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
35 static 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
__weak_alias(getservbyname_r,_getservbyname_r)49 __weak_alias(getservbyname_r,_getservbyname_r)
50 #endif
51
52 static 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;
130 gotname:
131 if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
132 return sp;
133 }
134 return NULL;
135 }
136 }
137
138 struct servent *
getservbyname_r(const char * name,const char * proto,struct servent * sp,struct servent_data * sd)139 getservbyname_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