services_mkdb.c revision 302408 
1/*	$NetBSD: services_mkdb.c,v 1.14 2008/04/28 20:24:17 martin Exp $	*/
2
3/*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Luke Mewburn and Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/11/usr.sbin/services_mkdb/services_mkdb.c 300952 2016-05-29 10:41:27Z ed $");
34
35#include <sys/param.h>
36#include <sys/stat.h>
37
38#include <assert.h>
39#include <db.h>
40#include <err.h>
41#include <fcntl.h>
42#include <netdb.h>
43#define _WITH_GETLINE
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48#include <libgen.h>
49#include <ctype.h>
50#include <errno.h>
51#include <stringlist.h>
52
53#include "extern.h"
54
55static char tname[MAXPATHLEN];
56
57#define	PMASK		0xffff
58#define PROTOMAX	5
59
60static void	add(DB *, StringList *, size_t, const char *, size_t *, int);
61static StringList ***parseservices(const char *, StringList *);
62static void	cleanup(void);
63static void	store(DB *, DBT *, DBT *, int);
64static void	killproto(DBT *);
65static char    *getstring(const char *, size_t, char **, const char *);
66static size_t	getprotoindex(StringList *, const char *);
67static const char *getprotostr(StringList *, size_t);
68static const char *mkaliases(StringList *, char *, size_t);
69static void	usage(void);
70
71HASHINFO hinfo = {
72	.bsize = 256,
73	.ffactor = 4,
74	.nelem = 32768,
75	.cachesize = 1024,
76	.hash = NULL,
77	.lorder = 0
78};
79
80
81int
82main(int argc, char *argv[])
83{
84	DB	*db;
85	int	 ch;
86	const char *fname = _PATH_SERVICES;
87	const char *dbname = _PATH_SERVICES_DB;
88	int	 warndup = 1;
89	int	 unique = 0;
90	int	 otherflag = 0;
91	int	 byteorder = 0;
92	size_t	 cnt = 0;
93	StringList *sl, ***svc;
94	size_t port, proto;
95	char *dbname_dir, *dbname_dirbuf;
96	int dbname_dir_fd = -1;
97
98	setprogname(argv[0]);
99
100	while ((ch = getopt(argc, argv, "blo:qu")) != -1)
101		switch (ch) {
102		case 'b':
103		case 'l':
104			if (byteorder != 0)
105				usage();
106			byteorder = ch == 'b' ? 4321 : 1234;
107			break;
108		case 'q':
109			otherflag = 1;
110			warndup = 0;
111			break;
112		case 'o':
113			otherflag = 1;
114			dbname = optarg;
115			break;
116		case 'u':
117			unique++;
118			break;
119		case '?':
120		default:
121			usage();
122		}
123
124	argc -= optind;
125	argv += optind;
126
127	if (argc > 1 || (unique && otherflag))
128		usage();
129	if (argc == 1)
130		fname = argv[0];
131
132	/* Set byte order. */
133	hinfo.lorder = byteorder;
134
135	if (unique)
136		uniq(fname);
137
138	svc = parseservices(fname, sl = sl_init());
139
140	if (atexit(cleanup))
141		err(1, "Cannot install exit handler");
142
143	(void)snprintf(tname, sizeof(tname), "%s.tmp", dbname);
144	db = dbopen(tname, O_RDWR | O_CREAT | O_EXCL,
145	    (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH), DB_HASH, &hinfo);
146	if (!db)
147		err(1, "Error opening temporary database `%s'", tname);
148
149
150	for (port = 0; port < PMASK + 1; port++) {
151		if (svc[port] == NULL)
152			continue;
153
154		for (proto = 0; proto < PROTOMAX; proto++) {
155			StringList *s;
156			if ((s = svc[port][proto]) == NULL)
157				continue;
158			add(db, s, port, getprotostr(sl, proto), &cnt, warndup);
159		}
160
161		free(svc[port]);
162	}
163
164	free(svc);
165	sl_free(sl, 1);
166
167	if ((db->close)(db))
168		err(1, "Error closing temporary database `%s'", tname);
169
170	/*
171	 * Make sure file is safe on disk. To improve performance we will call
172	 * fsync() to the directory where file lies
173	 */
174	if (rename(tname, dbname) == -1 ||
175	    (dbname_dirbuf = strdup(dbname)) == NULL ||
176	    (dbname_dir = dirname(dbname_dirbuf)) == NULL ||
177	    (dbname_dir_fd = open(dbname_dir, O_RDONLY|O_DIRECTORY)) == -1 ||
178	    fsync(dbname_dir_fd) != 0) {
179		if (dbname_dir_fd != -1)
180			close(dbname_dir_fd);
181		err(1, "Cannot rename `%s' to `%s'", tname, dbname);
182	}
183
184	if (dbname_dir_fd != -1)
185		close(dbname_dir_fd);
186
187	return 0;
188}
189
190static void
191add(DB *db, StringList *sl, size_t port, const char *proto, size_t *cnt,
192    int warndup)
193{
194	size_t i;
195	char	 keyb[BUFSIZ], datab[BUFSIZ], abuf[BUFSIZ];
196	DBT	 data, key;
197	key.data = keyb;
198	data.data = datab;
199
200#ifdef DEBUG
201	(void)printf("add %s %zu %s [ ", sl->sl_str[0], port, proto);
202	for (i = 1; i < sl->sl_cur; i++)
203	    (void)printf("%s ", sl->sl_str[i]);
204	(void)printf("]\n");
205#endif
206
207	/* key `indirect key', data `full line' */
208	data.size = snprintf(datab, sizeof(datab), "%zu", (*cnt)++) + 1;
209	key.size = snprintf(keyb, sizeof(keyb), "%s %zu/%s %s",
210	    sl->sl_str[0], port, proto, mkaliases(sl, abuf, sizeof(abuf))) + 1;
211	store(db, &data, &key, warndup);
212
213	/* key `\377port/proto', data = `indirect key' */
214	key.size = snprintf(keyb, sizeof(keyb), "\377%zu/%s",
215	    port, proto) + 1;
216	store(db, &key, &data, warndup);
217
218	/* key `\377port', data = `indirect key' */
219	killproto(&key);
220	store(db, &key, &data, warndup);
221
222	/* add references for service and all aliases */
223	for (i = 0; i < sl->sl_cur; i++) {
224		/* key `\376service/proto', data = `indirect key' */
225		key.size = snprintf(keyb, sizeof(keyb), "\376%s/%s",
226		    sl->sl_str[i], proto) + 1;
227		store(db, &key, &data, warndup);
228
229		/* key `\376service', data = `indirect key' */
230		killproto(&key);
231		store(db, &key, &data, warndup);
232	}
233	sl_free(sl, 1);
234}
235
236static StringList ***
237parseservices(const char *fname, StringList *sl)
238{
239	ssize_t len;
240	size_t linecap, line, pindex;
241	FILE *fp;
242	StringList ***svc, *s;
243	char *p, *ep;
244
245	if ((fp = fopen(fname, "r")) == NULL)
246		err(1, "Cannot open `%s'", fname);
247
248	line = linecap = 0;
249	if ((svc = calloc(PMASK + 1, sizeof(StringList **))) == NULL)
250		err(1, "Cannot allocate %zu bytes", (size_t)(PMASK + 1));
251
252	p = NULL;
253	while ((len = getline(&p, &linecap, fp)) != -1) {
254		char	*name, *port, *proto, *aliases, *cp, *alias;
255		unsigned long pnum;
256
257		line++;
258
259		if (len == 0)
260			continue;
261
262		if (p[len - 1] == '\n')
263			p[len - 1] = '\0';
264
265		for (cp = p; *cp && isspace((unsigned char)*cp); cp++)
266			continue;
267
268		if (*cp == '\0' || *cp == '#')
269			continue;
270
271		if ((name = getstring(fname, line, &cp, "name")) == NULL)
272			continue;
273
274		if ((port = getstring(fname, line, &cp, "port")) == NULL)
275			continue;
276
277		if (cp) {
278			for (aliases = cp; *cp && *cp != '#'; cp++)
279				continue;
280
281			if (*cp)
282				*cp = '\0';
283		} else
284			aliases = NULL;
285
286		proto = strchr(port, '/');
287		if (proto == NULL || proto[1] == '\0') {
288			warnx("%s, %zu: no protocol found", fname, line);
289			continue;
290		}
291		*proto++ = '\0';
292
293		errno = 0;
294		pnum = strtoul(port, &ep, 0);
295		if (*port == '\0' || *ep != '\0') {
296			warnx("%s, %zu: invalid port `%s'", fname, line, port);
297			continue;
298		}
299		if ((errno == ERANGE && pnum == ULONG_MAX) || pnum > PMASK) {
300			warnx("%s, %zu: port too big `%s'", fname, line, port);
301			continue;
302		}
303
304		if (svc[pnum] == NULL) {
305			svc[pnum] = calloc(PROTOMAX, sizeof(StringList *));
306			if (svc[pnum] == NULL)
307				err(1, "Cannot allocate %zu bytes",
308				    (size_t)PROTOMAX);
309		}
310
311		pindex = getprotoindex(sl, proto);
312		if (svc[pnum][pindex] == NULL)
313			s = svc[pnum][pindex] = sl_init();
314		else
315			s = svc[pnum][pindex];
316
317		/* build list of aliases */
318		if (sl_find(s, name) == NULL) {
319			char *p2;
320
321			if ((p2 = strdup(name)) == NULL)
322				err(1, "Cannot copy string");
323			(void)sl_add(s, p2);
324		}
325
326		if (aliases) {
327			while ((alias = strsep(&aliases, " \t")) != NULL) {
328				if (alias[0] == '\0')
329					continue;
330				if (sl_find(s, alias) == NULL) {
331					char *p2;
332
333					if ((p2 = strdup(alias)) == NULL)
334						err(1, "Cannot copy string");
335					(void)sl_add(s, p2);
336				}
337			}
338		}
339	}
340	(void)fclose(fp);
341	return svc;
342}
343
344/*
345 * cleanup(): Remove temporary files upon exit
346 */
347static void
348cleanup(void)
349{
350	if (tname[0])
351		(void)unlink(tname);
352}
353
354static char *
355getstring(const char *fname, size_t line, char **cp, const char *tag)
356{
357	char *str;
358
359	while ((str = strsep(cp, " \t")) != NULL && *str == '\0')
360		continue;
361
362	if (str == NULL)
363		warnx("%s, %zu: no %s found", fname, line, tag);
364
365	return str;
366}
367
368static void
369killproto(DBT *key)
370{
371	char *p, *d = key->data;
372
373	if ((p = strchr(d, '/')) == NULL)
374		abort();
375	*p++ = '\0';
376	key->size = p - d;
377}
378
379static void
380store(DB *db, DBT *key, DBT *data, int warndup)
381{
382#ifdef DEBUG
383	int k = key->size - 1;
384	int d = data->size - 1;
385	(void)printf("store [%*.*s] [%*.*s]\n",
386		k, k, (char *)key->data + 1,
387		d, d, (char *)data->data + 1);
388#endif
389	switch ((db->put)(db, key, data, R_NOOVERWRITE)) {
390	case 0:
391		break;
392	case 1:
393		if (warndup)
394			warnx("duplicate service `%s'",
395			    &((char *)key->data)[1]);
396		break;
397	case -1:
398		err(1, "put");
399		break;
400	default:
401		abort();
402		break;
403	}
404}
405
406static size_t
407getprotoindex(StringList *sl, const char *str)
408{
409	size_t i;
410	char *p;
411
412	for (i= 0; i < sl->sl_cur; i++)
413		if (strcmp(sl->sl_str[i], str) == 0)
414			return i;
415
416	if (i == PROTOMAX)
417		errx(1, "Ran out of protocols adding `%s';"
418		    " recompile with larger PROTOMAX", str);
419	if ((p = strdup(str)) == NULL)
420		err(1, "Cannot copy string");
421	(void)sl_add(sl, p);
422	return i;
423}
424
425static const char *
426getprotostr(StringList *sl, size_t i)
427{
428	assert(i < sl->sl_cur);
429	return sl->sl_str[i];
430}
431
432static const char *
433mkaliases(StringList *sl, char *buf, size_t len)
434{
435	size_t nc, i, pos;
436
437	buf[0] = 0;
438	for (i = 1, pos = 0; i < sl->sl_cur; i++) {
439		nc = strlcpy(buf + pos, sl->sl_str[i], len);
440		if (nc >= len)
441			goto out;
442		pos += nc;
443		len -= nc;
444		nc = strlcpy(buf + pos, " ", len);
445		if (nc >= len)
446			goto out;
447		pos += nc;
448		len -= nc;
449	}
450	return buf;
451out:
452	warn("aliases for `%s' truncated", sl->sl_str[0]);
453	return buf;
454}
455
456static void
457usage(void)
458{
459	(void)fprintf(stderr,
460	    "Usage:\t%s [-b | -l] [-q] [-o <db>] [<servicefile>]\n"
461	    "\t%s -u [<servicefile>]\n", getprogname(), getprogname());
462	exit(1);
463}
464