[apple/libc.git] / net / FreeBSD / inet_net_pton.c

/*
 * Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char orig_rcsid[] = "From Id: inet_net_pton.c,v 1.8 1996/11/21 10:28:12 vixie Exp $";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/net/inet_net_pton.c,v 1.8 2002/03/22 21:52:29 obrien Exp $");

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif

static int	inet_net_pton_ipv4(const char *src, u_char *dst, size_t size);

/*
 * static int
 * inet_net_pton(af, src, dst, size)
 *	convert network number from presentation to network format.
 *	accepts hex octets, hex strings, decimal octets, and /CIDR.
 *	"size" is in bytes and describes "dst".
 * return:
 *	number of bits, either imputed classfully or specified with /CIDR,
 *	or -1 if some failure occurred (check errno).  ENOENT means it was
 *	not a valid network specification.
 * author:
 *	Paul Vixie (ISC), June 1996
 */
int
inet_net_pton(af, src, dst, size)
	int af;
	const char *src;
	void *dst;
	size_t size;
{
	switch (af) {
	case AF_INET:
		return (inet_net_pton_ipv4(src, dst, size));
	default:
		errno = EAFNOSUPPORT;
		return (-1);
	}
}

/*
 * static int
 * inet_net_pton_ipv4(src, dst, size)
 *	convert IPv4 network number from presentation to network format.
 *	accepts hex octets, hex strings, decimal octets, and /CIDR.
 *	"size" is in bytes and describes "dst".
 * return:
 *	number of bits, either imputed classfully or specified with /CIDR,
 *	or -1 if some failure occurred (check errno).  ENOENT means it was
 *	not an IPv4 network specification.
 * note:
 *	network byte order assumed.  this means 192.5.5.240/28 has
 *	0x11110000 in its fourth octet.
 * author:
 *	Paul Vixie (ISC), June 1996
 */
static int
inet_net_pton_ipv4(src, dst, size)
	const char *src;
	u_char *dst;
	size_t size;
{
	static const char
		xdigits[] = "0123456789abcdef",
		digits[] = "0123456789";
	int n, ch, tmp, dirty, bits;
	const u_char *odst = dst;

	ch = *src++;
	if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
	    && isascii(src[1]) && isxdigit(src[1])) {
		/* Hexadecimal: Eat nybble string. */
		if (size <= 0)
			goto emsgsize;
		*dst = 0, dirty = 0;
		src++;	/* skip x or X. */
		while ((ch = *src++) != '\0' &&
		       isascii(ch) && isxdigit(ch)) {
			if (isupper(ch))
				ch = tolower(ch);
			n = strchr(xdigits, ch) - xdigits;
			assert(n >= 0 && n <= 15);
			*dst |= n;
			if (!dirty++)
				*dst <<= 4;
			else if (size-- > 0)
				*++dst = 0, dirty = 0;
			else
				goto emsgsize;
		}
		if (dirty)
			size--;
	} else if (isascii(ch) && isdigit(ch)) {
		/* Decimal: eat dotted digit string. */
		for (;;) {
			tmp = 0;
			do {
				n = strchr(digits, ch) - digits;
				assert(n >= 0 && n <= 9);
				tmp *= 10;
				tmp += n;
				if (tmp > 255)
					goto enoent;
			} while ((ch = *src++) != '\0' &&
				 isascii(ch) && isdigit(ch));
			if (size-- <= 0)
				goto emsgsize;
			*dst++ = (u_char) tmp;
			if (ch == '\0' || ch == '/')
				break;
			if (ch != '.')
				goto enoent;
			ch = *src++;
			if (!isascii(ch) || !isdigit(ch))
				goto enoent;
		}
	} else
		goto enoent;

	bits = -1;
	if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
		/* CIDR width specifier.  Nothing can follow it. */
		ch = *src++;	/* Skip over the /. */
		bits = 0;
		do {
			n = strchr(digits, ch) - digits;
			assert(n >= 0 && n <= 9);
			bits *= 10;
			bits += n;
		} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
		if (ch != '\0')
			goto enoent;
		if (bits > 32)
			goto emsgsize;
	}

	/* Firey death and destruction unless we prefetched EOS. */
	if (ch != '\0')
		goto enoent;

	/* If nothing was written to the destination, we found no address. */
	if (dst == odst)
		goto enoent;
	/* If no CIDR spec was given, infer width from net class. */
	if (bits == -1) {
		if (*odst >= 240)	/* Class E */
			bits = 32;
		else if (*odst >= 224)	/* Class D */
			bits = 4;
		else if (*odst >= 192)	/* Class C */
			bits = 24;
		else if (*odst >= 128)	/* Class B */
			bits = 16;
		else			/* Class A */
			bits = 8;
		/* If imputed mask is narrower than specified octets, widen. */
		if (bits >= 8 && bits < ((dst - odst) * 8))
			bits = (dst - odst) * 8;
	}
	/* Extend network to cover the actual mask. */
	while (bits > ((dst - odst) * 8)) {
		if (size-- <= 0)
			goto emsgsize;
		*dst++ = '\0';
	}
	return (bits);

 enoent:
	errno = ENOENT;
	return (-1);

 emsgsize:
	errno = EMSGSIZE;
	return (-1);
}

/*
 * Weak aliases for applications that use certain private entry points,
 * and fail to include <arpa/inet.h>.
 */
#undef inet_net_pton
__weak_reference(__inet_net_pton, inet_net_pton);
Commit	Line	Data
9385eb3d A	1	/*
	2	* Copyright (c) 1996 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 orig_rcsid[] = "From Id: inet_net_pton.c,v 1.8 1996/11/21 10:28:12 vixie Exp $";
	20	#endif
	21	#include <sys/cdefs.h>
	22	__FBSDID("$FreeBSD: src/lib/libc/net/inet_net_pton.c,v 1.8 2002/03/22 21:52:29 obrien Exp $");
	23
	24	#include <sys/types.h>
	25	#include <sys/socket.h>
	26	#include <netinet/in.h>
	27	#include <arpa/inet.h>
	28
	29	#include <assert.h>
	30	#include <ctype.h>
	31	#include <errno.h>
	32	#include <stdio.h>
	33	#include <string.h>
	34	#include <stdlib.h>
	35
	36	#ifdef SPRINTF_CHAR
	37	# define SPRINTF(x) strlen(sprintf/**/x)
	38	#else
	39	# define SPRINTF(x) ((size_t)sprintf x)
	40	#endif
	41
	42	static int inet_net_pton_ipv4(const char src, u_char dst, size_t size);
	43
	44	/*
	45	* static int
	46	* inet_net_pton(af, src, dst, size)
	47	* convert network number from presentation to network format.
	48	* accepts hex octets, hex strings, decimal octets, and /CIDR.
	49	* "size" is in bytes and describes "dst".
	50	* return:
	51	* number of bits, either imputed classfully or specified with /CIDR,
	52	* or -1 if some failure occurred (check errno). ENOENT means it was
	53	* not a valid network specification.
	54	* author:
	55	* Paul Vixie (ISC), June 1996
	56	*/
	57	int
	58	inet_net_pton(af, src, dst, size)
	59	int af;
	60	const char *src;
	61	void *dst;
	62	size_t size;
	63	{
	64	switch (af) {
65	case AF_INET:
66	return (inet_net_pton_ipv4(src, dst, size));
67	default:
68	errno = EAFNOSUPPORT;
69	return (-1);
70	}
71	}
72
73	/*
74	* static int
75	* inet_net_pton_ipv4(src, dst, size)
76	* convert IPv4 network number from presentation to network format.
77	* accepts hex octets, hex strings, decimal octets, and /CIDR.
78	* "size" is in bytes and describes "dst".
79	* return:
80	* number of bits, either imputed classfully or specified with /CIDR,
81	* or -1 if some failure occurred (check errno). ENOENT means it was
82	* not an IPv4 network specification.
83	* note:
84	* network byte order assumed. this means 192.5.5.240/28 has
85	* 0x11110000 in its fourth octet.
86	* author:
87	* Paul Vixie (ISC), June 1996
88	*/
89	static int
90	inet_net_pton_ipv4(src, dst, size)
91	const char *src;
92	u_char *dst;
93	size_t size;
94	{
95	static const char
96	xdigits[] = "0123456789abcdef",
97	digits[] = "0123456789";
98	int n, ch, tmp, dirty, bits;
99	const u_char *odst = dst;
100
101	ch = *src++;
102	if (ch == '0' && (src[0] == 'x' \|\| src[0] == 'X')
103	&& isascii(src[1]) && isxdigit(src[1])) {
104	/* Hexadecimal: Eat nybble string. */
105	if (size <= 0)
106	goto emsgsize;
107	*dst = 0, dirty = 0;
108	src++; /* skip x or X. */
109	while ((ch = *src++) != '\0' &&
110	isascii(ch) && isxdigit(ch)) {
111	if (isupper(ch))
112	ch = tolower(ch);
113	n = strchr(xdigits, ch) - xdigits;
114	assert(n >= 0 && n <= 15);
115	*dst \|= n;
116	if (!dirty++)
117	*dst <<= 4;
118	else if (size-- > 0)
119	*++dst = 0, dirty = 0;
120	else
121	goto emsgsize;
122	}
123	if (dirty)
124	size--;
125	} else if (isascii(ch) && isdigit(ch)) {
126	/* Decimal: eat dotted digit string. */
127	for (;;) {
128	tmp = 0;
129	do {
130	n = strchr(digits, ch) - digits;
131	assert(n >= 0 && n <= 9);
132	tmp *= 10;
133	tmp += n;
134	if (tmp > 255)
135	goto enoent;
136	} while ((ch = *src++) != '\0' &&
137	isascii(ch) && isdigit(ch));
138	if (size-- <= 0)
139	goto emsgsize;
140	*dst++ = (u_char) tmp;
141	if (ch == '\0' \|\| ch == '/')
142	break;
143	if (ch != '.')
144	goto enoent;
145	ch = *src++;
146	if (!isascii(ch) \|\| !isdigit(ch))
147	goto enoent;
148	}
149	} else
150	goto enoent;
151
152	bits = -1;
153	if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
154	/* CIDR width specifier. Nothing can follow it. */
155	ch = src++; / Skip over the /. */
156	bits = 0;
157	do {
158	n = strchr(digits, ch) - digits;
159	assert(n >= 0 && n <= 9);
160	bits *= 10;
161	bits += n;
162	} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
163	if (ch != '\0')
164	goto enoent;
165	if (bits > 32)
166	goto emsgsize;
167	}
168
169	/* Firey death and destruction unless we prefetched EOS. */
170	if (ch != '\0')
171	goto enoent;
172
173	/* If nothing was written to the destination, we found no address. */
174	if (dst == odst)
175	goto enoent;
176	/* If no CIDR spec was given, infer width from net class. */
177	if (bits == -1) {
178	if (odst >= 240) / Class E */
179	bits = 32;
180	else if (odst >= 224) / Class D */
181	bits = 4;
182	else if (odst >= 192) / Class C */
183	bits = 24;
184	else if (odst >= 128) / Class B */
185	bits = 16;
186	else /* Class A */
187	bits = 8;
188	/* If imputed mask is narrower than specified octets, widen. */
189	if (bits >= 8 && bits < ((dst - odst) * 8))
190	bits = (dst - odst) * 8;
191	}
192	/* Extend network to cover the actual mask. */
193	while (bits > ((dst - odst) * 8)) {
194	if (size-- <= 0)
195	goto emsgsize;
196	*dst++ = '\0';
197	}
198	return (bits);
199
200	enoent:
201	errno = ENOENT;
202	return (-1);
203
204	emsgsize:
205	errno = EMSGSIZE;
206	return (-1);
207	}
208
209	/*
210	* Weak aliases for applications that use certain private entry points,
211	* and fail to include <arpa/inet.h>.
212	*/
213	#undef inet_net_pton
214	__weak_reference(__inet_net_pton, inet_net_pton);