		err(1, "Cannot rename `%s' to `%s'", tname, dbname);
183	}
184
185	if (dbname_dir_fd != -1)
186		close(dbname_dir_fd);
187
188	return 0;
189}
190
191static void
192add(DB *db, StringList *sl, size_t port, const char *proto, size_t *cnt,
193    int warndup)
194{
195	size_t i;
196	char	 keyb[BUFSIZ], datab[BUFSIZ], abuf[BUFSIZ];
197	DBT	 data, key;
198	key.data = keyb;
199	data.data = datab;
200
201#ifdef DEBUG
202	(void)printf("add %s %zu %s [ ", sl->sl_str[0], port, proto);
203	for (i = 1; i < sl->sl_cur; i++)
204	    (void)printf("%s ", sl->sl_str[i]);
205	(void)printf("]\n");
206#endif
207
208	/* key `indirect key', data `full line' */
209	data.size = snprintf(datab, sizeof(datab), "%zu", (*cnt)++) + 1;
210	key.size = snprintf(keyb, sizeof(keyb), "%s %zu/%s %s",
211	    sl->sl_str[0], port, proto, mkaliases(sl, abuf, sizeof(abuf))) + 1;
212	store(db, &data, &key, warndup);
213
214	/* key `\377port/proto', data = `indirect key' */
215	key.size = snprintf(keyb, sizeof(keyb), "\377%zu/%s",
216	    port, proto) + 1;
217	store(db, &key, &data, warndup);
218
219	/* key `\377port', data = `indirect key' */
220	killproto(&key);
221	store(db, &key, &data, warndup);
222
223	/* add references for service and all aliases */
224	for (i = 0; i < sl->sl_cur; i++) {
225		/* key `\376service/proto', data = `indirect key' */
226		key.size = snprintf(keyb, sizeof(keyb), "\376%s/%s",
227		    sl->sl_str[i], proto) + 1;
228		store(db, &key, &data, warndup);
229
230		/* key `\376service', data = `indirect key' */
231		killproto(&key);
232		store(db, &key, &data, warndup);
233	}
234	sl_free(sl, 1);
235}
236
237static StringList ***
238parseservices(const char *fname, StringList *sl)
239{
240	ssize_t len;
241	size_t linecap, line, pindex;
242	FILE *fp;
243	StringList ***svc, *s;
244	char *p, *ep;
245
246	if ((fp = fopen(fname, "r")) == NULL)
247		err(1, "Cannot open `%s'", fname);
248
249	line = linecap = 0;
250	if ((svc = calloc(PMASK + 1, sizeof(StringList **))) == NULL)
251		err(1, "Cannot allocate %zu bytes", (size_t)(PMASK + 1));
252
253	p = NULL;
254	while ((len = getline(&p, &linecap, fp)) != -1) {
255		char	*name, *port, *proto, *aliases, *cp, *alias;
256		unsigned long pnum;
257
258		line++;
259
260		if (len == 0)
261			continue;
262
263		if (p[len - 1] == '\n')
264			p[len - 1] = '\0';
265
266		for (cp = p; *cp && isspace((unsigned char)*cp); cp++)
267			continue;
268
269		if (*cp == '\0' || *cp == '#')
270			continue;
271
272		if ((name = getstring(fname, line, &cp, "name")) == NULL)
273			continue;
274
275		if ((port = getstring(fname, line, &cp, "port")) == NULL)
276			continue;
277
278		if (cp) {
279			for (aliases = cp; *cp && *cp != '#'; cp++)
280				continue;
281
282			if (*cp)
283				*cp = '\0';
284		} else
285			aliases = NULL;
286
287		proto = strchr(port, '/');
288		if (proto == NULL || proto[1] == '\0') {
289			warnx("%s, %zu: no protocol found", fname, line);
290			continue;
291		}
292		*proto++ = '\0';
293
294		errno = 0;
295		pnum = strtoul(port, &ep, 0);
296		if (*port == '\0' || *ep != '\0') {
297			warnx("%s, %zu: invalid port `%s'", fname, line, port);
298			continue;
299		}
300		if ((errno == ERANGE && pnum == ULONG_MAX) || pnum > PMASK) {
301			warnx("%s, %zu: port too big `%s'", fname, line, port);
302			continue;
303		}
304
305		if (svc[pnum] == NULL) {
306			svc[pnum] = calloc(PROTOMAX, sizeof(StringList *));
307			if (svc[pnum] == NULL)
308				err(1, "Cannot allocate %zu bytes",
309				    (size_t)PROTOMAX);
310		}
311
312		pindex = getprotoindex(sl, proto);
313		if (svc[pnum][pindex] == NULL)
314			s = svc[pnum][pindex] = sl_init();
315		else
316			s = svc[pnum][pindex];
317
318		/* build list of aliases */
319		if (sl_find(s, name) == NULL) {
320			char *p2;
321
322			if ((p2 = strdup(name)) == NULL)
323				err(1, "Cannot copy string");
324			(void)sl_add(s, p2);
325		}
326
327		if (aliases) {
328			while ((alias = strsep(&aliases, " \t")) != NULL) {
329				if (alias[0] == '\0')
330					continue;
331				if (sl_find(s, alias) == NULL) {
332					char *p2;
333
334					if ((p2 = strdup(alias)) == NULL)
335						err(1, "Cannot copy string");
336					(void)sl_add(s, p2);
337				}
338			}
339		}
340	}
341	(void)fclose(fp);
342	return svc;
343}
344
345/*
346 * cleanup(): Remove temporary files upon exit
347 */
348static void
349cleanup(void)
350{
351	if (tname[0])
352		(void)unlink(tname);
353}
354
355static char *
356getstring(const char *fname, size_t line, char **cp, const char *tag)
357{
358	char *str;
359
360	while ((str = strsep(cp, " \t")) != NULL && *str == '\0')
361		continue;
362
363	if (str == NULL)
364		warnx("%s, %zu: no %s found", fname, line, tag);
365
366	return str;
367}
368
369static void
370killproto(DBT *key)
371{
372	char *p, *d = key->data;
373
374	if ((p = strchr(d, '/')) == NULL)
375		abort();
376	*p++ = '\0';
377	key->size = p - d;
378}
379
380static void
381store(DB *db, DBT *key, DBT *data, int warndup)
382{
383#ifdef DEBUG
384	int k = key->size - 1;
385	int d = data->size - 1;
386	(void)printf("store [%*.*s] [%*.*s]\n",
387		k, k, (char *)key->data + 1,
388		d, d, (char *)data->data + 1);
389#endif
390	switch ((db->put)(db, key, data, R_NOOVERWRITE)) {
391	case 0:
392		break;
393	case 1:
394		if (warndup)
395			warnx("duplicate service `%s'",
396			    &((char *)key->data)[1]);
397		break;
398	case -1:
399		err(1, "put");
400		break;
401	default:
402		abort();
403		break;
404	}
405}
406
407static size_t
408getprotoindex(StringList *sl, const char *str)
409{
410	size_t i;
411	char *p;
412
413	for (i= 0; i < sl->sl_cur; i++)
414		if (strcmp(sl->sl_str[i], str) == 0)
415			return i;
416
417	if (i == PROTOMAX)
418		errx(1, "Ran out of protocols adding `%s';"
419		    " recompile with larger PROTOMAX", str);
420	if ((p = strdup(str)) == NULL)
421		err(1, "Cannot copy string");
422	(void)sl_add(sl, p);
423	return i;
424}
425
426static const char *
427getprotostr(StringList *sl, size_t i)
428{
429	assert(i < sl->sl_cur);
430	return sl->sl_str[i];
431}
432
433static const char *
434mkaliases(StringList *sl, char *buf, size_t len)
435{
436	size_t nc, i, pos;
437
438	buf[0] = 0;
439	for (i = 1, pos = 0; i < sl->sl_cur; i++) {
440		nc = strlcpy(buf + pos, sl->sl_str[i], len);
441		if (nc >= len)
442			goto out;
443		pos += nc;
444		len -= nc;
445		nc = strlcpy(buf + pos, " ", len);
446		if (nc >= len)
447			goto out;
448		pos += nc;
449		len -= nc;
450	}
451	return buf;
452out:
453	warn("aliases for `%s' truncated", sl->sl_str[0]);
454	return buf;
455}
456
457static void
458usage(void)
459{
460	(void)fprintf(stderr,
461	    "Usage:\t%s [-b | -l] [-q] [-o <db>] [<servicefile>]\n"
462	    "\t%s -u [<servicefile>]\n", getprogname(), getprogname());
463	exit(1);
464}
465