1 | /* |
2 | * Copyright (c) 1996,1999 by 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 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) |
19 | static const char rcsid[] = "$BINDId: inet_pton.c,v 1.7 1999/10/13 16:39:28 vixie Exp $" ; |
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> |
28 | #include <ctype.h> |
29 | #include <string.h> |
30 | #include <errno.h> |
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 | |
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; |
39 | |
40 | /* int |
41 | * inet_pton(af, src, dst) |
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 |
52 | __inet_pton (int af, const char *src, void *dst) |
53 | { |
54 | switch (af) { |
55 | case AF_INET: |
56 | return (inet_pton4(src, dst)); |
57 | case AF_INET6: |
58 | return (inet_pton6(src, dst)); |
59 | default: |
60 | __set_errno (EAFNOSUPPORT); |
61 | return (-1); |
62 | } |
63 | /* NOTREACHED */ |
64 | } |
65 | libc_hidden_def (__inet_pton) |
66 | weak_alias (__inet_pton, inet_pton) |
67 | libc_hidden_weak (inet_pton) |
68 | |
69 | /* int |
70 | * inet_pton4(src, dst) |
71 | * like inet_aton() but without all the hexadecimal, octal (with the |
72 | * exception of 0) 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 | internal_function |
82 | inet_pton4 (const char *src, u_char *dst) |
83 | { |
84 | int saw_digit, octets, ch; |
85 | u_char tmp[NS_INADDRSZ], *tp; |
86 | |
87 | saw_digit = 0; |
88 | octets = 0; |
89 | *(tp = tmp) = 0; |
90 | while ((ch = *src++) != '\0') { |
91 | |
92 | if (ch >= '0' && ch <= '9') { |
93 | u_int new = *tp * 10 + (ch - '0'); |
94 | |
95 | if (saw_digit && *tp == 0) |
96 | return (0); |
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); |
115 | memcpy(dst, tmp, NS_INADDRSZ); |
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 |
133 | internal_function |
134 | inet_pton6 (const char *src, u_char *dst) |
135 | { |
136 | static const char xdigits[] = "0123456789abcdef" ; |
137 | u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
138 | const char *curtok; |
139 | int ch, saw_xdigit; |
140 | u_int val; |
141 | |
142 | tp = memset(tmp, '\0', NS_IN6ADDRSZ); |
143 | endp = tp + NS_IN6ADDRSZ; |
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; |
152 | while ((ch = tolower (*src++)) != '\0') { |
153 | const char *pch; |
154 | |
155 | pch = strchr(xdigits, ch); |
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; |
171 | } else if (*src == '\0') { |
172 | return (0); |
173 | } |
174 | if (tp + NS_INT16SZ > endp) |
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 | } |
182 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && |
183 | inet_pton4(curtok, tp) > 0) { |
184 | tp += NS_INADDRSZ; |
185 | saw_xdigit = 0; |
186 | break; /* '\0' was seen by inet_pton4(). */ |
187 | } |
188 | return (0); |
189 | } |
190 | if (saw_xdigit) { |
191 | if (tp + NS_INT16SZ > endp) |
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 | */ |
201 | const int n = tp - colonp; |
202 | int i; |
203 | |
204 | if (tp == endp) |
205 | return (0); |
206 | for (i = 1; i <= n; i++) { |
207 | endp[- i] = colonp[n - i]; |
208 | colonp[n - i] = 0; |
209 | } |
210 | tp = endp; |
211 | } |
212 | if (tp != endp) |
213 | return (0); |
214 | memcpy(dst, tmp, NS_IN6ADDRSZ); |
215 | return (1); |
216 | } |
217 | |