[thirdparty/glibc.git] / resolv / 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 rcsid[] = "$Id$";
#endif

#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 __P((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:
		__set_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;

	bits = -1;
	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;

	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;
	}

	/* 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 >= 224)
			bits = 4;
		else if (*odst >= 192)
			bits = 24;
		else if (*odst >= 128)
			bits = 16;
		else
			bits = 8;
	}
	/* Extend network to cover the actual mask. */
	while (bits > ((dst - odst) * 8)) {
		if (size-- <= 0)
			goto emsgsize;
		*dst++ = '\0';
	}
	return (bits);

 enoent:
	__set_errno (ENOENT);
	return (-1);

 emsgsize:
	__set_errno (EMSGSIZE);
	return (-1);
}
Commit	Line	Data
df21c858 UD	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 rcsid[] = "$Id$";
	20	#endif
	21
	22	#include <sys/types.h>
	23	#include <sys/socket.h>
	24	#include <netinet/in.h>
	25	#include <arpa/inet.h>
	26
	27	#include <assert.h>
	28	#include <ctype.h>
	29	#include <errno.h>
	30	#include <stdio.h>
	31	#include <string.h>
	32	#include <stdlib.h>
	33
	34	#ifdef SPRINTF_CHAR
	35	# define SPRINTF(x) strlen(sprintf/**/x)
	36	#else
	37	# define SPRINTF(x) ((size_t)sprintf x)
	38	#endif
	39
	40	static int inet_net_pton_ipv4 __P((const char src, u_char dst,
	41	size_t size));
	42
	43	/*
	44	* static int
	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".
	49	* return:
	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.
	53	* author:
	54	* Paul Vixie (ISC), June 1996
	55	*/
	56	int
	57	inet_net_pton(af, src, dst, size)
	58	int af;
	59	const char *src;
	60	void *dst;
	61	size_t size;
	62	{
	63	switch (af) {
	64	case AF_INET:
65	return (inet_net_pton_ipv4(src, dst, size));
66	default:
c4029823	67	__set_errno (EAFNOSUPPORT);
df21c858 UD	68	return (-1);
	69	}
	70	}
	71
	72	/*
	73	* static int
	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".
	78	* return:
	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.
	82	* note:
	83	* network byte order assumed. this means 192.5.5.240/28 has
	84	* 0x11110000 in its fourth octet.
	85	* author:
	86	* Paul Vixie (ISC), June 1996
	87	*/
	88	static int
	89	inet_net_pton_ipv4(src, dst, size)
	90	const char *src;
	91	u_char *dst;
	92	size_t size;
	93	{
	94	static const char
	95	xdigits[] = "0123456789abcdef",
	96	digits[] = "0123456789";
	97	int n, ch, tmp, dirty, bits;
	98	const u_char *odst = dst;
	99
	100	bits = -1;
	101	ch = *src++;
	102
	103	if (ch == '0' && (src[0] == 'x' \|\| src[0] == 'X')
	104	&& isascii(src[1]) && isxdigit(src[1])) {
	105	/* Hexadecimal: Eat nybble string. */
	106	if (size <= 0)
	107	goto emsgsize;
	108	*dst = 0, dirty = 0;
	109	src++; /* skip x or X. */
	110	while ((ch = *src++) != '\0' &&
	111	isascii(ch) && isxdigit(ch)) {
	112	if (isupper(ch))
	113	ch = tolower(ch);
	114	n = strchr(xdigits, ch) - xdigits;
	115	assert(n >= 0 && n <= 15);
	116	*dst \|= n;
	117	if (!dirty++)
	118	*dst <<= 4;
	119	else if (size-- > 0)
	120	*++dst = 0, dirty = 0;
	121	else
	122	goto emsgsize;
	123	}
	124	if (dirty)
	125	size--;
	126	} else if (isascii(ch) && isdigit(ch)) {
	127	/* Decimal: eat dotted digit string. */
	128	for (;;) {
	129	tmp = 0;
	130	do {
	131	n = strchr(digits, ch) - digits;
132	assert(n >= 0 && n <= 9);
133	tmp *= 10;
134	tmp += n;
135	if (tmp > 255)
136	goto enoent;
137	} while ((ch = *src++) != '\0' &&
138	isascii(ch) && isdigit(ch));
139	if (size-- <= 0)
140	goto emsgsize;
141	*dst++ = (u_char) tmp;
142	if (ch == '\0' \|\| ch == '/')
143	break;
144	if (ch != '.')
145	goto enoent;
146	ch = *src++;
147	if (!isascii(ch) \|\| !isdigit(ch))
148	goto enoent;
149	}
150	} else
151	goto enoent;
152
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' &&
163	isascii(ch) && isdigit(ch));
164	if (ch != '\0')
165	goto enoent;
166	}
167
168	/* Firey death and destruction unless we prefetched EOS. */
169	if (ch != '\0')
170	goto enoent;
171
172	/* If nothing was written to the destination, we found no address. */
173	if (dst == odst)
174	goto enoent;
175	/* If no CIDR spec was given, infer width from net class. */
176	if (bits == -1) {
177	if (*odst >= 224)
178	bits = 4;
179	else if (*odst >= 192)
180	bits = 24;
181	else if (*odst >= 128)
182	bits = 16;
183	else
184	bits = 8;
185	}
186	/* Extend network to cover the actual mask. */
187	while (bits > ((dst - odst) * 8)) {
188	if (size-- <= 0)
189	goto emsgsize;
190	*dst++ = '\0';
191	}
192	return (bits);
193
194	enoent:
c4029823	195	__set_errno (ENOENT);
df21c858 UD	196	return (-1);
	197
	198	emsgsize:
c4029823	199	__set_errno (EMSGSIZE);
df21c858 UD	200	return (-1);
df21c858 UD	201	}