2 * Copyright (c) 1996,1999 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
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$BINDId: inet_net_pton.c,v 1.11 1999/01/08 19:23:44 vixie 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(af, src, dst, size)
65 return (inet_net_pton_ipv4(src, dst, size));
67 __set_errno (EAFNOSUPPORT);
74 * inet_net_pton_ipv4(src, dst, size)
75 * convert IPv4 network number from presentation to network format.
76 * accepts hex octets, hex strings, decimal octets, and /CIDR.
77 * "size" is in bytes and describes "dst".
79 * number of bits, either imputed classfully or specified with /CIDR,
80 * or -1 if some failure occurred (check errno). ENOENT means it was
81 * not an IPv4 network specification.
83 * network byte order assumed. this means 192.5.5.240/28 has
84 * 0b11110000 in its fourth octet.
86 * Paul Vixie (ISC), June 1996
89 inet_net_pton_ipv4(src, dst, size)
94 static const char xdigits[] = "0123456789abcdef";
95 int n, ch, tmp, dirty, bits;
96 const u_char *odst = dst;
99 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
100 && isascii(src[1]) && isxdigit(src[1])) {
101 /* Hexadecimal: Eat nybble string. */
105 tmp = 0; /* To calm down gcc. */
106 src++; /* skip x or X. */
107 while (isxdigit((ch = *src++))) {
109 n = (const char *) __rawmemchr(xdigits, ch) - xdigits;
110 assert(n >= 0 && n <= 15);
114 tmp = (tmp << 4) | n;
118 *dst++ = (u_char) tmp;
122 if (dirty) { /* Odd trailing nybble? */
125 *dst++ = (u_char) (tmp << 4);
127 } else if (isascii(ch) && isdigit(ch)) {
128 /* Decimal: eat dotted digit string. */
132 n = ((const char *) __rawmemchr(xdigits, ch)
134 assert(n >= 0 && n <= 9);
139 } while (isascii((ch = *src++)) && isdigit(ch));
142 *dst++ = (u_char) tmp;
143 if (ch == '\0' || ch == '/')
148 if (!isascii(ch) || !isdigit(ch))
155 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
156 /* CIDR width specifier. Nothing can follow it. */
157 ch = *src++; /* Skip over the /. */
160 n = (const char *) __rawmemchr(xdigits, ch) - xdigits;
161 assert(n >= 0 && n <= 9);
164 } while (isascii((ch = *src++)) && isdigit(ch));
171 /* Firey death and destruction unless we prefetched EOS. */
175 /* If nothing was written to the destination, we found no address. */
178 /* If no CIDR spec was given, infer width from net class. */
180 if (*odst >= 240) /* Class E */
182 else if (*odst >= 224) /* Class D */
184 else if (*odst >= 192) /* Class C */
186 else if (*odst >= 128) /* Class B */
190 /* If imputed mask is narrower than specified octets, widen. */
191 if (bits >= 8 && bits < ((dst - odst) * 8))
192 bits = (dst - odst) * 8;
194 /* Extend network to cover the actual mask. */
195 while (bits > ((dst - odst) * 8)) {
203 __set_errno (ENOENT);
207 __set_errno (EMSGSIZE);