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lwip/core/ipv4/ip_addr.c@0:281d6ff68967, 2010-11-19 (annotated)

Committer:: hexley
Date:: Fri Nov 19 01:54:45 2010 +0000
Revision:: 0:281d6ff68967

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User	Revision	Line number	New contents of line
hexley	0:281d6ff68967	1	/**
hexley	0:281d6ff68967	2	* @file
hexley	0:281d6ff68967	3	* This is the IPv4 address tools implementation.
hexley	0:281d6ff68967	4	*
hexley	0:281d6ff68967	5	*/
hexley	0:281d6ff68967	6
hexley	0:281d6ff68967	7	/*
hexley	0:281d6ff68967	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
hexley	0:281d6ff68967	9	* All rights reserved.
hexley	0:281d6ff68967	10	*
hexley	0:281d6ff68967	11	* Redistribution and use in source and binary forms, with or without modification,
hexley	0:281d6ff68967	12	* are permitted provided that the following conditions are met:
hexley	0:281d6ff68967	13	*
hexley	0:281d6ff68967	14	* 1. Redistributions of source code must retain the above copyright notice,
hexley	0:281d6ff68967	15	* this list of conditions and the following disclaimer.
hexley	0:281d6ff68967	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
hexley	0:281d6ff68967	17	* this list of conditions and the following disclaimer in the documentation
hexley	0:281d6ff68967	18	* and/or other materials provided with the distribution.
hexley	0:281d6ff68967	19	* 3. The name of the author may not be used to endorse or promote products
hexley	0:281d6ff68967	20	* derived from this software without specific prior written permission.
hexley	0:281d6ff68967	21	*
hexley	0:281d6ff68967	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hexley	0:281d6ff68967	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hexley	0:281d6ff68967	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hexley	0:281d6ff68967	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hexley	0:281d6ff68967	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hexley	0:281d6ff68967	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hexley	0:281d6ff68967	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hexley	0:281d6ff68967	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hexley	0:281d6ff68967	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hexley	0:281d6ff68967	31	* OF SUCH DAMAGE.
hexley	0:281d6ff68967	32	*
hexley	0:281d6ff68967	33	* This file is part of the lwIP TCP/IP stack.
hexley	0:281d6ff68967	34	*
hexley	0:281d6ff68967	35	* Author: Adam Dunkels <adam@sics.se>
hexley	0:281d6ff68967	36	*
hexley	0:281d6ff68967	37	*/
hexley	0:281d6ff68967	38
hexley	0:281d6ff68967	39	#include "lwip/opt.h"
hexley	0:281d6ff68967	40	#include "lwip/ip_addr.h"
hexley	0:281d6ff68967	41	#include "lwip/netif.h"
hexley	0:281d6ff68967	42
hexley	0:281d6ff68967	43	/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
hexley	0:281d6ff68967	44	const ip_addr_t ip_addr_any = { IPADDR_ANY };
hexley	0:281d6ff68967	45	const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
hexley	0:281d6ff68967	46
hexley	0:281d6ff68967	47	/**
hexley	0:281d6ff68967	48	* Determine if an address is a broadcast address on a network interface
hexley	0:281d6ff68967	49	*
hexley	0:281d6ff68967	50	* @param addr address to be checked
hexley	0:281d6ff68967	51	* @param netif the network interface against which the address is checked
hexley	0:281d6ff68967	52	* @return returns non-zero if the address is a broadcast address
hexley	0:281d6ff68967	53	*/
hexley	0:281d6ff68967	54	u8_t
hexley	0:281d6ff68967	55	ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
hexley	0:281d6ff68967	56	{
hexley	0:281d6ff68967	57	ip_addr_t ipaddr;
hexley	0:281d6ff68967	58	ip4_addr_set_u32(&ipaddr, addr);
hexley	0:281d6ff68967	59
hexley	0:281d6ff68967	60	/* all ones (broadcast) or all zeroes (old skool broadcast) */
hexley	0:281d6ff68967	61	if ((~addr == IPADDR_ANY) \|\|
hexley	0:281d6ff68967	62	(addr == IPADDR_ANY)) {
hexley	0:281d6ff68967	63	return 1;
hexley	0:281d6ff68967	64	/* no broadcast support on this network interface? */
hexley	0:281d6ff68967	65	} else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
hexley	0:281d6ff68967	66	/* the given address cannot be a broadcast address
hexley	0:281d6ff68967	67	* nor can we check against any broadcast addresses */
hexley	0:281d6ff68967	68	return 0;
hexley	0:281d6ff68967	69	/* address matches network interface address exactly? => no broadcast */
hexley	0:281d6ff68967	70	} else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
hexley	0:281d6ff68967	71	return 0;
hexley	0:281d6ff68967	72	/* on the same (sub) network... */
hexley	0:281d6ff68967	73	} else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
hexley	0:281d6ff68967	74	/* ...and host identifier bits are all ones? =>... */
hexley	0:281d6ff68967	75	&& ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
hexley	0:281d6ff68967	76	(IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
hexley	0:281d6ff68967	77	/* => network broadcast address */
hexley	0:281d6ff68967	78	return 1;
hexley	0:281d6ff68967	79	} else {
hexley	0:281d6ff68967	80	return 0;
hexley	0:281d6ff68967	81	}
hexley	0:281d6ff68967	82	}
hexley	0:281d6ff68967	83
hexley	0:281d6ff68967	84	/** Checks if a netmask is valid (starting with ones, then only zeros)
hexley	0:281d6ff68967	85	*
hexley	0:281d6ff68967	86	* @param netmask the IPv4 netmask to check (in network byte order!)
hexley	0:281d6ff68967	87	* @return 1 if the netmask is valid, 0 if it is not
hexley	0:281d6ff68967	88	*/
hexley	0:281d6ff68967	89	u8_t
hexley	0:281d6ff68967	90	ip4_addr_netmask_valid(u32_t netmask)
hexley	0:281d6ff68967	91	{
hexley	0:281d6ff68967	92	u32_t mask;
hexley	0:281d6ff68967	93	u32_t nm_hostorder = lwip_htonl(netmask);
hexley	0:281d6ff68967	94
hexley	0:281d6ff68967	95	/* first, check for the first zero */
hexley	0:281d6ff68967	96	for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
hexley	0:281d6ff68967	97	if ((nm_hostorder & mask) == 0) {
hexley	0:281d6ff68967	98	break;
hexley	0:281d6ff68967	99	}
hexley	0:281d6ff68967	100	}
hexley	0:281d6ff68967	101	/* then check that there is no one */
hexley	0:281d6ff68967	102	for (; mask != 0; mask >>= 1) {
hexley	0:281d6ff68967	103	if ((nm_hostorder & mask) != 0) {
hexley	0:281d6ff68967	104	/* there is a one after the first zero -> invalid */
hexley	0:281d6ff68967	105	return 0;
hexley	0:281d6ff68967	106	}
hexley	0:281d6ff68967	107	}
hexley	0:281d6ff68967	108	/* no one after the first zero -> valid */
hexley	0:281d6ff68967	109	return 1;
hexley	0:281d6ff68967	110	}
hexley	0:281d6ff68967	111
hexley	0:281d6ff68967	112	/* Here for now until needed in other places in lwIP */
hexley	0:281d6ff68967	113	#ifndef isprint
hexley	0:281d6ff68967	114	#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
hexley	0:281d6ff68967	115	#define isprint(c) in_range(c, 0x20, 0x7f)
hexley	0:281d6ff68967	116	#define isdigit(c) in_range(c, '0', '9')
hexley	0:281d6ff68967	117	#define isxdigit(c) (isdigit(c) \|\| in_range(c, 'a', 'f') \|\| in_range(c, 'A', 'F'))
hexley	0:281d6ff68967	118	#define islower(c) in_range(c, 'a', 'z')
hexley	0:281d6ff68967	119	#define isspace(c) (c == ' ' \|\| c == '\f' \|\| c == '\n' \|\| c == '\r' \|\| c == '\t' \|\| c == '\v')
hexley	0:281d6ff68967	120	#endif
hexley	0:281d6ff68967	121
hexley	0:281d6ff68967	122	/**
hexley	0:281d6ff68967	123	* Ascii internet address interpretation routine.
hexley	0:281d6ff68967	124	* The value returned is in network order.
hexley	0:281d6ff68967	125	*
hexley	0:281d6ff68967	126	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
hexley	0:281d6ff68967	127	* @return ip address in network order
hexley	0:281d6ff68967	128	*/
hexley	0:281d6ff68967	129	u32_t
hexley	0:281d6ff68967	130	ipaddr_addr(const char *cp)
hexley	0:281d6ff68967	131	{
hexley	0:281d6ff68967	132	ip_addr_t val;
hexley	0:281d6ff68967	133
hexley	0:281d6ff68967	134	if (ipaddr_aton(cp, &val)) {
hexley	0:281d6ff68967	135	return ip4_addr_get_u32(&val);
hexley	0:281d6ff68967	136	}
hexley	0:281d6ff68967	137	return (IPADDR_NONE);
hexley	0:281d6ff68967	138	}
hexley	0:281d6ff68967	139
hexley	0:281d6ff68967	140	/**
hexley	0:281d6ff68967	141	* Check whether "cp" is a valid ascii representation
hexley	0:281d6ff68967	142	* of an Internet address and convert to a binary address.
hexley	0:281d6ff68967	143	* Returns 1 if the address is valid, 0 if not.
hexley	0:281d6ff68967	144	* This replaces inet_addr, the return value from which
hexley	0:281d6ff68967	145	* cannot distinguish between failure and a local broadcast address.
hexley	0:281d6ff68967	146	*
hexley	0:281d6ff68967	147	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
hexley	0:281d6ff68967	148	* @param addr pointer to which to save the ip address in network order
hexley	0:281d6ff68967	149	* @return 1 if cp could be converted to addr, 0 on failure
hexley	0:281d6ff68967	150	*/
hexley	0:281d6ff68967	151	int
hexley	0:281d6ff68967	152	ipaddr_aton(const char cp, ip_addr_t addr)
hexley	0:281d6ff68967	153	{
hexley	0:281d6ff68967	154	u32_t val;
hexley	0:281d6ff68967	155	u8_t base;
hexley	0:281d6ff68967	156	char c;
hexley	0:281d6ff68967	157	u32_t parts[4];
hexley	0:281d6ff68967	158	u32_t *pp = parts;
hexley	0:281d6ff68967	159
hexley	0:281d6ff68967	160	c = *cp;
hexley	0:281d6ff68967	161	for (;;) {
hexley	0:281d6ff68967	162	/*
hexley	0:281d6ff68967	163	* Collect number up to ``.''.
hexley	0:281d6ff68967	164	* Values are specified as for C:
hexley	0:281d6ff68967	165	* 0x=hex, 0=octal, 1-9=decimal.
hexley	0:281d6ff68967	166	*/
hexley	0:281d6ff68967	167	if (!isdigit(c))
hexley	0:281d6ff68967	168	return (0);
hexley	0:281d6ff68967	169	val = 0;
hexley	0:281d6ff68967	170	base = 10;
hexley	0:281d6ff68967	171	if (c == '0') {
hexley	0:281d6ff68967	172	c = *++cp;
hexley	0:281d6ff68967	173	if (c == 'x' \|\| c == 'X') {
hexley	0:281d6ff68967	174	base = 16;
hexley	0:281d6ff68967	175	c = *++cp;
hexley	0:281d6ff68967	176	} else
hexley	0:281d6ff68967	177	base = 8;
hexley	0:281d6ff68967	178	}
hexley	0:281d6ff68967	179	for (;;) {
hexley	0:281d6ff68967	180	if (isdigit(c)) {
hexley	0:281d6ff68967	181	val = (val * base) + (int)(c - '0');
hexley	0:281d6ff68967	182	c = *++cp;
hexley	0:281d6ff68967	183	} else if (base == 16 && isxdigit(c)) {
hexley	0:281d6ff68967	184	val = (val << 4) \| (int)(c + 10 - (islower(c) ? 'a' : 'A'));
hexley	0:281d6ff68967	185	c = *++cp;
hexley	0:281d6ff68967	186	} else
hexley	0:281d6ff68967	187	break;
hexley	0:281d6ff68967	188	}
hexley	0:281d6ff68967	189	if (c == '.') {
hexley	0:281d6ff68967	190	/*
hexley	0:281d6ff68967	191	* Internet format:
hexley	0:281d6ff68967	192	* a.b.c.d
hexley	0:281d6ff68967	193	* a.b.c (with c treated as 16 bits)
hexley	0:281d6ff68967	194	* a.b (with b treated as 24 bits)
hexley	0:281d6ff68967	195	*/
hexley	0:281d6ff68967	196	if (pp >= parts + 3) {
hexley	0:281d6ff68967	197	return (0);
hexley	0:281d6ff68967	198	}
hexley	0:281d6ff68967	199	*pp++ = val;
hexley	0:281d6ff68967	200	c = *++cp;
hexley	0:281d6ff68967	201	} else
hexley	0:281d6ff68967	202	break;
hexley	0:281d6ff68967	203	}
hexley	0:281d6ff68967	204	/*
hexley	0:281d6ff68967	205	* Check for trailing characters.
hexley	0:281d6ff68967	206	*/
hexley	0:281d6ff68967	207	if (c != '\0' && !isspace(c)) {
hexley	0:281d6ff68967	208	return (0);
hexley	0:281d6ff68967	209	}
hexley	0:281d6ff68967	210	/*
hexley	0:281d6ff68967	211	* Concoct the address according to
hexley	0:281d6ff68967	212	* the number of parts specified.
hexley	0:281d6ff68967	213	*/
hexley	0:281d6ff68967	214	switch (pp - parts + 1) {
hexley	0:281d6ff68967	215
hexley	0:281d6ff68967	216	case 0:
hexley	0:281d6ff68967	217	return (0); /* initial nondigit */
hexley	0:281d6ff68967	218
hexley	0:281d6ff68967	219	case 1: /* a -- 32 bits */
hexley	0:281d6ff68967	220	break;
hexley	0:281d6ff68967	221
hexley	0:281d6ff68967	222	case 2: /* a.b -- 8.24 bits */
hexley	0:281d6ff68967	223	if (val > 0xffffffUL) {
hexley	0:281d6ff68967	224	return (0);
hexley	0:281d6ff68967	225	}
hexley	0:281d6ff68967	226	val \|= parts[0] << 24;
hexley	0:281d6ff68967	227	break;
hexley	0:281d6ff68967	228
hexley	0:281d6ff68967	229	case 3: /* a.b.c -- 8.8.16 bits */
hexley	0:281d6ff68967	230	if (val > 0xffff) {
hexley	0:281d6ff68967	231	return (0);
hexley	0:281d6ff68967	232	}
hexley	0:281d6ff68967	233	val \|= (parts[0] << 24) \| (parts[1] << 16);
hexley	0:281d6ff68967	234	break;
hexley	0:281d6ff68967	235
hexley	0:281d6ff68967	236	case 4: /* a.b.c.d -- 8.8.8.8 bits */
hexley	0:281d6ff68967	237	if (val > 0xff) {
hexley	0:281d6ff68967	238	return (0);
hexley	0:281d6ff68967	239	}
hexley	0:281d6ff68967	240	val \|= (parts[0] << 24) \| (parts[1] << 16) \| (parts[2] << 8);
hexley	0:281d6ff68967	241	break;
hexley	0:281d6ff68967	242	default:
hexley	0:281d6ff68967	243	LWIP_ASSERT("unhandled", 0);
hexley	0:281d6ff68967	244	break;
hexley	0:281d6ff68967	245	}
hexley	0:281d6ff68967	246	if (addr) {
hexley	0:281d6ff68967	247	ip4_addr_set_u32(addr, htonl(val));
hexley	0:281d6ff68967	248	}
hexley	0:281d6ff68967	249	return (1);
hexley	0:281d6ff68967	250	}
hexley	0:281d6ff68967	251
hexley	0:281d6ff68967	252	/**
hexley	0:281d6ff68967	253	* Convert numeric IP address into decimal dotted ASCII representation.
hexley	0:281d6ff68967	254	* returns ptr to static buffer; not reentrant!
hexley	0:281d6ff68967	255	*
hexley	0:281d6ff68967	256	* @param addr ip address in network order to convert
hexley	0:281d6ff68967	257	* @return pointer to a global static (!) buffer that holds the ASCII
hexley	0:281d6ff68967	258	* represenation of addr
hexley	0:281d6ff68967	259	*/
hexley	0:281d6ff68967	260	char *
hexley	0:281d6ff68967	261	ipaddr_ntoa(const ip_addr_t *addr)
hexley	0:281d6ff68967	262	{
hexley	0:281d6ff68967	263	static char str[16];
hexley	0:281d6ff68967	264	return ipaddr_ntoa_r(addr, str, 16);
hexley	0:281d6ff68967	265	}
hexley	0:281d6ff68967	266
hexley	0:281d6ff68967	267	/**
hexley	0:281d6ff68967	268	* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
hexley	0:281d6ff68967	269	*
hexley	0:281d6ff68967	270	* @param addr ip address in network order to convert
hexley	0:281d6ff68967	271	* @param buf target buffer where the string is stored
hexley	0:281d6ff68967	272	* @param buflen length of buf
hexley	0:281d6ff68967	273	* @return either pointer to buf which now holds the ASCII
hexley	0:281d6ff68967	274	* representation of addr or NULL if buf was too small
hexley	0:281d6ff68967	275	*/
hexley	0:281d6ff68967	276	char ipaddr_ntoa_r(const ip_addr_t addr, char *buf, int buflen)
hexley	0:281d6ff68967	277	{
hexley	0:281d6ff68967	278	u32_t s_addr;
hexley	0:281d6ff68967	279	char inv[3];
hexley	0:281d6ff68967	280	char *rp;
hexley	0:281d6ff68967	281	u8_t *ap;
hexley	0:281d6ff68967	282	u8_t rem;
hexley	0:281d6ff68967	283	u8_t n;
hexley	0:281d6ff68967	284	u8_t i;
hexley	0:281d6ff68967	285	int len = 0;
hexley	0:281d6ff68967	286
hexley	0:281d6ff68967	287	s_addr = ip4_addr_get_u32(addr);
hexley	0:281d6ff68967	288
hexley	0:281d6ff68967	289	rp = buf;
hexley	0:281d6ff68967	290	ap = (u8_t *)&s_addr;
hexley	0:281d6ff68967	291	for(n = 0; n < 4; n++) {
hexley	0:281d6ff68967	292	i = 0;
hexley	0:281d6ff68967	293	do {
hexley	0:281d6ff68967	294	rem = *ap % (u8_t)10;
hexley	0:281d6ff68967	295	*ap /= (u8_t)10;
hexley	0:281d6ff68967	296	inv[i++] = '0' + rem;
hexley	0:281d6ff68967	297	} while(*ap);
hexley	0:281d6ff68967	298	while(i--) {
hexley	0:281d6ff68967	299	if (len++ >= buflen) {
hexley	0:281d6ff68967	300	return NULL;
hexley	0:281d6ff68967	301	}
hexley	0:281d6ff68967	302	*rp++ = inv[i];
hexley	0:281d6ff68967	303	}
hexley	0:281d6ff68967	304	if (len++ >= buflen) {
hexley	0:281d6ff68967	305	return NULL;
hexley	0:281d6ff68967	306	}
hexley	0:281d6ff68967	307	*rp++ = '.';
hexley	0:281d6ff68967	308	ap++;
hexley	0:281d6ff68967	309	}
hexley	0:281d6ff68967	310	*--rp = 0;
hexley	0:281d6ff68967	311	return buf;
hexley	0:281d6ff68967	312	}

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Type:	Library
Created:	19 Nov 2010
Imports:	44
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

lwip/core/ipv4/ip_addr.c@0:281d6ff68967, 2010-11-19 (annotated)

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