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Commit | Line | Data |
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276e9822 FW |
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 |