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lwip/core/ipv4/ip_addr.c@0:ac1725ba162c, 2010-11-09 (annotated)

Committer:: segundo
Date:: Tue Nov 09 20:54:15 2010 +0000
Revision:: 0:ac1725ba162c

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User	Revision	Line number	New contents of line
segundo	0:ac1725ba162c	1	/**
segundo	0:ac1725ba162c	2	* @file
segundo	0:ac1725ba162c	3	* This is the IPv4 address tools implementation.
segundo	0:ac1725ba162c	4	*
segundo	0:ac1725ba162c	5	*/
segundo	0:ac1725ba162c	6
segundo	0:ac1725ba162c	7	/*
segundo	0:ac1725ba162c	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
segundo	0:ac1725ba162c	9	* All rights reserved.
segundo	0:ac1725ba162c	10	*
segundo	0:ac1725ba162c	11	* Redistribution and use in source and binary forms, with or without modification,
segundo	0:ac1725ba162c	12	* are permitted provided that the following conditions are met:
segundo	0:ac1725ba162c	13	*
segundo	0:ac1725ba162c	14	* 1. Redistributions of source code must retain the above copyright notice,
segundo	0:ac1725ba162c	15	* this list of conditions and the following disclaimer.
segundo	0:ac1725ba162c	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
segundo	0:ac1725ba162c	17	* this list of conditions and the following disclaimer in the documentation
segundo	0:ac1725ba162c	18	* and/or other materials provided with the distribution.
segundo	0:ac1725ba162c	19	* 3. The name of the author may not be used to endorse or promote products
segundo	0:ac1725ba162c	20	* derived from this software without specific prior written permission.
segundo	0:ac1725ba162c	21	*
segundo	0:ac1725ba162c	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
segundo	0:ac1725ba162c	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
segundo	0:ac1725ba162c	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
segundo	0:ac1725ba162c	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
segundo	0:ac1725ba162c	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
segundo	0:ac1725ba162c	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
segundo	0:ac1725ba162c	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
segundo	0:ac1725ba162c	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
segundo	0:ac1725ba162c	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
segundo	0:ac1725ba162c	31	* OF SUCH DAMAGE.
segundo	0:ac1725ba162c	32	*
segundo	0:ac1725ba162c	33	* This file is part of the lwIP TCP/IP stack.
segundo	0:ac1725ba162c	34	*
segundo	0:ac1725ba162c	35	* Author: Adam Dunkels <adam@sics.se>
segundo	0:ac1725ba162c	36	*
segundo	0:ac1725ba162c	37	*/
segundo	0:ac1725ba162c	38
segundo	0:ac1725ba162c	39	#include "lwip/opt.h"
segundo	0:ac1725ba162c	40	#include "lwip/ip_addr.h"
segundo	0:ac1725ba162c	41	#include "lwip/netif.h"
segundo	0:ac1725ba162c	42
segundo	0:ac1725ba162c	43	/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
segundo	0:ac1725ba162c	44	const ip_addr_t ip_addr_any = { IPADDR_ANY };
segundo	0:ac1725ba162c	45	const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
segundo	0:ac1725ba162c	46
segundo	0:ac1725ba162c	47	/**
segundo	0:ac1725ba162c	48	* Determine if an address is a broadcast address on a network interface
segundo	0:ac1725ba162c	49	*
segundo	0:ac1725ba162c	50	* @param addr address to be checked
segundo	0:ac1725ba162c	51	* @param netif the network interface against which the address is checked
segundo	0:ac1725ba162c	52	* @return returns non-zero if the address is a broadcast address
segundo	0:ac1725ba162c	53	*/
segundo	0:ac1725ba162c	54	u8_t
segundo	0:ac1725ba162c	55	ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
segundo	0:ac1725ba162c	56	{
segundo	0:ac1725ba162c	57	ip_addr_t ipaddr;
segundo	0:ac1725ba162c	58	ip4_addr_set_u32(&ipaddr, addr);
segundo	0:ac1725ba162c	59
segundo	0:ac1725ba162c	60	/* all ones (broadcast) or all zeroes (old skool broadcast) */
segundo	0:ac1725ba162c	61	if ((~addr == IPADDR_ANY) \|\|
segundo	0:ac1725ba162c	62	(addr == IPADDR_ANY)) {
segundo	0:ac1725ba162c	63	return 1;
segundo	0:ac1725ba162c	64	/* no broadcast support on this network interface? */
segundo	0:ac1725ba162c	65	} else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
segundo	0:ac1725ba162c	66	/* the given address cannot be a broadcast address
segundo	0:ac1725ba162c	67	* nor can we check against any broadcast addresses */
segundo	0:ac1725ba162c	68	return 0;
segundo	0:ac1725ba162c	69	/* address matches network interface address exactly? => no broadcast */
segundo	0:ac1725ba162c	70	} else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
segundo	0:ac1725ba162c	71	return 0;
segundo	0:ac1725ba162c	72	/* on the same (sub) network... */
segundo	0:ac1725ba162c	73	} else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
segundo	0:ac1725ba162c	74	/* ...and host identifier bits are all ones? =>... */
segundo	0:ac1725ba162c	75	&& ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
segundo	0:ac1725ba162c	76	(IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
segundo	0:ac1725ba162c	77	/* => network broadcast address */
segundo	0:ac1725ba162c	78	return 1;
segundo	0:ac1725ba162c	79	} else {
segundo	0:ac1725ba162c	80	return 0;
segundo	0:ac1725ba162c	81	}
segundo	0:ac1725ba162c	82	}
segundo	0:ac1725ba162c	83
segundo	0:ac1725ba162c	84	/** Checks if a netmask is valid (starting with ones, then only zeros)
segundo	0:ac1725ba162c	85	*
segundo	0:ac1725ba162c	86	* @param netmask the IPv4 netmask to check (in network byte order!)
segundo	0:ac1725ba162c	87	* @return 1 if the netmask is valid, 0 if it is not
segundo	0:ac1725ba162c	88	*/
segundo	0:ac1725ba162c	89	u8_t
segundo	0:ac1725ba162c	90	ip4_addr_netmask_valid(u32_t netmask)
segundo	0:ac1725ba162c	91	{
segundo	0:ac1725ba162c	92	u32_t mask;
segundo	0:ac1725ba162c	93	u32_t nm_hostorder = lwip_htonl(netmask);
segundo	0:ac1725ba162c	94
segundo	0:ac1725ba162c	95	/* first, check for the first zero */
segundo	0:ac1725ba162c	96	for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
segundo	0:ac1725ba162c	97	if ((nm_hostorder & mask) == 0) {
segundo	0:ac1725ba162c	98	break;
segundo	0:ac1725ba162c	99	}
segundo	0:ac1725ba162c	100	}
segundo	0:ac1725ba162c	101	/* then check that there is no one */
segundo	0:ac1725ba162c	102	for (; mask != 0; mask >>= 1) {
segundo	0:ac1725ba162c	103	if ((nm_hostorder & mask) != 0) {
segundo	0:ac1725ba162c	104	/* there is a one after the first zero -> invalid */
segundo	0:ac1725ba162c	105	return 0;
segundo	0:ac1725ba162c	106	}
segundo	0:ac1725ba162c	107	}
segundo	0:ac1725ba162c	108	/* no one after the first zero -> valid */
segundo	0:ac1725ba162c	109	return 1;
segundo	0:ac1725ba162c	110	}
segundo	0:ac1725ba162c	111
segundo	0:ac1725ba162c	112	/* Here for now until needed in other places in lwIP */
segundo	0:ac1725ba162c	113	#ifndef isprint
segundo	0:ac1725ba162c	114	#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
segundo	0:ac1725ba162c	115	#define isprint(c) in_range(c, 0x20, 0x7f)
segundo	0:ac1725ba162c	116	#define isdigit(c) in_range(c, '0', '9')
segundo	0:ac1725ba162c	117	#define isxdigit(c) (isdigit(c) \|\| in_range(c, 'a', 'f') \|\| in_range(c, 'A', 'F'))
segundo	0:ac1725ba162c	118	#define islower(c) in_range(c, 'a', 'z')
segundo	0:ac1725ba162c	119	#define isspace(c) (c == ' ' \|\| c == '\f' \|\| c == '\n' \|\| c == '\r' \|\| c == '\t' \|\| c == '\v')
segundo	0:ac1725ba162c	120	#endif
segundo	0:ac1725ba162c	121
segundo	0:ac1725ba162c	122	/**
segundo	0:ac1725ba162c	123	* Ascii internet address interpretation routine.
segundo	0:ac1725ba162c	124	* The value returned is in network order.
segundo	0:ac1725ba162c	125	*
segundo	0:ac1725ba162c	126	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
segundo	0:ac1725ba162c	127	* @return ip address in network order
segundo	0:ac1725ba162c	128	*/
segundo	0:ac1725ba162c	129	u32_t
segundo	0:ac1725ba162c	130	ipaddr_addr(const char *cp)
segundo	0:ac1725ba162c	131	{
segundo	0:ac1725ba162c	132	ip_addr_t val;
segundo	0:ac1725ba162c	133
segundo	0:ac1725ba162c	134	if (ipaddr_aton(cp, &val)) {
segundo	0:ac1725ba162c	135	return ip4_addr_get_u32(&val);
segundo	0:ac1725ba162c	136	}
segundo	0:ac1725ba162c	137	return (IPADDR_NONE);
segundo	0:ac1725ba162c	138	}
segundo	0:ac1725ba162c	139
segundo	0:ac1725ba162c	140	/**
segundo	0:ac1725ba162c	141	* Check whether "cp" is a valid ascii representation
segundo	0:ac1725ba162c	142	* of an Internet address and convert to a binary address.
segundo	0:ac1725ba162c	143	* Returns 1 if the address is valid, 0 if not.
segundo	0:ac1725ba162c	144	* This replaces inet_addr, the return value from which
segundo	0:ac1725ba162c	145	* cannot distinguish between failure and a local broadcast address.
segundo	0:ac1725ba162c	146	*
segundo	0:ac1725ba162c	147	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
segundo	0:ac1725ba162c	148	* @param addr pointer to which to save the ip address in network order
segundo	0:ac1725ba162c	149	* @return 1 if cp could be converted to addr, 0 on failure
segundo	0:ac1725ba162c	150	*/
segundo	0:ac1725ba162c	151	int
segundo	0:ac1725ba162c	152	ipaddr_aton(const char cp, ip_addr_t addr)
segundo	0:ac1725ba162c	153	{
segundo	0:ac1725ba162c	154	u32_t val;
segundo	0:ac1725ba162c	155	u8_t base;
segundo	0:ac1725ba162c	156	char c;
segundo	0:ac1725ba162c	157	u32_t parts[4];
segundo	0:ac1725ba162c	158	u32_t *pp = parts;
segundo	0:ac1725ba162c	159
segundo	0:ac1725ba162c	160	c = *cp;
segundo	0:ac1725ba162c	161	for (;;) {
segundo	0:ac1725ba162c	162	/*
segundo	0:ac1725ba162c	163	* Collect number up to ``.''.
segundo	0:ac1725ba162c	164	* Values are specified as for C:
segundo	0:ac1725ba162c	165	* 0x=hex, 0=octal, 1-9=decimal.
segundo	0:ac1725ba162c	166	*/
segundo	0:ac1725ba162c	167	if (!isdigit(c))
segundo	0:ac1725ba162c	168	return (0);
segundo	0:ac1725ba162c	169	val = 0;
segundo	0:ac1725ba162c	170	base = 10;
segundo	0:ac1725ba162c	171	if (c == '0') {
segundo	0:ac1725ba162c	172	c = *++cp;
segundo	0:ac1725ba162c	173	if (c == 'x' \|\| c == 'X') {
segundo	0:ac1725ba162c	174	base = 16;
segundo	0:ac1725ba162c	175	c = *++cp;
segundo	0:ac1725ba162c	176	} else
segundo	0:ac1725ba162c	177	base = 8;
segundo	0:ac1725ba162c	178	}
segundo	0:ac1725ba162c	179	for (;;) {
segundo	0:ac1725ba162c	180	if (isdigit(c)) {
segundo	0:ac1725ba162c	181	val = (val * base) + (int)(c - '0');
segundo	0:ac1725ba162c	182	c = *++cp;
segundo	0:ac1725ba162c	183	} else if (base == 16 && isxdigit(c)) {
segundo	0:ac1725ba162c	184	val = (val << 4) \| (int)(c + 10 - (islower(c) ? 'a' : 'A'));
segundo	0:ac1725ba162c	185	c = *++cp;
segundo	0:ac1725ba162c	186	} else
segundo	0:ac1725ba162c	187	break;
segundo	0:ac1725ba162c	188	}
segundo	0:ac1725ba162c	189	if (c == '.') {
segundo	0:ac1725ba162c	190	/*
segundo	0:ac1725ba162c	191	* Internet format:
segundo	0:ac1725ba162c	192	* a.b.c.d
segundo	0:ac1725ba162c	193	* a.b.c (with c treated as 16 bits)
segundo	0:ac1725ba162c	194	* a.b (with b treated as 24 bits)
segundo	0:ac1725ba162c	195	*/
segundo	0:ac1725ba162c	196	if (pp >= parts + 3) {
segundo	0:ac1725ba162c	197	return (0);
segundo	0:ac1725ba162c	198	}
segundo	0:ac1725ba162c	199	*pp++ = val;
segundo	0:ac1725ba162c	200	c = *++cp;
segundo	0:ac1725ba162c	201	} else
segundo	0:ac1725ba162c	202	break;
segundo	0:ac1725ba162c	203	}
segundo	0:ac1725ba162c	204	/*
segundo	0:ac1725ba162c	205	* Check for trailing characters.
segundo	0:ac1725ba162c	206	*/
segundo	0:ac1725ba162c	207	if (c != '\0' && !isspace(c)) {
segundo	0:ac1725ba162c	208	return (0);
segundo	0:ac1725ba162c	209	}
segundo	0:ac1725ba162c	210	/*
segundo	0:ac1725ba162c	211	* Concoct the address according to
segundo	0:ac1725ba162c	212	* the number of parts specified.
segundo	0:ac1725ba162c	213	*/
segundo	0:ac1725ba162c	214	switch (pp - parts + 1) {
segundo	0:ac1725ba162c	215
segundo	0:ac1725ba162c	216	case 0:
segundo	0:ac1725ba162c	217	return (0); /* initial nondigit */
segundo	0:ac1725ba162c	218
segundo	0:ac1725ba162c	219	case 1: /* a -- 32 bits */
segundo	0:ac1725ba162c	220	break;
segundo	0:ac1725ba162c	221
segundo	0:ac1725ba162c	222	case 2: /* a.b -- 8.24 bits */
segundo	0:ac1725ba162c	223	if (val > 0xffffffUL) {
segundo	0:ac1725ba162c	224	return (0);
segundo	0:ac1725ba162c	225	}
segundo	0:ac1725ba162c	226	val \|= parts[0] << 24;
segundo	0:ac1725ba162c	227	break;
segundo	0:ac1725ba162c	228
segundo	0:ac1725ba162c	229	case 3: /* a.b.c -- 8.8.16 bits */
segundo	0:ac1725ba162c	230	if (val > 0xffff) {
segundo	0:ac1725ba162c	231	return (0);
segundo	0:ac1725ba162c	232	}
segundo	0:ac1725ba162c	233	val \|= (parts[0] << 24) \| (parts[1] << 16);
segundo	0:ac1725ba162c	234	break;
segundo	0:ac1725ba162c	235
segundo	0:ac1725ba162c	236	case 4: /* a.b.c.d -- 8.8.8.8 bits */
segundo	0:ac1725ba162c	237	if (val > 0xff) {
segundo	0:ac1725ba162c	238	return (0);
segundo	0:ac1725ba162c	239	}
segundo	0:ac1725ba162c	240	val \|= (parts[0] << 24) \| (parts[1] << 16) \| (parts[2] << 8);
segundo	0:ac1725ba162c	241	break;
segundo	0:ac1725ba162c	242	default:
segundo	0:ac1725ba162c	243	LWIP_ASSERT("unhandled", 0);
segundo	0:ac1725ba162c	244	break;
segundo	0:ac1725ba162c	245	}
segundo	0:ac1725ba162c	246	if (addr) {
segundo	0:ac1725ba162c	247	ip4_addr_set_u32(addr, htonl(val));
segundo	0:ac1725ba162c	248	}
segundo	0:ac1725ba162c	249	return (1);
segundo	0:ac1725ba162c	250	}
segundo	0:ac1725ba162c	251
segundo	0:ac1725ba162c	252	/**
segundo	0:ac1725ba162c	253	* Convert numeric IP address into decimal dotted ASCII representation.
segundo	0:ac1725ba162c	254	* returns ptr to static buffer; not reentrant!
segundo	0:ac1725ba162c	255	*
segundo	0:ac1725ba162c	256	* @param addr ip address in network order to convert
segundo	0:ac1725ba162c	257	* @return pointer to a global static (!) buffer that holds the ASCII
segundo	0:ac1725ba162c	258	* represenation of addr
segundo	0:ac1725ba162c	259	*/
segundo	0:ac1725ba162c	260	char *
segundo	0:ac1725ba162c	261	ipaddr_ntoa(const ip_addr_t *addr)
segundo	0:ac1725ba162c	262	{
segundo	0:ac1725ba162c	263	static char str[16];
segundo	0:ac1725ba162c	264	return ipaddr_ntoa_r(addr, str, 16);
segundo	0:ac1725ba162c	265	}
segundo	0:ac1725ba162c	266
segundo	0:ac1725ba162c	267	/**
segundo	0:ac1725ba162c	268	* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
segundo	0:ac1725ba162c	269	*
segundo	0:ac1725ba162c	270	* @param addr ip address in network order to convert
segundo	0:ac1725ba162c	271	* @param buf target buffer where the string is stored
segundo	0:ac1725ba162c	272	* @param buflen length of buf
segundo	0:ac1725ba162c	273	* @return either pointer to buf which now holds the ASCII
segundo	0:ac1725ba162c	274	* representation of addr or NULL if buf was too small
segundo	0:ac1725ba162c	275	*/
segundo	0:ac1725ba162c	276	char ipaddr_ntoa_r(const ip_addr_t addr, char *buf, int buflen)
segundo	0:ac1725ba162c	277	{
segundo	0:ac1725ba162c	278	u32_t s_addr;
segundo	0:ac1725ba162c	279	char inv[3];
segundo	0:ac1725ba162c	280	char *rp;
segundo	0:ac1725ba162c	281	u8_t *ap;
segundo	0:ac1725ba162c	282	u8_t rem;
segundo	0:ac1725ba162c	283	u8_t n;
segundo	0:ac1725ba162c	284	u8_t i;
segundo	0:ac1725ba162c	285	int len = 0;
segundo	0:ac1725ba162c	286
segundo	0:ac1725ba162c	287	s_addr = ip4_addr_get_u32(addr);
segundo	0:ac1725ba162c	288
segundo	0:ac1725ba162c	289	rp = buf;
segundo	0:ac1725ba162c	290	ap = (u8_t *)&s_addr;
segundo	0:ac1725ba162c	291	for(n = 0; n < 4; n++) {
segundo	0:ac1725ba162c	292	i = 0;
segundo	0:ac1725ba162c	293	do {
segundo	0:ac1725ba162c	294	rem = *ap % (u8_t)10;
segundo	0:ac1725ba162c	295	*ap /= (u8_t)10;
segundo	0:ac1725ba162c	296	inv[i++] = '0' + rem;
segundo	0:ac1725ba162c	297	} while(*ap);
segundo	0:ac1725ba162c	298	while(i--) {
segundo	0:ac1725ba162c	299	if (len++ >= buflen) {
segundo	0:ac1725ba162c	300	return NULL;
segundo	0:ac1725ba162c	301	}
segundo	0:ac1725ba162c	302	*rp++ = inv[i];
segundo	0:ac1725ba162c	303	}
segundo	0:ac1725ba162c	304	if (len++ >= buflen) {
segundo	0:ac1725ba162c	305	return NULL;
segundo	0:ac1725ba162c	306	}
segundo	0:ac1725ba162c	307	*rp++ = '.';
segundo	0:ac1725ba162c	308	ap++;
segundo	0:ac1725ba162c	309	}
segundo	0:ac1725ba162c	310	*--rp = 0;
segundo	0:ac1725ba162c	311	return buf;
segundo	0:ac1725ba162c	312	}

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Type:	Library
Created:	09 Nov 2010
Imports:	3034
Forks:	1
Commits:	8
Dependents:	42
Dependencies:	0
Followers:	27

lwip/core/ipv4/ip_addr.c@0:ac1725ba162c, 2010-11-09 (annotated)

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