1/*	$NetBSD: getservbyname_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)getservbyname.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: getservbyname_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include <assert.h>
42#include <netdb.h>
43#include <stdlib.h>
44#include <string.h>
45
46#include "servent.h"
47
48#ifdef __weak_alias
49__weak_alias(getservbyname_r,_getservbyname_r)
50#endif
51
52static struct servent *
53_servent_getbyname(struct servent_data *sd, struct servent *sp,
54    const char *name, const char *proto)
55{
56
57	if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0)
58		return NULL;
59
60#if 0
61	if (sd->flags & _SV_CDB) {
62		uint8_t buf[255 * 2 + 2];
63		size_t namelen, protolen;
64		const uint8_t *data, *data_end;
65		const void *data_ptr;
66		size_t datalen;
67
68		namelen = strlen(name);
69		if (namelen == 0 || namelen > 255)
70			return NULL;
71		if (proto != NULL) {
72			protolen = strlen(proto);
73			if (protolen == 0 || protolen > 255)
74				return NULL;
75		} else
76			protolen = 0;
77		if (namelen + protolen > 255)
78			return NULL;
79
80		buf[0] = (uint8_t)namelen;
81		buf[1] = (uint8_t)protolen;
82		memcpy(buf + 2, name, namelen);
83		memcpy(buf + 2 + namelen, proto, protolen);
84
85		if (cdbr_find(sd->cdb, buf, 2 + namelen + protolen,
86		    &data_ptr, &datalen))
87			return NULL;
88
89		if (datalen < namelen + protolen + 6)
90			return NULL;
91
92		data = data_ptr;
93		data_end = data + datalen;
94		if (protolen) {
95			if (data[2] != protolen)
96				return NULL;
97			if (memcmp(data + 3, proto, protolen + 1))
98				return NULL;
99		}
100		data += 3 + data[2] + 1;
101		if (data > data_end)
102			return NULL;
103		while (data != data_end) {
104			if (*data == '\0')
105				return NULL;
106			if (data + data[0] + 2 > data_end)
107				return NULL;
108			if (data[0] == namelen &&
109			    memcmp(data + 1, name, namelen + 1) == 0)
110				return _servent_parsedb(sd, sp, data_ptr,
111				    datalen);
112			data += data[0] + 2;
113		}
114		return NULL;
115	} else
116#endif
117	{
118		while (_servent_getline(sd) != -1) {
119			char **cp;
120			if (_servent_parseline(sd, sp) == NULL)
121				continue;
122
123			if (strcmp(name, sp->s_name) == 0)
124				goto gotname;
125
126			for (cp = sp->s_aliases; *cp; cp++)
127				if (strcmp(name, *cp) == 0)
128					goto gotname;
129			continue;
130gotname:
131			if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
132				return sp;
133		}
134		return NULL;
135	}
136}
137
138struct servent *
139getservbyname_r(const char *name, const char *proto, struct servent *sp,
140    struct servent_data *sd)
141{
142	assert(name != NULL);
143	/* proto may be NULL */
144
145	setservent_r(sd->flags & _SV_STAYOPEN, sd);
146	sp = _servent_getbyname(sd, sp, name, proto);
147	if (!(sd->flags & _SV_STAYOPEN))
148		_servent_close(sd);
149	return sp;
150}
151