1 /* $NetBSD: getprotoent_r.c,v 1.8 2022/03/12 17:31:39 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
35 static char sccsid[] = "@(#)getprotoent.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: getprotoent_r.c,v 1.8 2022/03/12 17:31:39 christos Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include "namespace.h"
42 #include <netdb.h>
43 #include <stdio.h>
44 #include <errno.h>
45 #include <stdlib.h>
46 #include <string.h>
47
48 #include "protoent.h"
49
50 #ifdef __weak_alias
__weak_alias(endprotoent_r,_endprotoent_r)51 __weak_alias(endprotoent_r,_endprotoent_r)
52 __weak_alias(getprotoent_r,_getprotoent_r)
53 __weak_alias(setprotoent_r,_setprotoent_r)
54 #endif
55
56 void
57 setprotoent_r(int f, struct protoent_data *pd)
58 {
59 if (pd->fp == NULL)
60 pd->fp = fopen(_PATH_PROTOCOLS, "re");
61 else
62 rewind(pd->fp);
63 pd->stayopen |= f;
64 }
65
66 void
endprotoent_r(struct protoent_data * pd)67 endprotoent_r(struct protoent_data *pd)
68 {
69 if (pd->fp) {
70 (void)fclose(pd->fp);
71 pd->fp = NULL;
72 }
73 if (pd->aliases) {
74 free(pd->aliases);
75 pd->aliases = NULL;
76 pd->maxaliases = 0;
77 }
78 if (pd->line) {
79 free(pd->line);
80 pd->line = NULL;
81 }
82 pd->stayopen = 0;
83 }
84
85 struct protoent *
getprotoent_r(struct protoent * pr,struct protoent_data * pd)86 getprotoent_r(struct protoent *pr, struct protoent_data *pd)
87 {
88 char *p, *cp, **q;
89 size_t i = 0;
90 int serrno;
91
92 if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "re")) == NULL)
93 return NULL;
94
95 for (;;) {
96 if (pd->line)
97 free(pd->line);
98 pd->line = fparseln(pd->fp, NULL, NULL, NULL,
99 FPARSELN_UNESCALL);
100 if (pd->line == NULL)
101 return NULL;
102 pr->p_name = p = pd->line;
103 cp = strpbrk(p, " \t");
104 if (cp == NULL)
105 continue;
106 *cp++ = '\0';
107 while (*cp == ' ' || *cp == '\t')
108 cp++;
109 p = strpbrk(cp, " \t");
110 if (p != NULL)
111 *p++ = '\0';
112 pr->p_proto = atoi(cp);
113 if (pd->aliases == NULL) {
114 pd->aliases = NULL;
115 pd->maxaliases = 10;
116 errno = reallocarr(&pd->aliases,
117 pd->maxaliases, sizeof(*pd->aliases));
118 if (errno)
119 goto bad;
120 }
121 q = pr->p_aliases = pd->aliases;
122 if (p != NULL) {
123 cp = p;
124 while (cp && *cp) {
125 if (*cp == ' ' || *cp == '\t') {
126 cp++;
127 continue;
128 }
129 if (i == pd->maxaliases - 2) {
130 pd->maxaliases *= 2;
131 errno = reallocarr(&q,
132 pd->maxaliases, sizeof(*q));
133 if (errno)
134 goto bad;
135 pr->p_aliases = pd->aliases = q;
136 }
137 q[i++] = cp;
138
139 cp = strpbrk(cp, " \t");
140 if (cp != NULL)
141 *cp++ = '\0';
142 }
143 }
144 q[i] = NULL;
145 return pr;
146 }
147 bad:
148 serrno = errno;
149 endprotoent_r(pd);
150 errno = serrno;
151 return NULL;
152 }
153