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Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies: FatFileSystem mbed WeatherMeters SDFileSystem

NetStack/lwip/core/ipv4/ip_addr.c@0:616601bde9fb, 2012-02-23 (annotated)

Committer:: AdamGreen
Date:: Thu Feb 23 21:38:39 2012 +0000
Revision:: 0:616601bde9fb

Who changed what in which revision?

User	Revision	Line number	New contents of line
AdamGreen	0:616601bde9fb	1	/**
AdamGreen	0:616601bde9fb	2	* @file
AdamGreen	0:616601bde9fb	3	* This is the IPv4 address tools implementation.
AdamGreen	0:616601bde9fb	4	*
AdamGreen	0:616601bde9fb	5	*/
AdamGreen	0:616601bde9fb	6
AdamGreen	0:616601bde9fb	7	/*
AdamGreen	0:616601bde9fb	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen	0:616601bde9fb	9	* All rights reserved.
AdamGreen	0:616601bde9fb	10	*
AdamGreen	0:616601bde9fb	11	* Redistribution and use in source and binary forms, with or without modification,
AdamGreen	0:616601bde9fb	12	* are permitted provided that the following conditions are met:
AdamGreen	0:616601bde9fb	13	*
AdamGreen	0:616601bde9fb	14	* 1. Redistributions of source code must retain the above copyright notice,
AdamGreen	0:616601bde9fb	15	* this list of conditions and the following disclaimer.
AdamGreen	0:616601bde9fb	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen	0:616601bde9fb	17	* this list of conditions and the following disclaimer in the documentation
AdamGreen	0:616601bde9fb	18	* and/or other materials provided with the distribution.
AdamGreen	0:616601bde9fb	19	* 3. The name of the author may not be used to endorse or promote products
AdamGreen	0:616601bde9fb	20	* derived from this software without specific prior written permission.
AdamGreen	0:616601bde9fb	21	*
AdamGreen	0:616601bde9fb	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen	0:616601bde9fb	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen	0:616601bde9fb	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen	0:616601bde9fb	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen	0:616601bde9fb	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen	0:616601bde9fb	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen	0:616601bde9fb	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen	0:616601bde9fb	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen	0:616601bde9fb	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen	0:616601bde9fb	31	* OF SUCH DAMAGE.
AdamGreen	0:616601bde9fb	32	*
AdamGreen	0:616601bde9fb	33	* This file is part of the lwIP TCP/IP stack.
AdamGreen	0:616601bde9fb	34	*
AdamGreen	0:616601bde9fb	35	* Author: Adam Dunkels <adam@sics.se>
AdamGreen	0:616601bde9fb	36	*
AdamGreen	0:616601bde9fb	37	*/
AdamGreen	0:616601bde9fb	38
AdamGreen	0:616601bde9fb	39	#include "lwip/opt.h"
AdamGreen	0:616601bde9fb	40	#include "lwip/ip_addr.h"
AdamGreen	0:616601bde9fb	41	#include "lwip/netif.h"
AdamGreen	0:616601bde9fb	42
AdamGreen	0:616601bde9fb	43	/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
AdamGreen	0:616601bde9fb	44	const ip_addr_t ip_addr_any = { IPADDR_ANY };
AdamGreen	0:616601bde9fb	45	const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
AdamGreen	0:616601bde9fb	46
AdamGreen	0:616601bde9fb	47	/**
AdamGreen	0:616601bde9fb	48	* Determine if an address is a broadcast address on a network interface
AdamGreen	0:616601bde9fb	49	*
AdamGreen	0:616601bde9fb	50	* @param addr address to be checked
AdamGreen	0:616601bde9fb	51	* @param netif the network interface against which the address is checked
AdamGreen	0:616601bde9fb	52	* @return returns non-zero if the address is a broadcast address
AdamGreen	0:616601bde9fb	53	*/
AdamGreen	0:616601bde9fb	54	u8_t
AdamGreen	0:616601bde9fb	55	ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
AdamGreen	0:616601bde9fb	56	{
AdamGreen	0:616601bde9fb	57	ip_addr_t ipaddr;
AdamGreen	0:616601bde9fb	58	ip4_addr_set_u32(&ipaddr, addr);
AdamGreen	0:616601bde9fb	59
AdamGreen	0:616601bde9fb	60	/* all ones (broadcast) or all zeroes (old skool broadcast) */
AdamGreen	0:616601bde9fb	61	if ((~addr == IPADDR_ANY) \|\|
AdamGreen	0:616601bde9fb	62	(addr == IPADDR_ANY)) {
AdamGreen	0:616601bde9fb	63	return 1;
AdamGreen	0:616601bde9fb	64	/* no broadcast support on this network interface? */
AdamGreen	0:616601bde9fb	65	} else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
AdamGreen	0:616601bde9fb	66	/* the given address cannot be a broadcast address
AdamGreen	0:616601bde9fb	67	* nor can we check against any broadcast addresses */
AdamGreen	0:616601bde9fb	68	return 0;
AdamGreen	0:616601bde9fb	69	/* address matches network interface address exactly? => no broadcast */
AdamGreen	0:616601bde9fb	70	} else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
AdamGreen	0:616601bde9fb	71	return 0;
AdamGreen	0:616601bde9fb	72	/* on the same (sub) network... */
AdamGreen	0:616601bde9fb	73	} else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
AdamGreen	0:616601bde9fb	74	/* ...and host identifier bits are all ones? =>... */
AdamGreen	0:616601bde9fb	75	&& ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
AdamGreen	0:616601bde9fb	76	(IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
AdamGreen	0:616601bde9fb	77	/* => network broadcast address */
AdamGreen	0:616601bde9fb	78	return 1;
AdamGreen	0:616601bde9fb	79	} else {
AdamGreen	0:616601bde9fb	80	return 0;
AdamGreen	0:616601bde9fb	81	}
AdamGreen	0:616601bde9fb	82	}
AdamGreen	0:616601bde9fb	83
AdamGreen	0:616601bde9fb	84	/** Checks if a netmask is valid (starting with ones, then only zeros)
AdamGreen	0:616601bde9fb	85	*
AdamGreen	0:616601bde9fb	86	* @param netmask the IPv4 netmask to check (in network byte order!)
AdamGreen	0:616601bde9fb	87	* @return 1 if the netmask is valid, 0 if it is not
AdamGreen	0:616601bde9fb	88	*/
AdamGreen	0:616601bde9fb	89	u8_t
AdamGreen	0:616601bde9fb	90	ip4_addr_netmask_valid(u32_t netmask)
AdamGreen	0:616601bde9fb	91	{
AdamGreen	0:616601bde9fb	92	u32_t mask;
AdamGreen	0:616601bde9fb	93	u32_t nm_hostorder = lwip_htonl(netmask);
AdamGreen	0:616601bde9fb	94
AdamGreen	0:616601bde9fb	95	/* first, check for the first zero */
AdamGreen	0:616601bde9fb	96	for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
AdamGreen	0:616601bde9fb	97	if ((nm_hostorder & mask) == 0) {
AdamGreen	0:616601bde9fb	98	break;
AdamGreen	0:616601bde9fb	99	}
AdamGreen	0:616601bde9fb	100	}
AdamGreen	0:616601bde9fb	101	/* then check that there is no one */
AdamGreen	0:616601bde9fb	102	for (; mask != 0; mask >>= 1) {
AdamGreen	0:616601bde9fb	103	if ((nm_hostorder & mask) != 0) {
AdamGreen	0:616601bde9fb	104	/* there is a one after the first zero -> invalid */
AdamGreen	0:616601bde9fb	105	return 0;
AdamGreen	0:616601bde9fb	106	}
AdamGreen	0:616601bde9fb	107	}
AdamGreen	0:616601bde9fb	108	/* no one after the first zero -> valid */
AdamGreen	0:616601bde9fb	109	return 1;
AdamGreen	0:616601bde9fb	110	}
AdamGreen	0:616601bde9fb	111
AdamGreen	0:616601bde9fb	112	/* Here for now until needed in other places in lwIP */
AdamGreen	0:616601bde9fb	113	#ifndef isprint
AdamGreen	0:616601bde9fb	114	#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
AdamGreen	0:616601bde9fb	115	#define isprint(c) in_range(c, 0x20, 0x7f)
AdamGreen	0:616601bde9fb	116	#define isdigit(c) in_range(c, '0', '9')
AdamGreen	0:616601bde9fb	117	#define isxdigit(c) (isdigit(c) \|\| in_range(c, 'a', 'f') \|\| in_range(c, 'A', 'F'))
AdamGreen	0:616601bde9fb	118	#define islower(c) in_range(c, 'a', 'z')
AdamGreen	0:616601bde9fb	119	#define isspace(c) (c == ' ' \|\| c == '\f' \|\| c == '\n' \|\| c == '\r' \|\| c == '\t' \|\| c == '\v')
AdamGreen	0:616601bde9fb	120	#endif
AdamGreen	0:616601bde9fb	121
AdamGreen	0:616601bde9fb	122	/**
AdamGreen	0:616601bde9fb	123	* Ascii internet address interpretation routine.
AdamGreen	0:616601bde9fb	124	* The value returned is in network order.
AdamGreen	0:616601bde9fb	125	*
AdamGreen	0:616601bde9fb	126	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
AdamGreen	0:616601bde9fb	127	* @return ip address in network order
AdamGreen	0:616601bde9fb	128	*/
AdamGreen	0:616601bde9fb	129	u32_t
AdamGreen	0:616601bde9fb	130	ipaddr_addr(const char *cp)
AdamGreen	0:616601bde9fb	131	{
AdamGreen	0:616601bde9fb	132	ip_addr_t val;
AdamGreen	0:616601bde9fb	133
AdamGreen	0:616601bde9fb	134	if (ipaddr_aton(cp, &val)) {
AdamGreen	0:616601bde9fb	135	return ip4_addr_get_u32(&val);
AdamGreen	0:616601bde9fb	136	}
AdamGreen	0:616601bde9fb	137	return (IPADDR_NONE);
AdamGreen	0:616601bde9fb	138	}
AdamGreen	0:616601bde9fb	139
AdamGreen	0:616601bde9fb	140	/**
AdamGreen	0:616601bde9fb	141	* Check whether "cp" is a valid ascii representation
AdamGreen	0:616601bde9fb	142	* of an Internet address and convert to a binary address.
AdamGreen	0:616601bde9fb	143	* Returns 1 if the address is valid, 0 if not.
AdamGreen	0:616601bde9fb	144	* This replaces inet_addr, the return value from which
AdamGreen	0:616601bde9fb	145	* cannot distinguish between failure and a local broadcast address.
AdamGreen	0:616601bde9fb	146	*
AdamGreen	0:616601bde9fb	147	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
AdamGreen	0:616601bde9fb	148	* @param addr pointer to which to save the ip address in network order
AdamGreen	0:616601bde9fb	149	* @return 1 if cp could be converted to addr, 0 on failure
AdamGreen	0:616601bde9fb	150	*/
AdamGreen	0:616601bde9fb	151	int
AdamGreen	0:616601bde9fb	152	ipaddr_aton(const char cp, ip_addr_t addr)
AdamGreen	0:616601bde9fb	153	{
AdamGreen	0:616601bde9fb	154	u32_t val;
AdamGreen	0:616601bde9fb	155	u8_t base;
AdamGreen	0:616601bde9fb	156	char c;
AdamGreen	0:616601bde9fb	157	u32_t parts[4];
AdamGreen	0:616601bde9fb	158	u32_t *pp = parts;
AdamGreen	0:616601bde9fb	159
AdamGreen	0:616601bde9fb	160	c = *cp;
AdamGreen	0:616601bde9fb	161	for (;;) {
AdamGreen	0:616601bde9fb	162	/*
AdamGreen	0:616601bde9fb	163	* Collect number up to ``.''.
AdamGreen	0:616601bde9fb	164	* Values are specified as for C:
AdamGreen	0:616601bde9fb	165	* 0x=hex, 0=octal, 1-9=decimal.
AdamGreen	0:616601bde9fb	166	*/
AdamGreen	0:616601bde9fb	167	if (!isdigit(c))
AdamGreen	0:616601bde9fb	168	return (0);
AdamGreen	0:616601bde9fb	169	val = 0;
AdamGreen	0:616601bde9fb	170	base = 10;
AdamGreen	0:616601bde9fb	171	if (c == '0') {
AdamGreen	0:616601bde9fb	172	c = *++cp;
AdamGreen	0:616601bde9fb	173	if (c == 'x' \|\| c == 'X') {
AdamGreen	0:616601bde9fb	174	base = 16;
AdamGreen	0:616601bde9fb	175	c = *++cp;
AdamGreen	0:616601bde9fb	176	} else
AdamGreen	0:616601bde9fb	177	base = 8;
AdamGreen	0:616601bde9fb	178	}
AdamGreen	0:616601bde9fb	179	for (;;) {
AdamGreen	0:616601bde9fb	180	if (isdigit(c)) {
AdamGreen	0:616601bde9fb	181	val = (val * base) + (int)(c - '0');
AdamGreen	0:616601bde9fb	182	c = *++cp;
AdamGreen	0:616601bde9fb	183	} else if (base == 16 && isxdigit(c)) {
AdamGreen	0:616601bde9fb	184	val = (val << 4) \| (int)(c + 10 - (islower(c) ? 'a' : 'A'));
AdamGreen	0:616601bde9fb	185	c = *++cp;
AdamGreen	0:616601bde9fb	186	} else
AdamGreen	0:616601bde9fb	187	break;
AdamGreen	0:616601bde9fb	188	}
AdamGreen	0:616601bde9fb	189	if (c == '.') {
AdamGreen	0:616601bde9fb	190	/*
AdamGreen	0:616601bde9fb	191	* Internet format:
AdamGreen	0:616601bde9fb	192	* a.b.c.d
AdamGreen	0:616601bde9fb	193	* a.b.c (with c treated as 16 bits)
AdamGreen	0:616601bde9fb	194	* a.b (with b treated as 24 bits)
AdamGreen	0:616601bde9fb	195	*/
AdamGreen	0:616601bde9fb	196	if (pp >= parts + 3) {
AdamGreen	0:616601bde9fb	197	return (0);
AdamGreen	0:616601bde9fb	198	}
AdamGreen	0:616601bde9fb	199	*pp++ = val;
AdamGreen	0:616601bde9fb	200	c = *++cp;
AdamGreen	0:616601bde9fb	201	} else
AdamGreen	0:616601bde9fb	202	break;
AdamGreen	0:616601bde9fb	203	}
AdamGreen	0:616601bde9fb	204	/*
AdamGreen	0:616601bde9fb	205	* Check for trailing characters.
AdamGreen	0:616601bde9fb	206	*/
AdamGreen	0:616601bde9fb	207	if (c != '\0' && !isspace(c)) {
AdamGreen	0:616601bde9fb	208	return (0);
AdamGreen	0:616601bde9fb	209	}
AdamGreen	0:616601bde9fb	210	/*
AdamGreen	0:616601bde9fb	211	* Concoct the address according to
AdamGreen	0:616601bde9fb	212	* the number of parts specified.
AdamGreen	0:616601bde9fb	213	*/
AdamGreen	0:616601bde9fb	214	switch (pp - parts + 1) {
AdamGreen	0:616601bde9fb	215
AdamGreen	0:616601bde9fb	216	case 0:
AdamGreen	0:616601bde9fb	217	return (0); /* initial nondigit */
AdamGreen	0:616601bde9fb	218
AdamGreen	0:616601bde9fb	219	case 1: /* a -- 32 bits */
AdamGreen	0:616601bde9fb	220	break;
AdamGreen	0:616601bde9fb	221
AdamGreen	0:616601bde9fb	222	case 2: /* a.b -- 8.24 bits */
AdamGreen	0:616601bde9fb	223	if (val > 0xffffffUL) {
AdamGreen	0:616601bde9fb	224	return (0);
AdamGreen	0:616601bde9fb	225	}
AdamGreen	0:616601bde9fb	226	val \|= parts[0] << 24;
AdamGreen	0:616601bde9fb	227	break;
AdamGreen	0:616601bde9fb	228
AdamGreen	0:616601bde9fb	229	case 3: /* a.b.c -- 8.8.16 bits */
AdamGreen	0:616601bde9fb	230	if (val > 0xffff) {
AdamGreen	0:616601bde9fb	231	return (0);
AdamGreen	0:616601bde9fb	232	}
AdamGreen	0:616601bde9fb	233	val \|= (parts[0] << 24) \| (parts[1] << 16);
AdamGreen	0:616601bde9fb	234	break;
AdamGreen	0:616601bde9fb	235
AdamGreen	0:616601bde9fb	236	case 4: /* a.b.c.d -- 8.8.8.8 bits */
AdamGreen	0:616601bde9fb	237	if (val > 0xff) {
AdamGreen	0:616601bde9fb	238	return (0);
AdamGreen	0:616601bde9fb	239	}
AdamGreen	0:616601bde9fb	240	val \|= (parts[0] << 24) \| (parts[1] << 16) \| (parts[2] << 8);
AdamGreen	0:616601bde9fb	241	break;
AdamGreen	0:616601bde9fb	242	default:
AdamGreen	0:616601bde9fb	243	LWIP_ASSERT("unhandled", 0);
AdamGreen	0:616601bde9fb	244	break;
AdamGreen	0:616601bde9fb	245	}
AdamGreen	0:616601bde9fb	246	if (addr) {
AdamGreen	0:616601bde9fb	247	ip4_addr_set_u32(addr, htonl(val));
AdamGreen	0:616601bde9fb	248	}
AdamGreen	0:616601bde9fb	249	return (1);
AdamGreen	0:616601bde9fb	250	}
AdamGreen	0:616601bde9fb	251
AdamGreen	0:616601bde9fb	252	/**
AdamGreen	0:616601bde9fb	253	* Convert numeric IP address into decimal dotted ASCII representation.
AdamGreen	0:616601bde9fb	254	* returns ptr to static buffer; not reentrant!
AdamGreen	0:616601bde9fb	255	*
AdamGreen	0:616601bde9fb	256	* @param addr ip address in network order to convert
AdamGreen	0:616601bde9fb	257	* @return pointer to a global static (!) buffer that holds the ASCII
AdamGreen	0:616601bde9fb	258	* represenation of addr
AdamGreen	0:616601bde9fb	259	*/
AdamGreen	0:616601bde9fb	260	char *
AdamGreen	0:616601bde9fb	261	ipaddr_ntoa(const ip_addr_t *addr)
AdamGreen	0:616601bde9fb	262	{
AdamGreen	0:616601bde9fb	263	static char str[16];
AdamGreen	0:616601bde9fb	264	return ipaddr_ntoa_r(addr, str, 16);
AdamGreen	0:616601bde9fb	265	}
AdamGreen	0:616601bde9fb	266
AdamGreen	0:616601bde9fb	267	/**
AdamGreen	0:616601bde9fb	268	* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
AdamGreen	0:616601bde9fb	269	*
AdamGreen	0:616601bde9fb	270	* @param addr ip address in network order to convert
AdamGreen	0:616601bde9fb	271	* @param buf target buffer where the string is stored
AdamGreen	0:616601bde9fb	272	* @param buflen length of buf
AdamGreen	0:616601bde9fb	273	* @return either pointer to buf which now holds the ASCII
AdamGreen	0:616601bde9fb	274	* representation of addr or NULL if buf was too small
AdamGreen	0:616601bde9fb	275	*/
AdamGreen	0:616601bde9fb	276	char ipaddr_ntoa_r(const ip_addr_t addr, char *buf, int buflen)
AdamGreen	0:616601bde9fb	277	{
AdamGreen	0:616601bde9fb	278	u32_t s_addr;
AdamGreen	0:616601bde9fb	279	char inv[3];
AdamGreen	0:616601bde9fb	280	char *rp;
AdamGreen	0:616601bde9fb	281	u8_t *ap;
AdamGreen	0:616601bde9fb	282	u8_t rem;
AdamGreen	0:616601bde9fb	283	u8_t n;
AdamGreen	0:616601bde9fb	284	u8_t i;
AdamGreen	0:616601bde9fb	285	int len = 0;
AdamGreen	0:616601bde9fb	286
AdamGreen	0:616601bde9fb	287	s_addr = ip4_addr_get_u32(addr);
AdamGreen	0:616601bde9fb	288
AdamGreen	0:616601bde9fb	289	rp = buf;
AdamGreen	0:616601bde9fb	290	ap = (u8_t *)&s_addr;
AdamGreen	0:616601bde9fb	291	for(n = 0; n < 4; n++) {
AdamGreen	0:616601bde9fb	292	i = 0;
AdamGreen	0:616601bde9fb	293	do {
AdamGreen	0:616601bde9fb	294	rem = *ap % (u8_t)10;
AdamGreen	0:616601bde9fb	295	*ap /= (u8_t)10;
AdamGreen	0:616601bde9fb	296	inv[i++] = '0' + rem;
AdamGreen	0:616601bde9fb	297	} while(*ap);
AdamGreen	0:616601bde9fb	298	while(i--) {
AdamGreen	0:616601bde9fb	299	if (len++ >= buflen) {
AdamGreen	0:616601bde9fb	300	return NULL;
AdamGreen	0:616601bde9fb	301	}
AdamGreen	0:616601bde9fb	302	*rp++ = inv[i];
AdamGreen	0:616601bde9fb	303	}
AdamGreen	0:616601bde9fb	304	if (len++ >= buflen) {
AdamGreen	0:616601bde9fb	305	return NULL;
AdamGreen	0:616601bde9fb	306	}
AdamGreen	0:616601bde9fb	307	*rp++ = '.';
AdamGreen	0:616601bde9fb	308	ap++;
AdamGreen	0:616601bde9fb	309	}
AdamGreen	0:616601bde9fb	310	*--rp = 0;
AdamGreen	0:616601bde9fb	311	return buf;
AdamGreen	0:616601bde9fb	312	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	23 Feb 2012
Imports:	113
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	4
Followers:	6

NetStack/lwip/core/ipv4/ip_addr.c@0:616601bde9fb, 2012-02-23 (annotated)

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