2 * Copyright (c) 1996 by Internet Software Consortium.
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.
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
17 * $From Id: inet_net_pton.c,v 1.8 1996/11/21 10:28:12 vixie Exp $
18 * $FreeBSD: src/lib/libc/net/inet_net_pton.c,v 1.6 1999/08/28 00:00:10 peter Exp $
19 * $DragonFly: src/lib/libc/net/inet_net_pton.c,v 1.4 2005/11/13 02:04:47 swildner Exp $
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
35 # define SPRINTF(x) strlen(sprintf/**/x)
37 # define SPRINTF(x) ((size_t)sprintf x)
40 static int inet_net_pton_ipv4 (const char *src, u_char *dst,
45 * inet_net_pton(af, src, dst, size)
46 * convert network number from presentation to network format.
47 * accepts hex octets, hex strings, decimal octets, and /CIDR.
48 * "size" is in bytes and describes "dst".
50 * number of bits, either imputed classfully or specified with /CIDR,
51 * or -1 if some failure occurred (check errno). ENOENT means it was
52 * not a valid network specification.
54 * Paul Vixie (ISC), June 1996
57 inet_net_pton(int af, const char *src, void *dst, size_t size)
61 return (inet_net_pton_ipv4(src, dst, size));
70 * inet_net_pton_ipv4(src, dst, size)
71 * convert IPv4 network number from presentation to network format.
72 * accepts hex octets, hex strings, decimal octets, and /CIDR.
73 * "size" is in bytes and describes "dst".
75 * number of bits, either imputed classfully or specified with /CIDR,
76 * or -1 if some failure occurred (check errno). ENOENT means it was
77 * not an IPv4 network specification.
79 * network byte order assumed. this means 192.5.5.240/28 has
80 * 0x11110000 in its fourth octet.
82 * Paul Vixie (ISC), June 1996
85 inet_net_pton_ipv4(const char *src, u_char *dst, size_t size)
88 xdigits[] = "0123456789abcdef",
89 digits[] = "0123456789";
90 int n, ch, tmp, dirty, bits;
91 const u_char *odst = dst;
94 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
95 && isascii(src[1]) && isxdigit(src[1])) {
96 /* Hexadecimal: Eat nybble string. */
100 src++; /* skip x or X. */
101 while ((ch = *src++) != '\0' &&
102 isascii(ch) && isxdigit(ch)) {
105 n = strchr(xdigits, ch) - xdigits;
106 assert(n >= 0 && n <= 15);
111 *++dst = 0, dirty = 0;
117 } else if (isascii(ch) && isdigit(ch)) {
118 /* Decimal: eat dotted digit string. */
122 n = strchr(digits, ch) - digits;
123 assert(n >= 0 && n <= 9);
128 } while ((ch = *src++) != '\0' &&
129 isascii(ch) && isdigit(ch));
132 *dst++ = (u_char) tmp;
133 if (ch == '\0' || ch == '/')
138 if (!isascii(ch) || !isdigit(ch))
145 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
146 /* CIDR width specifier. Nothing can follow it. */
147 ch = *src++; /* Skip over the /. */
150 n = strchr(digits, ch) - digits;
151 assert(n >= 0 && n <= 9);
154 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
161 /* Firey death and destruction unless we prefetched EOS. */
165 /* If nothing was written to the destination, we found no address. */
168 /* If no CIDR spec was given, infer width from net class. */
170 if (*odst >= 240) /* Class E */
172 else if (*odst >= 224) /* Class D */
174 else if (*odst >= 192) /* Class C */
176 else if (*odst >= 128) /* Class B */
180 /* If imputed mask is narrower than specified octets, widen. */
181 if (bits >= 8 && bits < ((dst - odst) * 8))
182 bits = (dst - odst) * 8;
184 /* Extend network to cover the actual mask. */
185 while (bits > ((dst - odst) * 8)) {
202 * Weak aliases for applications that use certain private entry points,
203 * and fail to include <arpa/inet.h>.
206 __weak_reference(__inet_net_pton, inet_net_pton);