getprotoent.c revision 145626 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)getprotoent.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/net/getprotoent.c 145626 2005-04-28 15:32:55Z ume $");
39
40#include <sys/types.h>
41#include <sys/socket.h>
42#include <netdb.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include "namespace.h"
47#include "reentrant.h"
48#include "un-namespace.h"
49#include "netdb_private.h"
50
51static struct protodata protodata;
52static thread_key_t protodata_key;
53static once_t protodata_init_once = ONCE_INITIALIZER;
54static int protodata_thr_keycreated = 0;
55
56static void
57protoent_data_clear(struct protoent_data *ped)
58{
59	if (ped->fp) {
60		fclose(ped->fp);
61		ped->fp = NULL;
62	}
63}
64
65static void
66protodata_free(void *ptr)
67{
68	struct protodata *pd = ptr;
69
70	if (pd == NULL)
71		return;
72	protoent_data_clear(&pd->data);
73	free(pd);
74}
75
76static void
77protodata_keycreate(void)
78{
79	protodata_thr_keycreated =
80	    (thr_keycreate(&protodata_key, protodata_free) == 0);
81}
82
83struct protodata *
84__protodata_init(void)
85{
86	struct protodata *pd;
87
88	if (thr_main() != 0)
89		return (&protodata);
90	if (thr_once(&protodata_init_once, protodata_keycreate) != 0 ||
91	    !protodata_thr_keycreated)
92		return (NULL);
93	if ((pd = thr_getspecific(protodata_key)) != NULL)
94		return (pd);
95	if ((pd = calloc(1, sizeof(*pd))) == NULL)
96		return (NULL);
97	if (thr_setspecific(protodata_key, pd) == 0)
98		return (pd);
99	free(pd);
100	return (NULL);
101}
102
103void
104setprotoent_r(int f, struct protoent_data *ped)
105{
106	if (ped->fp == NULL)
107		ped->fp = fopen(_PATH_PROTOCOLS, "r");
108	else
109		rewind(ped->fp);
110	ped->stayopen |= f;
111}
112
113void
114endprotoent_r(struct protoent_data *ped)
115{
116	if (ped->fp) {
117		fclose(ped->fp);
118		ped->fp = NULL;
119	}
120	ped->stayopen = 0;
121}
122
123int
124getprotoent_r(struct protoent *pe, struct protoent_data *ped)
125{
126	char *p;
127	char *cp, **q, *endp;
128	long l;
129
130	if (ped->fp == NULL && (ped->fp = fopen(_PATH_PROTOCOLS, "r")) == NULL)
131		return (-1);
132again:
133	if ((p = fgets(ped->line, sizeof ped->line, ped->fp)) == NULL)
134		return (-1);
135	if (*p == '#')
136		goto again;
137	cp = strpbrk(p, "#\n");
138	if (cp != NULL)
139		*cp = '\0';
140	pe->p_name = p;
141	cp = strpbrk(p, " \t");
142	if (cp == NULL)
143		goto again;
144	*cp++ = '\0';
145	while (*cp == ' ' || *cp == '\t')
146		cp++;
147	p = strpbrk(cp, " \t");
148	if (p != NULL)
149		*p++ = '\0';
150	l = strtol(cp, &endp, 10);
151	if (endp == cp || *endp != '\0' || l < 0 || l > USHRT_MAX)
152		goto again;
153	pe->p_proto = l;
154	q = pe->p_aliases = ped->aliases;
155	if (p != NULL) {
156		cp = p;
157		while (cp && *cp) {
158			if (*cp == ' ' || *cp == '\t') {
159				cp++;
160				continue;
161			}
162			if (q < &ped->aliases[_MAXALIASES - 1])
163				*q++ = cp;
164			cp = strpbrk(cp, " \t");
165			if (cp != NULL)
166				*cp++ = '\0';
167		}
168	}
169	*q = NULL;
170	return (0);
171}
172
173void
174setprotoent(int f)
175{
176	struct protodata *pd;
177
178	if ((pd = __protodata_init()) == NULL)
179		return;
180	setprotoent_r(f, &pd->data);
181}
182
183void
184endprotoent(void)
185{
186	struct protodata *pd;
187
188	if ((pd = __protodata_init()) == NULL)
189		return;
190	endprotoent_r(&pd->data);
191}
192
193struct protoent *
194getprotoent(void)
195{
196	struct protodata *pd;
197
198	if ((pd = __protodata_init()) == NULL)
199		return (NULL);
200	if (getprotoent_r(&pd->proto, &pd->data) != 0)
201		return (NULL);
202	return (&pd->proto);
203}
204