1 | /* Convert a DNS domain name from presentation to wire format. |
2 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
3 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
4 | * |
5 | * Permission to use, copy, modify, and distribute this software for any |
6 | * purpose with or without fee is hereby granted, provided that the above |
7 | * copyright notice and this permission notice appear in all copies. |
8 | * |
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
15 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
16 | */ |
17 | |
18 | #include <arpa/nameser.h> |
19 | #include <errno.h> |
20 | #include <shlib-compat.h> |
21 | |
22 | /* Converts an ASCII string into an encoded domain name as per |
23 | RFC1035. Returns -1 if it fails, 1 if string was fully qualified, |
24 | 0 is string was not fully qualified. Enforces label and domain |
25 | length limits. */ |
26 | int |
27 | ___ns_name_pton (const char *src, unsigned char *dst, size_t dstsiz) |
28 | { |
29 | unsigned char *label, *bp, *eom; |
30 | int c, n, escaped; |
31 | |
32 | escaped = 0; |
33 | bp = dst; |
34 | eom = dst + dstsiz; |
35 | label = bp++; |
36 | |
37 | while ((c = *src++) != 0) |
38 | { |
39 | if (escaped) |
40 | { |
41 | if ('0' <= c && c <= '9') |
42 | { |
43 | n = (c - '0') * 100; |
44 | if ((c = *src++) == 0 || c < '0' || c > '9') |
45 | { |
46 | __set_errno (EMSGSIZE); |
47 | return -1; |
48 | } |
49 | n += (c - '0') * 10; |
50 | if ((c = *src++) == 0 || c < '0' || c > '9') |
51 | { |
52 | __set_errno (EMSGSIZE); |
53 | return -1; |
54 | } |
55 | n += c - '0'; |
56 | if (n > 255) |
57 | { |
58 | __set_errno (EMSGSIZE); |
59 | return -1; |
60 | } |
61 | c = n; |
62 | } |
63 | escaped = 0; |
64 | } |
65 | else if (c == '\\') |
66 | { |
67 | escaped = 1; |
68 | continue; |
69 | } |
70 | else if (c == '.') |
71 | { |
72 | c = (bp - label - 1); |
73 | if ((c & NS_CMPRSFLGS) != 0) /* Label too big. */ |
74 | { |
75 | __set_errno (EMSGSIZE); |
76 | return -1; |
77 | } |
78 | if (label >= eom) |
79 | { |
80 | __set_errno (EMSGSIZE); |
81 | return -1; |
82 | } |
83 | *label = c; |
84 | /* Fully qualified ? */ |
85 | if (*src == '\0') |
86 | { |
87 | if (c != 0) |
88 | { |
89 | if (bp >= eom) |
90 | { |
91 | __set_errno (EMSGSIZE); |
92 | return -1; |
93 | } |
94 | *bp++ = '\0'; |
95 | } |
96 | if ((bp - dst) > MAXCDNAME) |
97 | { |
98 | __set_errno (EMSGSIZE); |
99 | return -1; |
100 | } |
101 | return 1; |
102 | } |
103 | if (c == 0 || *src == '.') |
104 | { |
105 | __set_errno (EMSGSIZE); |
106 | return -1; |
107 | } |
108 | label = bp++; |
109 | continue; |
110 | } |
111 | if (bp >= eom) |
112 | { |
113 | __set_errno (EMSGSIZE); |
114 | return -1; |
115 | } |
116 | *bp++ = (unsigned char) c; |
117 | } |
118 | if (escaped) /* Trailing backslash. */ |
119 | { |
120 | __set_errno (EMSGSIZE); |
121 | return -1; |
122 | } |
123 | c = (bp - label - 1); |
124 | if ((c & NS_CMPRSFLGS) != 0) /* Label too big. */ |
125 | { |
126 | __set_errno (EMSGSIZE); |
127 | return -1; |
128 | } |
129 | if (label >= eom) |
130 | { |
131 | __set_errno (EMSGSIZE); |
132 | return -1; |
133 | } |
134 | *label = c; |
135 | if (c != 0) |
136 | { |
137 | if (bp >= eom) |
138 | { |
139 | __set_errno (EMSGSIZE); |
140 | return -1; |
141 | } |
142 | *bp++ = 0; |
143 | } |
144 | if ((bp - dst) > MAXCDNAME) /* src too big. */ |
145 | { |
146 | __set_errno (EMSGSIZE); |
147 | return -1; |
148 | } |
149 | return 0; |
150 | } |
151 | versioned_symbol (libc, ___ns_name_pton, ns_name_pton, GLIBC_2_34); |
152 | versioned_symbol (libc, ___ns_name_pton, __ns_name_pton, GLIBC_PRIVATE); |
153 | libc_hidden_ver (___ns_name_pton, __ns_name_pton) |
154 | |
155 | #if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34) |
156 | compat_symbol (libresolv, ___ns_name_pton, ns_name_pton, GLIBC_2_9); |
157 | #endif |
158 | |