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lwip/core/ipv4/ip_addr.c@0:dcf3c92487ca, 2011-07-20 (annotated)

Committer:: idinor
Date:: Wed Jul 20 11:45:39 2011 +0000
Revision:: 0:dcf3c92487ca

Who changed what in which revision?

User	Revision	Line number	New contents of line
idinor	0:dcf3c92487ca	1	/**
idinor	0:dcf3c92487ca	2	* @file
idinor	0:dcf3c92487ca	3	* This is the IPv4 address tools implementation.
idinor	0:dcf3c92487ca	4	*
idinor	0:dcf3c92487ca	5	*/
idinor	0:dcf3c92487ca	6
idinor	0:dcf3c92487ca	7	/*
idinor	0:dcf3c92487ca	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
idinor	0:dcf3c92487ca	9	* All rights reserved.
idinor	0:dcf3c92487ca	10	*
idinor	0:dcf3c92487ca	11	* Redistribution and use in source and binary forms, with or without modification,
idinor	0:dcf3c92487ca	12	* are permitted provided that the following conditions are met:
idinor	0:dcf3c92487ca	13	*
idinor	0:dcf3c92487ca	14	* 1. Redistributions of source code must retain the above copyright notice,
idinor	0:dcf3c92487ca	15	* this list of conditions and the following disclaimer.
idinor	0:dcf3c92487ca	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
idinor	0:dcf3c92487ca	17	* this list of conditions and the following disclaimer in the documentation
idinor	0:dcf3c92487ca	18	* and/or other materials provided with the distribution.
idinor	0:dcf3c92487ca	19	* 3. The name of the author may not be used to endorse or promote products
idinor	0:dcf3c92487ca	20	* derived from this software without specific prior written permission.
idinor	0:dcf3c92487ca	21	*
idinor	0:dcf3c92487ca	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
idinor	0:dcf3c92487ca	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
idinor	0:dcf3c92487ca	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
idinor	0:dcf3c92487ca	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
idinor	0:dcf3c92487ca	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
idinor	0:dcf3c92487ca	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
idinor	0:dcf3c92487ca	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
idinor	0:dcf3c92487ca	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
idinor	0:dcf3c92487ca	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
idinor	0:dcf3c92487ca	31	* OF SUCH DAMAGE.
idinor	0:dcf3c92487ca	32	*
idinor	0:dcf3c92487ca	33	* This file is part of the lwIP TCP/IP stack.
idinor	0:dcf3c92487ca	34	*
idinor	0:dcf3c92487ca	35	* Author: Adam Dunkels <adam@sics.se>
idinor	0:dcf3c92487ca	36	*
idinor	0:dcf3c92487ca	37	*/
idinor	0:dcf3c92487ca	38
idinor	0:dcf3c92487ca	39	#include "lwip/opt.h"
idinor	0:dcf3c92487ca	40	#include "lwip/ip_addr.h"
idinor	0:dcf3c92487ca	41	#include "lwip/netif.h"
idinor	0:dcf3c92487ca	42
idinor	0:dcf3c92487ca	43	/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
idinor	0:dcf3c92487ca	44	const ip_addr_t ip_addr_any = { IPADDR_ANY };
idinor	0:dcf3c92487ca	45	const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
idinor	0:dcf3c92487ca	46
idinor	0:dcf3c92487ca	47	/**
idinor	0:dcf3c92487ca	48	* Determine if an address is a broadcast address on a network interface
idinor	0:dcf3c92487ca	49	*
idinor	0:dcf3c92487ca	50	* @param addr address to be checked
idinor	0:dcf3c92487ca	51	* @param netif the network interface against which the address is checked
idinor	0:dcf3c92487ca	52	* @return returns non-zero if the address is a broadcast address
idinor	0:dcf3c92487ca	53	*/
idinor	0:dcf3c92487ca	54	u8_t
idinor	0:dcf3c92487ca	55	ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
idinor	0:dcf3c92487ca	56	{
idinor	0:dcf3c92487ca	57	ip_addr_t ipaddr;
idinor	0:dcf3c92487ca	58	ip4_addr_set_u32(&ipaddr, addr);
idinor	0:dcf3c92487ca	59
idinor	0:dcf3c92487ca	60	/* all ones (broadcast) or all zeroes (old skool broadcast) */
idinor	0:dcf3c92487ca	61	if ((~addr == IPADDR_ANY) \|\|
idinor	0:dcf3c92487ca	62	(addr == IPADDR_ANY)) {
idinor	0:dcf3c92487ca	63	return 1;
idinor	0:dcf3c92487ca	64	/* no broadcast support on this network interface? */
idinor	0:dcf3c92487ca	65	} else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
idinor	0:dcf3c92487ca	66	/* the given address cannot be a broadcast address
idinor	0:dcf3c92487ca	67	* nor can we check against any broadcast addresses */
idinor	0:dcf3c92487ca	68	return 0;
idinor	0:dcf3c92487ca	69	/* address matches network interface address exactly? => no broadcast */
idinor	0:dcf3c92487ca	70	} else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
idinor	0:dcf3c92487ca	71	return 0;
idinor	0:dcf3c92487ca	72	/* on the same (sub) network... */
idinor	0:dcf3c92487ca	73	} else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
idinor	0:dcf3c92487ca	74	/* ...and host identifier bits are all ones? =>... */
idinor	0:dcf3c92487ca	75	&& ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
idinor	0:dcf3c92487ca	76	(IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
idinor	0:dcf3c92487ca	77	/* => network broadcast address */
idinor	0:dcf3c92487ca	78	return 1;
idinor	0:dcf3c92487ca	79	} else {
idinor	0:dcf3c92487ca	80	return 0;
idinor	0:dcf3c92487ca	81	}
idinor	0:dcf3c92487ca	82	}
idinor	0:dcf3c92487ca	83
idinor	0:dcf3c92487ca	84	/** Checks if a netmask is valid (starting with ones, then only zeros)
idinor	0:dcf3c92487ca	85	*
idinor	0:dcf3c92487ca	86	* @param netmask the IPv4 netmask to check (in network byte order!)
idinor	0:dcf3c92487ca	87	* @return 1 if the netmask is valid, 0 if it is not
idinor	0:dcf3c92487ca	88	*/
idinor	0:dcf3c92487ca	89	u8_t
idinor	0:dcf3c92487ca	90	ip4_addr_netmask_valid(u32_t netmask)
idinor	0:dcf3c92487ca	91	{
idinor	0:dcf3c92487ca	92	u32_t mask;
idinor	0:dcf3c92487ca	93	u32_t nm_hostorder = lwip_htonl(netmask);
idinor	0:dcf3c92487ca	94
idinor	0:dcf3c92487ca	95	/* first, check for the first zero */
idinor	0:dcf3c92487ca	96	for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
idinor	0:dcf3c92487ca	97	if ((nm_hostorder & mask) == 0) {
idinor	0:dcf3c92487ca	98	break;
idinor	0:dcf3c92487ca	99	}
idinor	0:dcf3c92487ca	100	}
idinor	0:dcf3c92487ca	101	/* then check that there is no one */
idinor	0:dcf3c92487ca	102	for (; mask != 0; mask >>= 1) {
idinor	0:dcf3c92487ca	103	if ((nm_hostorder & mask) != 0) {
idinor	0:dcf3c92487ca	104	/* there is a one after the first zero -> invalid */
idinor	0:dcf3c92487ca	105	return 0;
idinor	0:dcf3c92487ca	106	}
idinor	0:dcf3c92487ca	107	}
idinor	0:dcf3c92487ca	108	/* no one after the first zero -> valid */
idinor	0:dcf3c92487ca	109	return 1;
idinor	0:dcf3c92487ca	110	}
idinor	0:dcf3c92487ca	111
idinor	0:dcf3c92487ca	112	/* Here for now until needed in other places in lwIP */
idinor	0:dcf3c92487ca	113	#ifndef isprint
idinor	0:dcf3c92487ca	114	#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
idinor	0:dcf3c92487ca	115	#define isprint(c) in_range(c, 0x20, 0x7f)
idinor	0:dcf3c92487ca	116	#define isdigit(c) in_range(c, '0', '9')
idinor	0:dcf3c92487ca	117	#define isxdigit(c) (isdigit(c) \|\| in_range(c, 'a', 'f') \|\| in_range(c, 'A', 'F'))
idinor	0:dcf3c92487ca	118	#define islower(c) in_range(c, 'a', 'z')
idinor	0:dcf3c92487ca	119	#define isspace(c) (c == ' ' \|\| c == '\f' \|\| c == '\n' \|\| c == '\r' \|\| c == '\t' \|\| c == '\v')
idinor	0:dcf3c92487ca	120	#endif
idinor	0:dcf3c92487ca	121
idinor	0:dcf3c92487ca	122	/**
idinor	0:dcf3c92487ca	123	* Ascii internet address interpretation routine.
idinor	0:dcf3c92487ca	124	* The value returned is in network order.
idinor	0:dcf3c92487ca	125	*
idinor	0:dcf3c92487ca	126	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
idinor	0:dcf3c92487ca	127	* @return ip address in network order
idinor	0:dcf3c92487ca	128	*/
idinor	0:dcf3c92487ca	129	u32_t
idinor	0:dcf3c92487ca	130	ipaddr_addr(const char *cp)
idinor	0:dcf3c92487ca	131	{
idinor	0:dcf3c92487ca	132	ip_addr_t val;
idinor	0:dcf3c92487ca	133
idinor	0:dcf3c92487ca	134	if (ipaddr_aton(cp, &val)) {
idinor	0:dcf3c92487ca	135	return ip4_addr_get_u32(&val);
idinor	0:dcf3c92487ca	136	}
idinor	0:dcf3c92487ca	137	return (IPADDR_NONE);
idinor	0:dcf3c92487ca	138	}
idinor	0:dcf3c92487ca	139
idinor	0:dcf3c92487ca	140	/**
idinor	0:dcf3c92487ca	141	* Check whether "cp" is a valid ascii representation
idinor	0:dcf3c92487ca	142	* of an Internet address and convert to a binary address.
idinor	0:dcf3c92487ca	143	* Returns 1 if the address is valid, 0 if not.
idinor	0:dcf3c92487ca	144	* This replaces inet_addr, the return value from which
idinor	0:dcf3c92487ca	145	* cannot distinguish between failure and a local broadcast address.
idinor	0:dcf3c92487ca	146	*
idinor	0:dcf3c92487ca	147	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
idinor	0:dcf3c92487ca	148	* @param addr pointer to which to save the ip address in network order
idinor	0:dcf3c92487ca	149	* @return 1 if cp could be converted to addr, 0 on failure
idinor	0:dcf3c92487ca	150	*/
idinor	0:dcf3c92487ca	151	int
idinor	0:dcf3c92487ca	152	ipaddr_aton(const char cp, ip_addr_t addr)
idinor	0:dcf3c92487ca	153	{
idinor	0:dcf3c92487ca	154	u32_t val;
idinor	0:dcf3c92487ca	155	u8_t base;
idinor	0:dcf3c92487ca	156	char c;
idinor	0:dcf3c92487ca	157	u32_t parts[4];
idinor	0:dcf3c92487ca	158	u32_t *pp = parts;
idinor	0:dcf3c92487ca	159
idinor	0:dcf3c92487ca	160	c = *cp;
idinor	0:dcf3c92487ca	161	for (;;) {
idinor	0:dcf3c92487ca	162	/*
idinor	0:dcf3c92487ca	163	* Collect number up to ``.''.
idinor	0:dcf3c92487ca	164	* Values are specified as for C:
idinor	0:dcf3c92487ca	165	* 0x=hex, 0=octal, 1-9=decimal.
idinor	0:dcf3c92487ca	166	*/
idinor	0:dcf3c92487ca	167	if (!isdigit(c))
idinor	0:dcf3c92487ca	168	return (0);
idinor	0:dcf3c92487ca	169	val = 0;
idinor	0:dcf3c92487ca	170	base = 10;
idinor	0:dcf3c92487ca	171	if (c == '0') {
idinor	0:dcf3c92487ca	172	c = *++cp;
idinor	0:dcf3c92487ca	173	if (c == 'x' \|\| c == 'X') {
idinor	0:dcf3c92487ca	174	base = 16;
idinor	0:dcf3c92487ca	175	c = *++cp;
idinor	0:dcf3c92487ca	176	} else
idinor	0:dcf3c92487ca	177	base = 8;
idinor	0:dcf3c92487ca	178	}
idinor	0:dcf3c92487ca	179	for (;;) {
idinor	0:dcf3c92487ca	180	if (isdigit(c)) {
idinor	0:dcf3c92487ca	181	val = (val * base) + (int)(c - '0');
idinor	0:dcf3c92487ca	182	c = *++cp;
idinor	0:dcf3c92487ca	183	} else if (base == 16 && isxdigit(c)) {
idinor	0:dcf3c92487ca	184	val = (val << 4) \| (int)(c + 10 - (islower(c) ? 'a' : 'A'));
idinor	0:dcf3c92487ca	185	c = *++cp;
idinor	0:dcf3c92487ca	186	} else
idinor	0:dcf3c92487ca	187	break;
idinor	0:dcf3c92487ca	188	}
idinor	0:dcf3c92487ca	189	if (c == '.') {
idinor	0:dcf3c92487ca	190	/*
idinor	0:dcf3c92487ca	191	* Internet format:
idinor	0:dcf3c92487ca	192	* a.b.c.d
idinor	0:dcf3c92487ca	193	* a.b.c (with c treated as 16 bits)
idinor	0:dcf3c92487ca	194	* a.b (with b treated as 24 bits)
idinor	0:dcf3c92487ca	195	*/
idinor	0:dcf3c92487ca	196	if (pp >= parts + 3) {
idinor	0:dcf3c92487ca	197	return (0);
idinor	0:dcf3c92487ca	198	}
idinor	0:dcf3c92487ca	199	*pp++ = val;
idinor	0:dcf3c92487ca	200	c = *++cp;
idinor	0:dcf3c92487ca	201	} else
idinor	0:dcf3c92487ca	202	break;
idinor	0:dcf3c92487ca	203	}
idinor	0:dcf3c92487ca	204	/*
idinor	0:dcf3c92487ca	205	* Check for trailing characters.
idinor	0:dcf3c92487ca	206	*/
idinor	0:dcf3c92487ca	207	if (c != '\0' && !isspace(c)) {
idinor	0:dcf3c92487ca	208	return (0);
idinor	0:dcf3c92487ca	209	}
idinor	0:dcf3c92487ca	210	/*
idinor	0:dcf3c92487ca	211	* Concoct the address according to
idinor	0:dcf3c92487ca	212	* the number of parts specified.
idinor	0:dcf3c92487ca	213	*/
idinor	0:dcf3c92487ca	214	switch (pp - parts + 1) {
idinor	0:dcf3c92487ca	215
idinor	0:dcf3c92487ca	216	case 0:
idinor	0:dcf3c92487ca	217	return (0); /* initial nondigit */
idinor	0:dcf3c92487ca	218
idinor	0:dcf3c92487ca	219	case 1: /* a -- 32 bits */
idinor	0:dcf3c92487ca	220	break;
idinor	0:dcf3c92487ca	221
idinor	0:dcf3c92487ca	222	case 2: /* a.b -- 8.24 bits */
idinor	0:dcf3c92487ca	223	if (val > 0xffffffUL) {
idinor	0:dcf3c92487ca	224	return (0);
idinor	0:dcf3c92487ca	225	}
idinor	0:dcf3c92487ca	226	val \|= parts[0] << 24;
idinor	0:dcf3c92487ca	227	break;
idinor	0:dcf3c92487ca	228
idinor	0:dcf3c92487ca	229	case 3: /* a.b.c -- 8.8.16 bits */
idinor	0:dcf3c92487ca	230	if (val > 0xffff) {
idinor	0:dcf3c92487ca	231	return (0);
idinor	0:dcf3c92487ca	232	}
idinor	0:dcf3c92487ca	233	val \|= (parts[0] << 24) \| (parts[1] << 16);
idinor	0:dcf3c92487ca	234	break;
idinor	0:dcf3c92487ca	235
idinor	0:dcf3c92487ca	236	case 4: /* a.b.c.d -- 8.8.8.8 bits */
idinor	0:dcf3c92487ca	237	if (val > 0xff) {
idinor	0:dcf3c92487ca	238	return (0);
idinor	0:dcf3c92487ca	239	}
idinor	0:dcf3c92487ca	240	val \|= (parts[0] << 24) \| (parts[1] << 16) \| (parts[2] << 8);
idinor	0:dcf3c92487ca	241	break;
idinor	0:dcf3c92487ca	242	default:
idinor	0:dcf3c92487ca	243	LWIP_ASSERT("unhandled", 0);
idinor	0:dcf3c92487ca	244	break;
idinor	0:dcf3c92487ca	245	}
idinor	0:dcf3c92487ca	246	if (addr) {
idinor	0:dcf3c92487ca	247	ip4_addr_set_u32(addr, htonl(val));
idinor	0:dcf3c92487ca	248	}
idinor	0:dcf3c92487ca	249	return (1);
idinor	0:dcf3c92487ca	250	}
idinor	0:dcf3c92487ca	251
idinor	0:dcf3c92487ca	252	/**
idinor	0:dcf3c92487ca	253	* Convert numeric IP address into decimal dotted ASCII representation.
idinor	0:dcf3c92487ca	254	* returns ptr to static buffer; not reentrant!
idinor	0:dcf3c92487ca	255	*
idinor	0:dcf3c92487ca	256	* @param addr ip address in network order to convert
idinor	0:dcf3c92487ca	257	* @return pointer to a global static (!) buffer that holds the ASCII
idinor	0:dcf3c92487ca	258	* represenation of addr
idinor	0:dcf3c92487ca	259	*/
idinor	0:dcf3c92487ca	260	char *
idinor	0:dcf3c92487ca	261	ipaddr_ntoa(const ip_addr_t *addr)
idinor	0:dcf3c92487ca	262	{
idinor	0:dcf3c92487ca	263	static char str[16];
idinor	0:dcf3c92487ca	264	return ipaddr_ntoa_r(addr, str, 16);
idinor	0:dcf3c92487ca	265	}
idinor	0:dcf3c92487ca	266
idinor	0:dcf3c92487ca	267	/**
idinor	0:dcf3c92487ca	268	* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
idinor	0:dcf3c92487ca	269	*
idinor	0:dcf3c92487ca	270	* @param addr ip address in network order to convert
idinor	0:dcf3c92487ca	271	* @param buf target buffer where the string is stored
idinor	0:dcf3c92487ca	272	* @param buflen length of buf
idinor	0:dcf3c92487ca	273	* @return either pointer to buf which now holds the ASCII
idinor	0:dcf3c92487ca	274	* representation of addr or NULL if buf was too small
idinor	0:dcf3c92487ca	275	*/
idinor	0:dcf3c92487ca	276	char ipaddr_ntoa_r(const ip_addr_t addr, char *buf, int buflen)
idinor	0:dcf3c92487ca	277	{
idinor	0:dcf3c92487ca	278	u32_t s_addr;
idinor	0:dcf3c92487ca	279	char inv[3];
idinor	0:dcf3c92487ca	280	char *rp;
idinor	0:dcf3c92487ca	281	u8_t *ap;
idinor	0:dcf3c92487ca	282	u8_t rem;
idinor	0:dcf3c92487ca	283	u8_t n;
idinor	0:dcf3c92487ca	284	u8_t i;
idinor	0:dcf3c92487ca	285	int len = 0;
idinor	0:dcf3c92487ca	286
idinor	0:dcf3c92487ca	287	s_addr = ip4_addr_get_u32(addr);
idinor	0:dcf3c92487ca	288
idinor	0:dcf3c92487ca	289	rp = buf;
idinor	0:dcf3c92487ca	290	ap = (u8_t *)&s_addr;
idinor	0:dcf3c92487ca	291	for(n = 0; n < 4; n++) {
idinor	0:dcf3c92487ca	292	i = 0;
idinor	0:dcf3c92487ca	293	do {
idinor	0:dcf3c92487ca	294	rem = *ap % (u8_t)10;
idinor	0:dcf3c92487ca	295	*ap /= (u8_t)10;
idinor	0:dcf3c92487ca	296	inv[i++] = '0' + rem;
idinor	0:dcf3c92487ca	297	} while(*ap);
idinor	0:dcf3c92487ca	298	while(i--) {
idinor	0:dcf3c92487ca	299	if (len++ >= buflen) {
idinor	0:dcf3c92487ca	300	return NULL;
idinor	0:dcf3c92487ca	301	}
idinor	0:dcf3c92487ca	302	*rp++ = inv[i];
idinor	0:dcf3c92487ca	303	}
idinor	0:dcf3c92487ca	304	if (len++ >= buflen) {
idinor	0:dcf3c92487ca	305	return NULL;
idinor	0:dcf3c92487ca	306	}
idinor	0:dcf3c92487ca	307	*rp++ = '.';
idinor	0:dcf3c92487ca	308	ap++;
idinor	0:dcf3c92487ca	309	}
idinor	0:dcf3c92487ca	310	*--rp = 0;
idinor	0:dcf3c92487ca	311	return buf;
idinor	0:dcf3c92487ca	312	}

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Type:	Library
Created:	20 Jul 2011
Imports:	35
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	1

lwip/core/ipv4/ip_addr.c@0:dcf3c92487ca, 2011-07-20 (annotated)

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