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1 | /* Copyright (c) 1996 by Internet Software Consortium. |
2 | * | |
3 | * Permission to use, copy, modify, and distribute this software for any | |
4 | * purpose with or without fee is hereby granted, provided that the above | |
5 | * copyright notice and this permission notice appear in all copies. | |
6 | * | |
7 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS | |
8 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES | |
9 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE | |
10 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
11 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
12 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
13 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
14 | * SOFTWARE. | |
15 | */ | |
16 | ||
17 | #if defined(LIBC_SCCS) && !defined(lint) | |
18 | static char rcsid[] = "$Id: inet_pton.c,v 1.5 1996/09/27 03:24:16 drepper Exp $"; | |
19 | #endif /* LIBC_SCCS and not lint */ | |
20 | ||
21 | #include <sys/param.h> | |
22 | #include <sys/types.h> | |
23 | #include <sys/socket.h> | |
24 | #include <netinet/in.h> | |
25 | #include <arpa/inet.h> | |
26 | #include <arpa/nameser.h> | |
27 | #include <string.h> | |
28 | #include <errno.h> | |
29 | ||
30 | #include <linux/in6.h> | |
31 | #define IN6ADDRSZ sizeof(struct in6_addr) | |
32 | ||
33 | /* | |
34 | * WARNING: Don't even consider trying to compile this on a system where | |
35 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
36 | */ | |
37 | ||
38 | static int inet_pton4 __P((const char *src, u_char *dst)); | |
39 | static int inet_pton6 __P((const char *src, u_char *dst)); | |
40 | ||
41 | /* int | |
42 | * inet_pton(af, src, dst) | |
43 | * convert from presentation format (which usually means ASCII printable) | |
44 | * to network format (which is usually some kind of binary format). | |
45 | * return: | |
46 | * 1 if the address was valid for the specified address family | |
47 | * 0 if the address wasn't valid (`dst' is untouched in this case) | |
48 | * -1 if some other error occurred (`dst' is untouched in this case, too) | |
49 | * author: | |
50 | * Paul Vixie, 1996. | |
51 | */ | |
52 | int | |
53 | inet_pton(af, src, dst) | |
54 | int af; | |
55 | const char *src; | |
56 | void *dst; | |
57 | { | |
58 | switch (af) { | |
59 | case AF_INET: | |
60 | return (inet_pton4(src, dst)); | |
61 | case AF_INET6: | |
62 | return (inet_pton6(src, dst)); | |
63 | default: | |
64 | errno = EAFNOSUPPORT; | |
65 | return (-1); | |
66 | } | |
67 | /* NOTREACHED */ | |
68 | } | |
69 | ||
70 | /* int | |
71 | * inet_pton4(src, dst) | |
72 | * like inet_aton() but without all the hexadecimal and shorthand. | |
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 | |
81 | inet_pton4(src, dst) | |
82 | const char *src; | |
83 | u_char *dst; | |
84 | { | |
85 | static const char digits[] = "0123456789"; | |
86 | int saw_digit, octets, ch; | |
87 | u_char tmp[INADDRSZ], *tp; | |
88 | ||
89 | saw_digit = 0; | |
90 | octets = 0; | |
91 | *(tp = tmp) = 0; | |
92 | while ((ch = *src++) != '\0') { | |
93 | const char *pch; | |
94 | ||
95 | if ((pch = strchr(digits, ch)) != NULL) { | |
96 | u_int new = *tp * 10 + (pch - digits); | |
97 | ||
98 | if (new > 255) | |
99 | return (0); | |
100 | *tp = new; | |
101 | if (! saw_digit) { | |
102 | if (++octets > 4) | |
103 | return (0); | |
104 | saw_digit = 1; | |
105 | } | |
106 | } else if (ch == '.' && saw_digit) { | |
107 | if (octets == 4) | |
108 | return (0); | |
109 | *++tp = 0; | |
110 | saw_digit = 0; | |
111 | } else | |
112 | return (0); | |
113 | } | |
114 | if (octets < 4) | |
115 | return (0); | |
116 | ||
117 | memcpy(dst, tmp, INADDRSZ); | |
118 | return (1); | |
119 | } | |
120 | ||
121 | /* int | |
122 | * inet_pton6(src, dst) | |
123 | * convert presentation level address to network order binary form. | |
124 | * return: | |
125 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. | |
126 | * notice: | |
127 | * (1) does not touch `dst' unless it's returning 1. | |
128 | * (2) :: in a full address is silently ignored. | |
129 | * credit: | |
130 | * inspired by Mark Andrews. | |
131 | * author: | |
132 | * Paul Vixie, 1996. | |
133 | */ | |
134 | static int | |
135 | inet_pton6(src, dst) | |
136 | const char *src; | |
137 | u_char *dst; | |
138 | { | |
139 | static const char xdigits_l[] = "0123456789abcdef", | |
140 | xdigits_u[] = "0123456789ABCDEF"; | |
141 | u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp; | |
142 | const char *xdigits, *curtok; | |
143 | int ch, saw_xdigit; | |
144 | u_int val; | |
145 | ||
146 | memset((tp = tmp), '\0', IN6ADDRSZ); | |
147 | endp = tp + IN6ADDRSZ; | |
148 | colonp = NULL; | |
149 | /* Leading :: requires some special handling. */ | |
150 | if (*src == ':') | |
151 | if (*++src != ':') | |
152 | return (0); | |
153 | curtok = src; | |
154 | saw_xdigit = 0; | |
155 | val = 0; | |
156 | while ((ch = *src++) != '\0') { | |
157 | const char *pch; | |
158 | ||
159 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) | |
160 | pch = strchr((xdigits = xdigits_u), ch); | |
161 | if (pch != NULL) { | |
162 | val <<= 4; | |
163 | val |= (pch - xdigits); | |
164 | if (val > 0xffff) | |
165 | return (0); | |
166 | saw_xdigit = 1; | |
167 | continue; | |
168 | } | |
169 | if (ch == ':') { | |
170 | curtok = src; | |
171 | if (!saw_xdigit) { | |
172 | if (colonp) | |
173 | return (0); | |
174 | colonp = tp; | |
175 | continue; | |
176 | } | |
177 | if (tp + INT16SZ > endp) | |
178 | return (0); | |
179 | *tp++ = (u_char) (val >> 8) & 0xff; | |
180 | *tp++ = (u_char) val & 0xff; | |
181 | saw_xdigit = 0; | |
182 | val = 0; | |
183 | continue; | |
184 | } | |
185 | if (ch == '.' && ((tp + INADDRSZ) <= endp) && | |
186 | inet_pton4(curtok, tp) > 0) { | |
187 | tp += INADDRSZ; | |
188 | saw_xdigit = 0; | |
189 | break; /* '\0' was seen by inet_pton4(). */ | |
190 | } | |
191 | return (0); | |
192 | } | |
193 | if (saw_xdigit) { | |
194 | if (tp + INT16SZ > endp) | |
195 | return (0); | |
196 | *tp++ = (u_char) (val >> 8) & 0xff; | |
197 | *tp++ = (u_char) val & 0xff; | |
198 | } | |
199 | if (colonp != NULL) { | |
200 | /* | |
201 | * Since some memmove()'s erroneously fail to handle | |
202 | * overlapping regions, we'll do the shift by hand. | |
203 | */ | |
204 | const int n = tp - colonp; | |
205 | int i; | |
206 | ||
207 | for (i = 1; i <= n; i++) { | |
208 | endp[- i] = colonp[n - i]; | |
209 | colonp[n - i] = 0; | |
210 | } | |
211 | tp = endp; | |
212 | } | |
213 | if (tp != endp) | |
214 | return (0); | |
215 | memcpy(dst, tmp, IN6ADDRSZ); | |
216 | return (1); | |
217 | } |