Annotation of src/lib/libc/inet/inet_cidr_pton.c, Revision 1.9
1.9 ! maya 1: /* $NetBSD: inet_cidr_pton.c,v 1.8 2012/03/20 17:08:13 matt Exp $ */
1.1 christos 2:
3: /*
4: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5: * Copyright (c) 1998,1999 by Internet Software Consortium.
6: *
7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
10: *
11: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18: */
19:
1.2 christos 20: #include <sys/cdefs.h>
1.1 christos 21: #if defined(LIBC_SCCS) && !defined(lint)
1.2 christos 22: #if 0
1.5 christos 23: static const char rcsid[] = "Id: inet_cidr_pton.c,v 1.6 2005/04/27 04:56:19 sra Exp";
1.2 christos 24: #else
1.9 ! maya 25: __RCSID("$NetBSD: inet_cidr_pton.c,v 1.8 2012/03/20 17:08:13 matt Exp $");
1.2 christos 26: #endif
1.1 christos 27: #endif
28:
29: #include "port_before.h"
30:
1.2 christos 31: #include "namespace.h"
1.1 christos 32: #include <sys/types.h>
33: #include <sys/socket.h>
34: #include <netinet/in.h>
35: #include <arpa/nameser.h>
36: #include <arpa/inet.h>
37:
38: #include <isc/assertions.h>
39: #include <ctype.h>
40: #include <errno.h>
41: #include <stdio.h>
42: #include <string.h>
1.7 christos 43: #include <stddef.h>
1.1 christos 44: #include <stdlib.h>
45:
46: #include "port_after.h"
47:
1.2 christos 48: #ifdef __weak_alias
49: __weak_alias(inet_cidr_pton,_inet_cidr_pton)
50: #endif
51:
1.8 matt 52: static int inet_cidr_pton_ipv4(const char *src, u_char *dst,
53: int *bits, int ipv6);
54: static int inet_cidr_pton_ipv6(const char *src, u_char *dst, int *bits);
1.1 christos 55:
56: static int getbits(const char *, int ipv6);
57:
1.3 christos 58: /*%
1.1 christos 59: * int
60: * inet_cidr_pton(af, src, dst, *bits)
61: * convert network address from presentation to network format.
62: * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
63: * "dst" is assumed large enough for its "af". "bits" is set to the
64: * /CIDR prefix length, which can have defaults (like /32 for IPv4).
65: * return:
66: * -1 if an error occurred (inspect errno; ENOENT means bad format).
67: * 0 if successful conversion occurred.
68: * note:
69: * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
70: * as called for by inet_net_pton() but it can be a host address with
71: * an included netmask.
72: * author:
73: * Paul Vixie (ISC), October 1998
74: */
75: int
76: inet_cidr_pton(int af, const char *src, void *dst, int *bits) {
77: switch (af) {
78: case AF_INET:
79: return (inet_cidr_pton_ipv4(src, dst, bits, 0));
80: case AF_INET6:
81: return (inet_cidr_pton_ipv6(src, dst, bits));
82: default:
83: errno = EAFNOSUPPORT;
84: return (-1);
85: }
86: }
87:
88: static const char digits[] = "0123456789";
89:
90: static int
91: inet_cidr_pton_ipv4(const char *src, u_char *dst, int *pbits, int ipv6) {
92: const u_char *odst = dst;
1.7 christos 93: int ch, bits;
94: ptrdiff_t n, tmp;
1.1 christos 95: size_t size = 4;
96:
97: /* Get the mantissa. */
98: while (ch = *src++, (isascii(ch) && isdigit(ch))) {
99: tmp = 0;
100: do {
101: n = strchr(digits, ch) - digits;
102: INSIST(n >= 0 && n <= 9);
103: tmp *= 10;
104: tmp += n;
105: if (tmp > 255)
106: goto enoent;
107: } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
108: if (size-- == 0U)
109: goto emsgsize;
110: *dst++ = (u_char) tmp;
111: if (ch == '\0' || ch == '/')
112: break;
113: if (ch != '.')
114: goto enoent;
115: }
116:
117: /* Get the prefix length if any. */
118: bits = -1;
119: if (ch == '/' && dst > odst) {
120: bits = getbits(src, ipv6);
121: if (bits == -2)
122: goto enoent;
123: } else if (ch != '\0')
124: goto enoent;
125:
126: /* Prefix length can default to /32 only if all four octets spec'd. */
127: if (bits == -1) {
128: if (dst - odst == 4)
129: bits = ipv6 ? 128 : 32;
130: else
131: goto enoent;
132: }
133:
134: /* If nothing was written to the destination, we found no address. */
135: if (dst == odst)
136: goto enoent;
137:
138: /* If prefix length overspecifies mantissa, life is bad. */
139: if (((bits - (ipv6 ? 96 : 0)) / 8) > (dst - odst))
140: goto enoent;
141:
142: /* Extend address to four octets. */
143: while (size-- > 0U)
144: *dst++ = 0;
145:
146: *pbits = bits;
147: return (0);
148:
149: enoent:
150: errno = ENOENT;
151: return (-1);
152:
153: emsgsize:
154: errno = EMSGSIZE;
155: return (-1);
156: }
157:
158: static int
159: inet_cidr_pton_ipv6(const char *src, u_char *dst, int *pbits) {
160: static const char xdigits_l[] = "0123456789abcdef",
161: xdigits_u[] = "0123456789ABCDEF";
162: u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
163: const char *xdigits, *curtok;
164: int ch, saw_xdigit;
165: u_int val;
166: int bits;
167:
168: memset((tp = tmp), '\0', NS_IN6ADDRSZ);
169: endp = tp + NS_IN6ADDRSZ;
170: colonp = NULL;
171: /* Leading :: requires some special handling. */
172: if (*src == ':')
173: if (*++src != ':')
174: return (0);
175: curtok = src;
176: saw_xdigit = 0;
177: val = 0;
178: bits = -1;
179: while ((ch = *src++) != '\0') {
180: const char *pch;
181:
182: if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
183: pch = strchr((xdigits = xdigits_u), ch);
184: if (pch != NULL) {
185: val <<= 4;
1.7 christos 186: val |= (int)(pch - xdigits);
1.1 christos 187: if (val > 0xffff)
188: return (0);
189: saw_xdigit = 1;
190: continue;
191: }
192: if (ch == ':') {
193: curtok = src;
194: if (!saw_xdigit) {
195: if (colonp)
196: return (0);
197: colonp = tp;
198: continue;
199: } else if (*src == '\0') {
200: return (0);
201: }
202: if (tp + NS_INT16SZ > endp)
203: return (0);
204: *tp++ = (u_char) (val >> 8) & 0xff;
205: *tp++ = (u_char) val & 0xff;
206: saw_xdigit = 0;
207: val = 0;
208: continue;
209: }
210: if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
211: inet_cidr_pton_ipv4(curtok, tp, &bits, 1) == 0) {
212: tp += NS_INADDRSZ;
213: saw_xdigit = 0;
1.3 christos 214: break; /*%< '\\0' was seen by inet_pton4(). */
1.1 christos 215: }
216: if (ch == '/') {
217: bits = getbits(src, 1);
218: if (bits == -2)
219: goto enoent;
220: break;
221: }
222: goto enoent;
223: }
224: if (saw_xdigit) {
225: if (tp + NS_INT16SZ > endp)
226: goto emsgsize;
227: *tp++ = (u_char) (val >> 8) & 0xff;
228: *tp++ = (u_char) val & 0xff;
229: }
230: if (colonp != NULL) {
231: /*
232: * Since some memmove()'s erroneously fail to handle
233: * overlapping regions, we'll do the shift by hand.
234: */
1.7 christos 235: const ptrdiff_t n = tp - colonp;
1.1 christos 236: int i;
237:
238: if (tp == endp)
239: goto enoent;
240: for (i = 1; i <= n; i++) {
241: endp[- i] = colonp[n - i];
242: colonp[n - i] = 0;
243: }
244: tp = endp;
245: }
246:
247: memcpy(dst, tmp, NS_IN6ADDRSZ);
248:
249: *pbits = bits;
250: return (0);
251:
252: enoent:
253: errno = ENOENT;
254: return (-1);
255:
256: emsgsize:
257: errno = EMSGSIZE;
258: return (-1);
259: }
260:
261: static int
262: getbits(const char *src, int ipv6) {
263: int bits = 0;
264: char *cp, ch;
265:
1.3 christos 266: if (*src == '\0') /*%< syntax */
1.1 christos 267: return (-2);
268: do {
269: ch = *src++;
270: cp = strchr(digits, ch);
1.3 christos 271: if (cp == NULL) /*%< syntax */
1.1 christos 272: return (-2);
273: bits *= 10;
1.7 christos 274: bits += (int)(cp - digits);
1.3 christos 275: if (bits == 0 && *src != '\0') /*%< no leading zeros */
1.1 christos 276: return (-2);
1.3 christos 277: if (bits > (ipv6 ? 128 : 32)) /*%< range error */
1.1 christos 278: return (-2);
279: } while (*src != '\0');
280:
281: return (bits);
282: }
1.3 christos 283:
284: /*! \file */
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