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lwip/core/ipv4/ip_addr.c@0:632c9925f013, 2010-06-11 (annotated)

Committer:: donatien
Date:: Fri Jun 11 16:05:15 2010 +0000
Revision:: 0:632c9925f013
Child:: 5:dd63a1e02b1b

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:632c9925f013	1	/**
donatien	0:632c9925f013	2	* @file
donatien	0:632c9925f013	3	* This is the IPv4 address tools implementation.
donatien	0:632c9925f013	4	*
donatien	0:632c9925f013	5	*/
donatien	0:632c9925f013	6
donatien	0:632c9925f013	7	/*
donatien	0:632c9925f013	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
donatien	0:632c9925f013	9	* All rights reserved.
donatien	0:632c9925f013	10	*
donatien	0:632c9925f013	11	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:632c9925f013	12	* are permitted provided that the following conditions are met:
donatien	0:632c9925f013	13	*
donatien	0:632c9925f013	14	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:632c9925f013	15	* this list of conditions and the following disclaimer.
donatien	0:632c9925f013	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:632c9925f013	17	* this list of conditions and the following disclaimer in the documentation
donatien	0:632c9925f013	18	* and/or other materials provided with the distribution.
donatien	0:632c9925f013	19	* 3. The name of the author may not be used to endorse or promote products
donatien	0:632c9925f013	20	* derived from this software without specific prior written permission.
donatien	0:632c9925f013	21	*
donatien	0:632c9925f013	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:632c9925f013	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:632c9925f013	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:632c9925f013	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:632c9925f013	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:632c9925f013	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:632c9925f013	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:632c9925f013	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:632c9925f013	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:632c9925f013	31	* OF SUCH DAMAGE.
donatien	0:632c9925f013	32	*
donatien	0:632c9925f013	33	* This file is part of the lwIP TCP/IP stack.
donatien	0:632c9925f013	34	*
donatien	0:632c9925f013	35	* Author: Adam Dunkels <adam@sics.se>
donatien	0:632c9925f013	36	*
donatien	0:632c9925f013	37	*/
donatien	0:632c9925f013	38
donatien	0:632c9925f013	39	#include "lwip/opt.h"
donatien	0:632c9925f013	40	#include "lwip/ip_addr.h"
donatien	0:632c9925f013	41	#include "lwip/netif.h"
donatien	0:632c9925f013	42
donatien	0:632c9925f013	43	/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
donatien	0:632c9925f013	44	const ip_addr_t ip_addr_any = { IPADDR_ANY };
donatien	0:632c9925f013	45	const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
donatien	0:632c9925f013	46
donatien	0:632c9925f013	47	/**
donatien	0:632c9925f013	48	* Determine if an address is a broadcast address on a network interface
donatien	0:632c9925f013	49	*
donatien	0:632c9925f013	50	* @param addr address to be checked
donatien	0:632c9925f013	51	* @param netif the network interface against which the address is checked
donatien	0:632c9925f013	52	* @return returns non-zero if the address is a broadcast address
donatien	0:632c9925f013	53	*/
donatien	0:632c9925f013	54	u8_t ip_addr_isbroadcast(ip_addr_t addr, struct netif netif)
donatien	0:632c9925f013	55	{
donatien	0:632c9925f013	56	u32_t addr2test;
donatien	0:632c9925f013	57
donatien	0:632c9925f013	58	addr2test = ip4_addr_get_u32(addr);
donatien	0:632c9925f013	59	/* all ones (broadcast) or all zeroes (old skool broadcast) */
donatien	0:632c9925f013	60	if ((~addr2test == IPADDR_ANY) \|\|
donatien	0:632c9925f013	61	(addr2test == IPADDR_ANY))
donatien	0:632c9925f013	62	return 1;
donatien	0:632c9925f013	63	/* no broadcast support on this network interface? */
donatien	0:632c9925f013	64	else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0)
donatien	0:632c9925f013	65	/* the given address cannot be a broadcast address
donatien	0:632c9925f013	66	* nor can we check against any broadcast addresses */
donatien	0:632c9925f013	67	return 0;
donatien	0:632c9925f013	68	/* address matches network interface address exactly? => no broadcast */
donatien	0:632c9925f013	69	else if (addr2test == ip4_addr_get_u32(&netif->ip_addr))
donatien	0:632c9925f013	70	return 0;
donatien	0:632c9925f013	71	/* on the same (sub) network... */
donatien	0:632c9925f013	72	else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask))
donatien	0:632c9925f013	73	/* ...and host identifier bits are all ones? =>... */
donatien	0:632c9925f013	74	&& ((addr2test & ~ip4_addr_get_u32(&netif->netmask)) ==
donatien	0:632c9925f013	75	(IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask))))
donatien	0:632c9925f013	76	/* => network broadcast address */
donatien	0:632c9925f013	77	return 1;
donatien	0:632c9925f013	78	else
donatien	0:632c9925f013	79	return 0;
donatien	0:632c9925f013	80	}
donatien	0:632c9925f013	81
donatien	0:632c9925f013	82	/* Here for now until needed in other places in lwIP */
donatien	0:632c9925f013	83	#ifndef isprint
donatien	0:632c9925f013	84	#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
donatien	0:632c9925f013	85	#define isprint(c) in_range(c, 0x20, 0x7f)
donatien	0:632c9925f013	86	#define isdigit(c) in_range(c, '0', '9')
donatien	0:632c9925f013	87	#define isxdigit(c) (isdigit(c) \|\| in_range(c, 'a', 'f') \|\| in_range(c, 'A', 'F'))
donatien	0:632c9925f013	88	#define islower(c) in_range(c, 'a', 'z')
donatien	0:632c9925f013	89	#define isspace(c) (c == ' ' \|\| c == '\f' \|\| c == '\n' \|\| c == '\r' \|\| c == '\t' \|\| c == '\v')
donatien	0:632c9925f013	90	#endif
donatien	0:632c9925f013	91
donatien	0:632c9925f013	92	/**
donatien	0:632c9925f013	93	* Ascii internet address interpretation routine.
donatien	0:632c9925f013	94	* The value returned is in network order.
donatien	0:632c9925f013	95	*
donatien	0:632c9925f013	96	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
donatien	0:632c9925f013	97	* @return ip address in network order
donatien	0:632c9925f013	98	*/
donatien	0:632c9925f013	99	u32_t
donatien	0:632c9925f013	100	ipaddr_addr(const char *cp)
donatien	0:632c9925f013	101	{
donatien	0:632c9925f013	102	ip_addr_t val;
donatien	0:632c9925f013	103
donatien	0:632c9925f013	104	if (ipaddr_aton(cp, &val)) {
donatien	0:632c9925f013	105	return ip4_addr_get_u32(&val);
donatien	0:632c9925f013	106	}
donatien	0:632c9925f013	107	return (IPADDR_NONE);
donatien	0:632c9925f013	108	}
donatien	0:632c9925f013	109
donatien	0:632c9925f013	110	/**
donatien	0:632c9925f013	111	* Check whether "cp" is a valid ascii representation
donatien	0:632c9925f013	112	* of an Internet address and convert to a binary address.
donatien	0:632c9925f013	113	* Returns 1 if the address is valid, 0 if not.
donatien	0:632c9925f013	114	* This replaces inet_addr, the return value from which
donatien	0:632c9925f013	115	* cannot distinguish between failure and a local broadcast address.
donatien	0:632c9925f013	116	*
donatien	0:632c9925f013	117	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
donatien	0:632c9925f013	118	* @param addr pointer to which to save the ip address in network order
donatien	0:632c9925f013	119	* @return 1 if cp could be converted to addr, 0 on failure
donatien	0:632c9925f013	120	*/
donatien	0:632c9925f013	121	int
donatien	0:632c9925f013	122	ipaddr_aton(const char cp, ip_addr_t addr)
donatien	0:632c9925f013	123	{
donatien	0:632c9925f013	124	u32_t val;
donatien	0:632c9925f013	125	u8_t base;
donatien	0:632c9925f013	126	char c;
donatien	0:632c9925f013	127	u32_t parts[4];
donatien	0:632c9925f013	128	u32_t *pp = parts;
donatien	0:632c9925f013	129
donatien	0:632c9925f013	130	c = *cp;
donatien	0:632c9925f013	131	for (;;) {
donatien	0:632c9925f013	132	/*
donatien	0:632c9925f013	133	* Collect number up to ``.''.
donatien	0:632c9925f013	134	* Values are specified as for C:
donatien	0:632c9925f013	135	* 0x=hex, 0=octal, 1-9=decimal.
donatien	0:632c9925f013	136	*/
donatien	0:632c9925f013	137	if (!isdigit(c))
donatien	0:632c9925f013	138	return (0);
donatien	0:632c9925f013	139	val = 0;
donatien	0:632c9925f013	140	base = 10;
donatien	0:632c9925f013	141	if (c == '0') {
donatien	0:632c9925f013	142	c = *++cp;
donatien	0:632c9925f013	143	if (c == 'x' \|\| c == 'X') {
donatien	0:632c9925f013	144	base = 16;
donatien	0:632c9925f013	145	c = *++cp;
donatien	0:632c9925f013	146	} else
donatien	0:632c9925f013	147	base = 8;
donatien	0:632c9925f013	148	}
donatien	0:632c9925f013	149	for (;;) {
donatien	0:632c9925f013	150	if (isdigit(c)) {
donatien	0:632c9925f013	151	val = (val * base) + (int)(c - '0');
donatien	0:632c9925f013	152	c = *++cp;
donatien	0:632c9925f013	153	} else if (base == 16 && isxdigit(c)) {
donatien	0:632c9925f013	154	val = (val << 4) \| (int)(c + 10 - (islower(c) ? 'a' : 'A'));
donatien	0:632c9925f013	155	c = *++cp;
donatien	0:632c9925f013	156	} else
donatien	0:632c9925f013	157	break;
donatien	0:632c9925f013	158	}
donatien	0:632c9925f013	159	if (c == '.') {
donatien	0:632c9925f013	160	/*
donatien	0:632c9925f013	161	* Internet format:
donatien	0:632c9925f013	162	* a.b.c.d
donatien	0:632c9925f013	163	* a.b.c (with c treated as 16 bits)
donatien	0:632c9925f013	164	* a.b (with b treated as 24 bits)
donatien	0:632c9925f013	165	*/
donatien	0:632c9925f013	166	if (pp >= parts + 3)
donatien	0:632c9925f013	167	return (0);
donatien	0:632c9925f013	168	*pp++ = val;
donatien	0:632c9925f013	169	c = *++cp;
donatien	0:632c9925f013	170	} else
donatien	0:632c9925f013	171	break;
donatien	0:632c9925f013	172	}
donatien	0:632c9925f013	173	/*
donatien	0:632c9925f013	174	* Check for trailing characters.
donatien	0:632c9925f013	175	*/
donatien	0:632c9925f013	176	if (c != '\0' && !isspace(c))
donatien	0:632c9925f013	177	return (0);
donatien	0:632c9925f013	178	/*
donatien	0:632c9925f013	179	* Concoct the address according to
donatien	0:632c9925f013	180	* the number of parts specified.
donatien	0:632c9925f013	181	*/
donatien	0:632c9925f013	182	switch (pp - parts + 1) {
donatien	0:632c9925f013	183
donatien	0:632c9925f013	184	case 0:
donatien	0:632c9925f013	185	return (0); /* initial nondigit */
donatien	0:632c9925f013	186
donatien	0:632c9925f013	187	case 1: /* a -- 32 bits */
donatien	0:632c9925f013	188	break;
donatien	0:632c9925f013	189
donatien	0:632c9925f013	190	case 2: /* a.b -- 8.24 bits */
donatien	0:632c9925f013	191	if (val > 0xffffffUL)
donatien	0:632c9925f013	192	return (0);
donatien	0:632c9925f013	193	val \|= parts[0] << 24;
donatien	0:632c9925f013	194	break;
donatien	0:632c9925f013	195
donatien	0:632c9925f013	196	case 3: /* a.b.c -- 8.8.16 bits */
donatien	0:632c9925f013	197	if (val > 0xffff)
donatien	0:632c9925f013	198	return (0);
donatien	0:632c9925f013	199	val \|= (parts[0] << 24) \| (parts[1] << 16);
donatien	0:632c9925f013	200	break;
donatien	0:632c9925f013	201
donatien	0:632c9925f013	202	case 4: /* a.b.c.d -- 8.8.8.8 bits */
donatien	0:632c9925f013	203	if (val > 0xff)
donatien	0:632c9925f013	204	return (0);
donatien	0:632c9925f013	205	val \|= (parts[0] << 24) \| (parts[1] << 16) \| (parts[2] << 8);
donatien	0:632c9925f013	206	break;
donatien	0:632c9925f013	207	}
donatien	0:632c9925f013	208	if (addr) {
donatien	0:632c9925f013	209	ip4_addr_set_u32(addr, htonl(val));
donatien	0:632c9925f013	210	}
donatien	0:632c9925f013	211	return (1);
donatien	0:632c9925f013	212	}
donatien	0:632c9925f013	213
donatien	0:632c9925f013	214	/**
donatien	0:632c9925f013	215	* Convert numeric IP address into decimal dotted ASCII representation.
donatien	0:632c9925f013	216	* returns ptr to static buffer; not reentrant!
donatien	0:632c9925f013	217	*
donatien	0:632c9925f013	218	* @param addr ip address in network order to convert
donatien	0:632c9925f013	219	* @return pointer to a global static (!) buffer that holds the ASCII
donatien	0:632c9925f013	220	* represenation of addr
donatien	0:632c9925f013	221	*/
donatien	0:632c9925f013	222	char *
donatien	0:632c9925f013	223	ipaddr_ntoa(ip_addr_t *addr)
donatien	0:632c9925f013	224	{
donatien	0:632c9925f013	225	static char str[16];
donatien	0:632c9925f013	226	return ipaddr_ntoa_r(addr, str, 16);
donatien	0:632c9925f013	227	}
donatien	0:632c9925f013	228
donatien	0:632c9925f013	229	/**
donatien	0:632c9925f013	230	* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
donatien	0:632c9925f013	231	*
donatien	0:632c9925f013	232	* @param addr ip address in network order to convert
donatien	0:632c9925f013	233	* @param buf target buffer where the string is stored
donatien	0:632c9925f013	234	* @param buflen length of buf
donatien	0:632c9925f013	235	* @return either pointer to buf which now holds the ASCII
donatien	0:632c9925f013	236	* representation of addr or NULL if buf was too small
donatien	0:632c9925f013	237	*/
donatien	0:632c9925f013	238	char ipaddr_ntoa_r(ip_addr_t addr, char *buf, int buflen)
donatien	0:632c9925f013	239	{
donatien	0:632c9925f013	240	u32_t s_addr;
donatien	0:632c9925f013	241	char inv[3];
donatien	0:632c9925f013	242	char *rp;
donatien	0:632c9925f013	243	u8_t *ap;
donatien	0:632c9925f013	244	u8_t rem;
donatien	0:632c9925f013	245	u8_t n;
donatien	0:632c9925f013	246	u8_t i;
donatien	0:632c9925f013	247	int len = 0;
donatien	0:632c9925f013	248
donatien	0:632c9925f013	249	s_addr = ip4_addr_get_u32(addr);
donatien	0:632c9925f013	250
donatien	0:632c9925f013	251	rp = buf;
donatien	0:632c9925f013	252	ap = (u8_t *)&s_addr;
donatien	0:632c9925f013	253	for(n = 0; n < 4; n++) {
donatien	0:632c9925f013	254	i = 0;
donatien	0:632c9925f013	255	do {
donatien	0:632c9925f013	256	rem = *ap % (u8_t)10;
donatien	0:632c9925f013	257	*ap /= (u8_t)10;
donatien	0:632c9925f013	258	inv[i++] = '0' + rem;
donatien	0:632c9925f013	259	} while(*ap);
donatien	0:632c9925f013	260	while(i--) {
donatien	0:632c9925f013	261	if (len++ >= buflen) {
donatien	0:632c9925f013	262	return NULL;
donatien	0:632c9925f013	263	}
donatien	0:632c9925f013	264	*rp++ = inv[i];
donatien	0:632c9925f013	265	}
donatien	0:632c9925f013	266	if (len++ >= buflen) {
donatien	0:632c9925f013	267	return NULL;
donatien	0:632c9925f013	268	}
donatien	0:632c9925f013	269	*rp++ = '.';
donatien	0:632c9925f013	270	ap++;
donatien	0:632c9925f013	271	}
donatien	0:632c9925f013	272	*--rp = 0;
donatien	0:632c9925f013	273	return buf;
donatien	0:632c9925f013	274	}

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Type:	Program
Created:	11 Jun 2010
Imports:	2654
Forks:	0
Commits:	12
Dependents:	3
Dependencies:	0
Followers:	13

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lwip/core/ipv4/ip_addr.c@0:632c9925f013, 2010-06-11 (annotated)

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