1/*	$NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 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[] = "@(#)getprotoent.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include <netdb.h>
42#include <stdio.h>
43#include <errno.h>
44#include <stdlib.h>
45#include <string.h>
46
47#include <FindDirectory.h>
48
49#include <libutil.h>
50#include "protoent.h"
51
52#ifdef __weak_alias
53__weak_alias(endprotoent_r,_endprotoent_r)
54__weak_alias(getprotoent_r,_getprotoent_r)
55__weak_alias(setprotoent_r,_setprotoent_r)
56#endif
57
58void
59setprotoent_r(int f, struct protoent_data *pd)
60{
61	if (pd->fp == NULL) {
62		char buffer[256];
63		find_directory(B_SYSTEM_DATA_DIRECTORY, 0, false, buffer, sizeof(buffer));
64		strlcat(buffer, "/network/protocols", sizeof(buffer));
65
66		pd->fp = fopen(buffer, "re");
67	} else
68		rewind(pd->fp);
69	pd->stayopen |= f;
70}
71
72void
73endprotoent_r(struct protoent_data *pd)
74{
75	if (pd->fp) {
76		(void)fclose(pd->fp);
77		pd->fp = NULL;
78	}
79	if (pd->aliases) {
80		free(pd->aliases);
81		pd->aliases = NULL;
82		pd->maxaliases = 0;
83	}
84	if (pd->line) {
85		free(pd->line);
86		pd->line = NULL;
87	}
88	pd->stayopen = 0;
89}
90
91struct protoent *
92getprotoent_r(struct protoent *pr, struct protoent_data *pd)
93{
94	char *p, *cp, **q;
95	size_t i = 0;
96	int oerrno;
97
98	if (pd->fp == NULL)
99		setprotoent_r(0, pd);
100	if (pd->fp == NULL)
101		return NULL;
102
103	for (;;) {
104		if (pd->line)
105			free(pd->line);
106		pd->line = fparseln(pd->fp, NULL, NULL, NULL,
107		    FPARSELN_UNESCALL);
108		if (pd->line == NULL)
109			return NULL;
110		pr->p_name = p = pd->line;
111		cp = strpbrk(p, " \t");
112		if (cp == NULL)
113			continue;
114		*cp++ = '\0';
115		while (*cp == ' ' || *cp == '\t')
116			cp++;
117		p = strpbrk(cp, " \t");
118		if (p != NULL)
119			*p++ = '\0';
120		pr->p_proto = atoi(cp);
121		if (pd->aliases == NULL) {
122			pd->maxaliases = 10;
123			pd->aliases = malloc(pd->maxaliases * sizeof(char *));
124			if (pd->aliases == NULL) {
125				oerrno = errno;
126				endprotoent_r(pd);
127				errno = oerrno;
128				return NULL;
129			}
130		}
131		q = pr->p_aliases = pd->aliases;
132		if (p != NULL) {
133			cp = p;
134			while (cp && *cp) {
135				if (*cp == ' ' || *cp == '\t') {
136					cp++;
137					continue;
138				}
139				if (i == pd->maxaliases - 2) {
140					pd->maxaliases *= 2;
141					q = realloc(q,
142					    pd->maxaliases * sizeof(char *));
143					if (q == NULL) {
144						oerrno = errno;
145						endprotoent_r(pd);
146						errno = oerrno;
147						return NULL;
148					}
149					pr->p_aliases = pd->aliases = q;
150				}
151				q[i++] = cp;
152
153				cp = strpbrk(cp, " \t");
154				if (cp != NULL)
155					*cp++ = '\0';
156			}
157		}
158		q[i] = NULL;
159		return pr;
160	}
161}
162