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e685e07d UD |
1 | /* |
2 | * Copyright (c) 1996,1999 by Internet Software Consortium. | |
fa0bc87c RM |
3 | * |
4 | * Permission to use, copy, modify, and distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS | |
9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES | |
10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE | |
11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
15 | * SOFTWARE. | |
16 | */ | |
17 | ||
18 | #if defined(LIBC_SCCS) && !defined(lint) | |
e685e07d | 19 | static const char rcsid[] = "$BINDId: inet_pton.c,v 1.7 1999/10/13 16:39:28 vixie Exp $"; |
fa0bc87c RM |
20 | #endif /* LIBC_SCCS and not lint */ |
21 | ||
22 | #include <sys/param.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/socket.h> | |
25 | #include <netinet/in.h> | |
26 | #include <arpa/inet.h> | |
27 | #include <arpa/nameser.h> | |
8a40ed68 | 28 | #include <ctype.h> |
fa0bc87c RM |
29 | #include <string.h> |
30 | #include <errno.h> | |
fa0bc87c RM |
31 | |
32 | /* | |
33 | * WARNING: Don't even consider trying to compile this on a system where | |
34 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
35 | */ | |
36 | ||
2588068b UD |
37 | static int inet_pton4 (const char *src, u_char *dst) internal_function; |
38 | static int inet_pton6 (const char *src, u_char *dst) internal_function; | |
fa0bc87c RM |
39 | |
40 | /* int | |
613a76ff | 41 | * inet_pton(af, src, dst) |
fa0bc87c RM |
42 | * convert from presentation format (which usually means ASCII printable) |
43 | * to network format (which is usually some kind of binary format). | |
44 | * return: | |
45 | * 1 if the address was valid for the specified address family | |
46 | * 0 if the address wasn't valid (`dst' is untouched in this case) | |
47 | * -1 if some other error occurred (`dst' is untouched in this case, too) | |
48 | * author: | |
49 | * Paul Vixie, 1996. | |
50 | */ | |
51 | int | |
9d46370c | 52 | __inet_pton (int af, const char *src, void *dst) |
fa0bc87c RM |
53 | { |
54 | switch (af) { | |
55 | case AF_INET: | |
fa0bc87c RM |
56 | return (inet_pton4(src, dst)); |
57 | case AF_INET6: | |
fa0bc87c RM |
58 | return (inet_pton6(src, dst)); |
59 | default: | |
c4029823 | 60 | __set_errno (EAFNOSUPPORT); |
fa0bc87c RM |
61 | return (-1); |
62 | } | |
63 | /* NOTREACHED */ | |
64 | } | |
8ac5a76a JM |
65 | libc_hidden_def (__inet_pton) |
66 | weak_alias (__inet_pton, inet_pton) | |
67 | libc_hidden_weak (inet_pton) | |
fa0bc87c RM |
68 | |
69 | /* int | |
70 | * inet_pton4(src, dst) | |
08bcfb59 UD |
71 | * like inet_aton() but without all the hexadecimal, octal (with the |
72 | * exception of 0) and shorthand. | |
fa0bc87c RM |
73 | * return: |
74 | * 1 if `src' is a valid dotted quad, else 0. | |
75 | * notice: | |
76 | * does not touch `dst' unless it's returning 1. | |
77 | * author: | |
78 | * Paul Vixie, 1996. | |
79 | */ | |
80 | static int | |
dfd2257a | 81 | internal_function |
9d46370c | 82 | inet_pton4 (const char *src, u_char *dst) |
fa0bc87c | 83 | { |
fa0bc87c | 84 | int saw_digit, octets, ch; |
e685e07d | 85 | u_char tmp[NS_INADDRSZ], *tp; |
fa0bc87c RM |
86 | |
87 | saw_digit = 0; | |
88 | octets = 0; | |
89 | *(tp = tmp) = 0; | |
90 | while ((ch = *src++) != '\0') { | |
fa0bc87c | 91 | |
61fab08a UD |
92 | if (ch >= '0' && ch <= '9') { |
93 | u_int new = *tp * 10 + (ch - '0'); | |
fa0bc87c | 94 | |
08bcfb59 UD |
95 | if (saw_digit && *tp == 0) |
96 | return (0); | |
fa0bc87c RM |
97 | if (new > 255) |
98 | return (0); | |
99 | *tp = new; | |
100 | if (! saw_digit) { | |
101 | if (++octets > 4) | |
102 | return (0); | |
103 | saw_digit = 1; | |
104 | } | |
105 | } else if (ch == '.' && saw_digit) { | |
106 | if (octets == 4) | |
107 | return (0); | |
108 | *++tp = 0; | |
109 | saw_digit = 0; | |
110 | } else | |
111 | return (0); | |
112 | } | |
113 | if (octets < 4) | |
114 | return (0); | |
e685e07d | 115 | memcpy(dst, tmp, NS_INADDRSZ); |
fa0bc87c RM |
116 | return (1); |
117 | } | |
118 | ||
119 | /* int | |
120 | * inet_pton6(src, dst) | |
121 | * convert presentation level address to network order binary form. | |
122 | * return: | |
123 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. | |
124 | * notice: | |
125 | * (1) does not touch `dst' unless it's returning 1. | |
126 | * (2) :: in a full address is silently ignored. | |
127 | * credit: | |
128 | * inspired by Mark Andrews. | |
129 | * author: | |
130 | * Paul Vixie, 1996. | |
131 | */ | |
132 | static int | |
dfd2257a | 133 | internal_function |
9d46370c | 134 | inet_pton6 (const char *src, u_char *dst) |
fa0bc87c | 135 | { |
61fab08a | 136 | static const char xdigits[] = "0123456789abcdef"; |
e685e07d | 137 | u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
61fab08a | 138 | const char *curtok; |
fa0bc87c RM |
139 | int ch, saw_xdigit; |
140 | u_int val; | |
141 | ||
e685e07d UD |
142 | tp = memset(tmp, '\0', NS_IN6ADDRSZ); |
143 | endp = tp + NS_IN6ADDRSZ; | |
fa0bc87c RM |
144 | colonp = NULL; |
145 | /* Leading :: requires some special handling. */ | |
146 | if (*src == ':') | |
147 | if (*++src != ':') | |
148 | return (0); | |
149 | curtok = src; | |
150 | saw_xdigit = 0; | |
151 | val = 0; | |
61fab08a | 152 | while ((ch = tolower (*src++)) != '\0') { |
fa0bc87c RM |
153 | const char *pch; |
154 | ||
61fab08a | 155 | pch = strchr(xdigits, ch); |
fa0bc87c RM |
156 | if (pch != NULL) { |
157 | val <<= 4; | |
158 | val |= (pch - xdigits); | |
159 | if (val > 0xffff) | |
160 | return (0); | |
161 | saw_xdigit = 1; | |
162 | continue; | |
163 | } | |
164 | if (ch == ':') { | |
165 | curtok = src; | |
166 | if (!saw_xdigit) { | |
167 | if (colonp) | |
168 | return (0); | |
169 | colonp = tp; | |
170 | continue; | |
e685e07d UD |
171 | } else if (*src == '\0') { |
172 | return (0); | |
fa0bc87c | 173 | } |
e685e07d | 174 | if (tp + NS_INT16SZ > endp) |
fa0bc87c RM |
175 | return (0); |
176 | *tp++ = (u_char) (val >> 8) & 0xff; | |
177 | *tp++ = (u_char) val & 0xff; | |
178 | saw_xdigit = 0; | |
179 | val = 0; | |
180 | continue; | |
181 | } | |
e685e07d | 182 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && |
fa0bc87c | 183 | inet_pton4(curtok, tp) > 0) { |
e685e07d | 184 | tp += NS_INADDRSZ; |
fa0bc87c RM |
185 | saw_xdigit = 0; |
186 | break; /* '\0' was seen by inet_pton4(). */ | |
187 | } | |
188 | return (0); | |
189 | } | |
190 | if (saw_xdigit) { | |
e685e07d | 191 | if (tp + NS_INT16SZ > endp) |
fa0bc87c RM |
192 | return (0); |
193 | *tp++ = (u_char) (val >> 8) & 0xff; | |
194 | *tp++ = (u_char) val & 0xff; | |
195 | } | |
196 | if (colonp != NULL) { | |
197 | /* | |
198 | * Since some memmove()'s erroneously fail to handle | |
199 | * overlapping regions, we'll do the shift by hand. | |
200 | */ | |
613a76ff | 201 | const int n = tp - colonp; |
fa0bc87c RM |
202 | int i; |
203 | ||
e685e07d UD |
204 | if (tp == endp) |
205 | return (0); | |
613a76ff RM |
206 | for (i = 1; i <= n; i++) { |
207 | endp[- i] = colonp[n - i]; | |
208 | colonp[n - i] = 0; | |
fa0bc87c RM |
209 | } |
210 | tp = endp; | |
211 | } | |
212 | if (tp != endp) | |
213 | return (0); | |
e685e07d | 214 | memcpy(dst, tmp, NS_IN6ADDRSZ); |
fa0bc87c RM |
215 | return (1); |
216 | } |