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1 | /* | |
2 | * Copyright (C) 1996-2001 Internet Software Consortium. | |
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 | |
9 | * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL | |
10 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL | |
11 | * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, | |
12 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING | |
13 | * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, | |
14 | * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION | |
15 | * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
16 | */ | |
17 | ||
18 | #include <errno.h> | |
19 | #include <sys/types.h> | |
20 | #include <sys/socket.h> | |
21 | #include <netinet/in.h> | |
22 | #include <arpa/inet.h> | |
23 | #include <stdio.h> | |
24 | #include <string.h> | |
25 | ||
26 | #ifndef NS_INT16SZ | |
27 | #define NS_INT16SZ 2 | |
28 | #endif | |
29 | ||
30 | #ifndef NS_INADDRSZ | |
31 | #define NS_INADDRSZ 4 | |
32 | #endif | |
33 | ||
34 | #ifndef NS_IN6ADDRSZ | |
35 | #define NS_IN6ADDRSZ 16 | |
36 | #endif | |
37 | ||
38 | /* | |
39 | * WARNING: Don't even consider trying to compile this on a system where | |
40 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
41 | */ | |
42 | ||
43 | static int inet_pton4(const char *src, unsigned char *dst); | |
44 | static int inet_pton6(const char *src, unsigned char *dst); | |
45 | ||
46 | /* int | |
47 | * inet_pton4(src, dst) | |
48 | * like inet_aton() but without all the hexadecimal and shorthand. | |
49 | * return: | |
50 | * 1 if `src' is a valid dotted quad, else 0. | |
51 | * notice: | |
52 | * does not touch `dst' unless it's returning 1. | |
53 | * author: | |
54 | * Paul Vixie, 1996. | |
55 | */ | |
56 | static int | |
57 | inet_pton4(const char *src, unsigned char *dst) | |
58 | { | |
59 | static const char digits[] = "0123456789"; | |
60 | int saw_digit, octets, ch; | |
61 | unsigned char tmp[NS_INADDRSZ], *tp; | |
62 | ||
63 | saw_digit = 0; | |
64 | octets = 0; | |
65 | *(tp = tmp) = 0; | |
66 | while ((ch = *src++) != '\0') { | |
67 | const char *pch; | |
68 | ||
69 | if ((pch = strchr(digits, ch)) != NULL) { | |
70 | unsigned int new = *tp * 10 + (pch - digits); | |
71 | ||
72 | if (new > 255) | |
73 | return (0); | |
74 | *tp = new; | |
75 | if (! saw_digit) { | |
76 | if (++octets > 4) | |
77 | return (0); | |
78 | saw_digit = 1; | |
79 | } | |
80 | } else if (ch == '.' && saw_digit) { | |
81 | if (octets == 4) | |
82 | return (0); | |
83 | *++tp = 0; | |
84 | saw_digit = 0; | |
85 | } else | |
86 | return (0); | |
87 | } | |
88 | if (octets < 4) | |
89 | return (0); | |
90 | memcpy(dst, tmp, NS_INADDRSZ); | |
91 | return (1); | |
92 | } | |
93 | ||
94 | /* int | |
95 | * inet_pton6(src, dst) | |
96 | * convert presentation level address to network order binary form. | |
97 | * return: | |
98 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. | |
99 | * notice: | |
100 | * (1) does not touch `dst' unless it's returning 1. | |
101 | * (2) :: in a full address is silently ignored. | |
102 | * credit: | |
103 | * inspired by Mark Andrews. | |
104 | * author: | |
105 | * Paul Vixie, 1996. | |
106 | */ | |
107 | ||
108 | #ifndef NO_IPV6 | |
109 | static int | |
110 | inet_pton6(const char *src, unsigned char *dst) | |
111 | { | |
112 | static const char xdigits_l[] = "0123456789abcdef", | |
113 | xdigits_u[] = "0123456789ABCDEF"; | |
114 | unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; | |
115 | const char *xdigits, *curtok; | |
116 | int ch, saw_xdigit; | |
117 | unsigned int val; | |
118 | ||
119 | memset((tp = tmp), '\0', NS_IN6ADDRSZ); | |
120 | endp = tp + NS_IN6ADDRSZ; | |
121 | colonp = NULL; | |
122 | /* Leading :: requires some special handling. */ | |
123 | if (*src == ':') | |
124 | if (*++src != ':') | |
125 | return (0); | |
126 | curtok = src; | |
127 | saw_xdigit = 0; | |
128 | val = 0; | |
129 | while ((ch = *src++) != '\0') { | |
130 | const char *pch; | |
131 | ||
132 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) | |
133 | pch = strchr((xdigits = xdigits_u), ch); | |
134 | if (pch != NULL) { | |
135 | val <<= 4; | |
136 | val |= (pch - xdigits); | |
137 | if (val > 0xffff) | |
138 | return (0); | |
139 | saw_xdigit = 1; | |
140 | continue; | |
141 | } | |
142 | if (ch == ':') { | |
143 | curtok = src; | |
144 | if (!saw_xdigit) { | |
145 | if (colonp) | |
146 | return (0); | |
147 | colonp = tp; | |
148 | continue; | |
149 | } | |
150 | if (tp + NS_INT16SZ > endp) | |
151 | return (0); | |
152 | *tp++ = (unsigned char) (val >> 8) & 0xff; | |
153 | *tp++ = (unsigned char) val & 0xff; | |
154 | saw_xdigit = 0; | |
155 | val = 0; | |
156 | continue; | |
157 | } | |
158 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && | |
159 | inet_pton4(curtok, tp) > 0) { | |
160 | tp += NS_INADDRSZ; | |
161 | saw_xdigit = 0; | |
162 | break; /* '\0' was seen by inet_pton4(). */ | |
163 | } | |
164 | return (0); | |
165 | } | |
166 | if (saw_xdigit) { | |
167 | if (tp + NS_INT16SZ > endp) | |
168 | return (0); | |
169 | *tp++ = (unsigned char) (val >> 8) & 0xff; | |
170 | *tp++ = (unsigned char) val & 0xff; | |
171 | } | |
172 | if (colonp != NULL) { | |
173 | /* | |
174 | * Since some memmove()'s erroneously fail to handle | |
175 | * overlapping regions, we'll do the shift by hand. | |
176 | */ | |
177 | const int n = tp - colonp; | |
178 | int i; | |
179 | ||
180 | for (i = 1; i <= n; i++) { | |
181 | endp[- i] = colonp[n - i]; | |
182 | colonp[n - i] = 0; | |
183 | } | |
184 | tp = endp; | |
185 | } | |
186 | if (tp != endp) | |
187 | return (0); | |
188 | memcpy(dst, tmp, NS_IN6ADDRSZ); | |
189 | return (1); | |
190 | } | |
191 | #endif | |
192 | ||
193 | /* int | |
194 | * isc_net_pton(af, src, dst) | |
195 | * convert from presentation format (which usually means ASCII printable) | |
196 | * to network format (which is usually some kind of binary format). | |
197 | * return: | |
198 | * 1 if the address was valid for the specified address family | |
199 | * 0 if the address wasn't valid (`dst' is untouched in this case) | |
200 | * -1 if some other error occurred (`dst' is untouched in this case, too) | |
201 | * author: | |
202 | * Paul Vixie, 1996. | |
203 | */ | |
204 | int | |
205 | inet_pton(int af, const char *src, void *dst) | |
206 | { | |
207 | switch (af) { | |
208 | case AF_INET: | |
209 | return (inet_pton4(src, dst)); | |
210 | #ifndef NO_IPV6 | |
211 | case AF_INET6: | |
212 | return (inet_pton6(src, dst)); | |
213 | #endif | |
214 | default: | |
215 | errno = EAFNOSUPPORT; | |
216 | return (-1); | |
217 | } | |
218 | /* NOTREACHED */ | |
219 | } |