1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * 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 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #include <sys/cdefs.h>
29 #include <sys/types.h>
30 #include <endian.h>
31 #include <netdb.h>
32 #include "servent.h"
33 #include "services.h"
34
35 void
setservent(int f)36 setservent(int f)
37 {
38 res_static rs = __res_get_static();
39 if (rs) {
40 rs->servent_ptr = NULL;
41 }
42 }
43
44 void
endservent(void)45 endservent(void)
46 {
47 /* nothing to do */
48 }
49
50 struct servent *
getservent_r(res_static rs)51 getservent_r( res_static rs )
52 {
53 const char* p;
54 const char* q;
55 int namelen;
56 int nn,count;
57 int total = 0;
58 int port;
59 char* p2;
60
61 p = rs->servent_ptr;
62 if (p == NULL)
63 p = _services;
64 else if (p[0] == 0)
65 return NULL;
66
67 /* first compute the total size */
68 namelen = p[0];
69 total += namelen + 1;
70 q = p + 1 + namelen + 3; /* skip name + port + proto */
71 count = q[0]; /* get aliascount */
72 q += 1;
73
74 total += (count+1)*sizeof(char*);
75 for (nn = 0; nn < count; nn++) {
76 int len2 = q[0];
77 total += 1 + len2;
78 q += 1 + len2;
79 }
80
81 /* reallocate the thread-specific servent struct */
82 p2 = realloc( (char*)rs->servent.s_aliases, total );
83 if (p2 == NULL)
84 return NULL;
85
86 /* now write to it */
87 rs->servent.s_aliases = (char**) p2;
88 p2 += (count+1)*sizeof(char*);
89 rs->servent.s_name = p2;
90 p2 += namelen + 1;
91 rs->servent.s_proto = p2;
92
93 /* copy name + port + setup protocol */
94 memcpy( rs->servent.s_name, p+1, namelen );
95 rs->servent.s_name[namelen] = 0;
96 p += 1 + namelen;
97
98 /* s_port must be in network byte order */
99 port = ((((unsigned char*)p)[0] << 8) |
100 ((unsigned char*)p)[1]);
101
102 rs->servent.s_port = htons(port);
103 rs->servent.s_proto = p[2] == 't' ? "tcp" : "udp";
104 p += 4; /* skip port(2) + proto(1) + aliascount(1) */
105
106 for (nn = 0; nn < count; nn++) {
107 int len2 = p[0];
108 rs->servent.s_aliases[nn] = p2;
109 memcpy( p2, p+1, len2 );
110 p2[len2] = 0;
111 p2 += len2 + 1;
112 p += len2 + 1;
113 }
114 rs->servent.s_aliases[nn] = NULL;
115
116 rs->servent_ptr = p;
117
118 return &rs->servent;
119 }
120
121 struct servent *
getservent(void)122 getservent(void)
123 {
124 res_static rs = __res_get_static();
125
126 if (rs == NULL) return NULL;
127
128 return getservent_r(rs);
129 }
130