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1.1 misho 1: /*
2: * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
3: * Copyright (C) 1996-2003 Internet Software Consortium.
4: *
5: * Permission to use, copy, modify, and/or 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 WITH
10: * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11: * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12: * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13: * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14: * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15: * PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: /*! \file */
19:
20: #if defined(LIBC_SCCS) && !defined(lint)
21: static char rcsid[] =
22: "$Id: inet_pton.c,v 1.19 2007/06/19 23:47:17 tbox Exp $";
23: #endif /* LIBC_SCCS and not lint */
24:
25: #include <config.h>
26:
27: #include <errno.h>
28: #include <string.h>
29:
30: #include <isc/net.h>
31:
32: /*% INT16 Size */
33: #define NS_INT16SZ 2
34: /*% IPv4 Address Size */
35: #define NS_INADDRSZ 4
36: /*% IPv6 Address Size */
37: #define NS_IN6ADDRSZ 16
38:
39: /*
40: * WARNING: Don't even consider trying to compile this on a system where
41: * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
42: */
43:
44: static int inet_pton4(const char *src, unsigned char *dst);
45: static int inet_pton6(const char *src, unsigned char *dst);
46:
47: /*%
48: * convert from presentation format (which usually means ASCII printable)
49: * to network format (which is usually some kind of binary format).
50: * \return
51: * 1 if the address was valid for the specified address family
52: * 0 if the address wasn't valid (`dst' is untouched in this case)
53: * -1 if some other error occurred (`dst' is untouched in this case, too)
54: * \author
55: * Paul Vixie, 1996.
56: */
57: int
58: isc_net_pton(int af, const char *src, void *dst) {
59: switch (af) {
60: case AF_INET:
61: return (inet_pton4(src, dst));
62: case AF_INET6:
63: return (inet_pton6(src, dst));
64: default:
65: errno = EAFNOSUPPORT;
66: return (-1);
67: }
68: /* NOTREACHED */
69: }
70:
71: /*!\fn static int inet_pton4(const char *src, unsigned char *dst)
72: * \brief
73: * like inet_aton() but without all the hexadecimal and shorthand.
74: * \return
75: * 1 if `src' is a valid dotted quad, else 0.
76: * \note
77: * does not touch `dst' unless it's returning 1.
78: * \author
79: * Paul Vixie, 1996.
80: */
81: static int
82: inet_pton4(const char *src, unsigned char *dst) {
83: static const char digits[] = "0123456789";
84: int saw_digit, octets, ch;
85: unsigned char tmp[NS_INADDRSZ], *tp;
86:
87: saw_digit = 0;
88: octets = 0;
89: *(tp = tmp) = 0;
90: while ((ch = *src++) != '\0') {
91: const char *pch;
92:
93: if ((pch = strchr(digits, ch)) != NULL) {
94: unsigned int newv = *tp * 10 + (pch - digits);
95:
96: if (saw_digit && *tp == 0)
97: return (0);
98: if (newv > 255)
99: return (0);
100: *tp = (unsigned char)newv;
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: memcpy(dst, tmp, NS_INADDRSZ);
117: return (1);
118: }
119:
120: /*%
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: * \note
125: * (1) does not touch `dst' unless it's returning 1.
126: * \note
127: * (2) :: in a full address is silently ignored.
128: * \author
129: * inspired by Mark Andrews.
130: * \author
131: * Paul Vixie, 1996.
132: */
133: static int
134: inet_pton6(const char *src, unsigned char *dst) {
135: static const char xdigits_l[] = "0123456789abcdef",
136: xdigits_u[] = "0123456789ABCDEF";
137: unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
138: const char *xdigits, *curtok;
139: int ch, seen_xdigits;
140: unsigned int val;
141:
142: memset((tp = 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: seen_xdigits = 0;
151: val = 0;
152: while ((ch = *src++) != '\0') {
153: const char *pch;
154:
155: if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
156: pch = strchr((xdigits = xdigits_u), ch);
157: if (pch != NULL) {
158: val <<= 4;
159: val |= (pch - xdigits);
160: if (++seen_xdigits > 4)
161: return (0);
162: continue;
163: }
164: if (ch == ':') {
165: curtok = src;
166: if (!seen_xdigits) {
167: if (colonp)
168: return (0);
169: colonp = tp;
170: continue;
171: }
172: if (tp + NS_INT16SZ > endp)
173: return (0);
174: *tp++ = (unsigned char) (val >> 8) & 0xff;
175: *tp++ = (unsigned char) val & 0xff;
176: seen_xdigits = 0;
177: val = 0;
178: continue;
179: }
180: if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
181: inet_pton4(curtok, tp) > 0) {
182: tp += NS_INADDRSZ;
183: seen_xdigits = 0;
184: break; /* '\0' was seen by inet_pton4(). */
185: }
186: return (0);
187: }
188: if (seen_xdigits) {
189: if (tp + NS_INT16SZ > endp)
190: return (0);
191: *tp++ = (unsigned char) (val >> 8) & 0xff;
192: *tp++ = (unsigned char) val & 0xff;
193: }
194: if (colonp != NULL) {
195: /*
196: * Since some memmove()'s erroneously fail to handle
197: * overlapping regions, we'll do the shift by hand.
198: */
199: const int n = tp - colonp;
200: int i;
201:
202: if (tp == endp)
203: return (0);
204: for (i = 1; i <= n; i++) {
205: endp[- i] = colonp[n - i];
206: colonp[n - i] = 0;
207: }
208: tp = endp;
209: }
210: if (tp != endp)
211: return (0);
212: memcpy(dst, tmp, NS_IN6ADDRSZ);
213: return (1);
214: }