mbed unsupported / lwip

A version of LWIP, provided for backwards compatibility.

Dependents:   AA_DemoBoard DemoBoard HelloServerDemo DemoBoard_RangeIndicator ... more

trunk/Core/lwIP/core/ipv4/inet.c@0:5e1631496985, 2012-05-08 (annotated)

Committer:
root@mbed.org
Date:
Tue May 08 15:32:10 2012 +0100
Revision:
0:5e1631496985
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
root@mbed.org 0:5e1631496985 1 /**
root@mbed.org 0:5e1631496985 2 * @file
root@mbed.org 0:5e1631496985 3 * Functions common to all TCP/IPv4 modules, such as the byte order functions.
root@mbed.org 0:5e1631496985 4 *
root@mbed.org 0:5e1631496985 5 */
root@mbed.org 0:5e1631496985 6
root@mbed.org 0:5e1631496985 7 /*
root@mbed.org 0:5e1631496985 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
root@mbed.org 0:5e1631496985 9 * All rights reserved.
root@mbed.org 0:5e1631496985 10 *
root@mbed.org 0:5e1631496985 11 * Redistribution and use in source and binary forms, with or without modification,
root@mbed.org 0:5e1631496985 12 * are permitted provided that the following conditions are met:
root@mbed.org 0:5e1631496985 13 *
root@mbed.org 0:5e1631496985 14 * 1. Redistributions of source code must retain the above copyright notice,
root@mbed.org 0:5e1631496985 15 * this list of conditions and the following disclaimer.
root@mbed.org 0:5e1631496985 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
root@mbed.org 0:5e1631496985 17 * this list of conditions and the following disclaimer in the documentation
root@mbed.org 0:5e1631496985 18 * and/or other materials provided with the distribution.
root@mbed.org 0:5e1631496985 19 * 3. The name of the author may not be used to endorse or promote products
root@mbed.org 0:5e1631496985 20 * derived from this software without specific prior written permission.
root@mbed.org 0:5e1631496985 21 *
root@mbed.org 0:5e1631496985 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
root@mbed.org 0:5e1631496985 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
root@mbed.org 0:5e1631496985 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
root@mbed.org 0:5e1631496985 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
root@mbed.org 0:5e1631496985 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
root@mbed.org 0:5e1631496985 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
root@mbed.org 0:5e1631496985 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
root@mbed.org 0:5e1631496985 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
root@mbed.org 0:5e1631496985 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
root@mbed.org 0:5e1631496985 31 * OF SUCH DAMAGE.
root@mbed.org 0:5e1631496985 32 *
root@mbed.org 0:5e1631496985 33 * This file is part of the lwIP TCP/IP stack.
root@mbed.org 0:5e1631496985 34 *
root@mbed.org 0:5e1631496985 35 * Author: Adam Dunkels <adam@sics.se>
root@mbed.org 0:5e1631496985 36 *
root@mbed.org 0:5e1631496985 37 */
root@mbed.org 0:5e1631496985 38
root@mbed.org 0:5e1631496985 39 #include "lwip/opt.h"
root@mbed.org 0:5e1631496985 40
root@mbed.org 0:5e1631496985 41 #include "lwip/inet.h"
root@mbed.org 0:5e1631496985 42
root@mbed.org 0:5e1631496985 43 /* Here for now until needed in other places in lwIP */
root@mbed.org 0:5e1631496985 44 #ifndef isprint
root@mbed.org 0:5e1631496985 45 #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
root@mbed.org 0:5e1631496985 46 #define isprint(c) in_range(c, 0x20, 0x7f)
root@mbed.org 0:5e1631496985 47 #define isdigit(c) in_range(c, '0', '9')
root@mbed.org 0:5e1631496985 48 #define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
root@mbed.org 0:5e1631496985 49 #define islower(c) in_range(c, 'a', 'z')
root@mbed.org 0:5e1631496985 50 #define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
root@mbed.org 0:5e1631496985 51 #endif
root@mbed.org 0:5e1631496985 52
root@mbed.org 0:5e1631496985 53 /**
root@mbed.org 0:5e1631496985 54 * Ascii internet address interpretation routine.
root@mbed.org 0:5e1631496985 55 * The value returned is in network order.
root@mbed.org 0:5e1631496985 56 *
root@mbed.org 0:5e1631496985 57 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
root@mbed.org 0:5e1631496985 58 * @return ip address in network order
root@mbed.org 0:5e1631496985 59 */
root@mbed.org 0:5e1631496985 60 u32_t
root@mbed.org 0:5e1631496985 61 inet_addr(const char *cp)
root@mbed.org 0:5e1631496985 62 {
root@mbed.org 0:5e1631496985 63 struct in_addr val;
root@mbed.org 0:5e1631496985 64
root@mbed.org 0:5e1631496985 65 if (inet_aton(cp, &val)) {
root@mbed.org 0:5e1631496985 66 return (val.s_addr);
root@mbed.org 0:5e1631496985 67 }
root@mbed.org 0:5e1631496985 68 return (INADDR_NONE);
root@mbed.org 0:5e1631496985 69 }
root@mbed.org 0:5e1631496985 70
root@mbed.org 0:5e1631496985 71 /**
root@mbed.org 0:5e1631496985 72 * Check whether "cp" is a valid ascii representation
root@mbed.org 0:5e1631496985 73 * of an Internet address and convert to a binary address.
root@mbed.org 0:5e1631496985 74 * Returns 1 if the address is valid, 0 if not.
root@mbed.org 0:5e1631496985 75 * This replaces inet_addr, the return value from which
root@mbed.org 0:5e1631496985 76 * cannot distinguish between failure and a local broadcast address.
root@mbed.org 0:5e1631496985 77 *
root@mbed.org 0:5e1631496985 78 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
root@mbed.org 0:5e1631496985 79 * @param addr pointer to which to save the ip address in network order
root@mbed.org 0:5e1631496985 80 * @return 1 if cp could be converted to addr, 0 on failure
root@mbed.org 0:5e1631496985 81 */
root@mbed.org 0:5e1631496985 82 int
root@mbed.org 0:5e1631496985 83 inet_aton(const char *cp, struct in_addr *addr)
root@mbed.org 0:5e1631496985 84 {
root@mbed.org 0:5e1631496985 85 u32_t val;
root@mbed.org 0:5e1631496985 86 u8_t base;
root@mbed.org 0:5e1631496985 87 char c;
root@mbed.org 0:5e1631496985 88 u32_t parts[4];
root@mbed.org 0:5e1631496985 89 u32_t *pp = parts;
root@mbed.org 0:5e1631496985 90
root@mbed.org 0:5e1631496985 91 c = *cp;
root@mbed.org 0:5e1631496985 92 for (;;) {
root@mbed.org 0:5e1631496985 93 /*
root@mbed.org 0:5e1631496985 94 * Collect number up to ``.''.
root@mbed.org 0:5e1631496985 95 * Values are specified as for C:
root@mbed.org 0:5e1631496985 96 * 0x=hex, 0=octal, 1-9=decimal.
root@mbed.org 0:5e1631496985 97 */
root@mbed.org 0:5e1631496985 98 if (!isdigit(c))
root@mbed.org 0:5e1631496985 99 return (0);
root@mbed.org 0:5e1631496985 100 val = 0;
root@mbed.org 0:5e1631496985 101 base = 10;
root@mbed.org 0:5e1631496985 102 if (c == '0') {
root@mbed.org 0:5e1631496985 103 c = *++cp;
root@mbed.org 0:5e1631496985 104 if (c == 'x' || c == 'X') {
root@mbed.org 0:5e1631496985 105 base = 16;
root@mbed.org 0:5e1631496985 106 c = *++cp;
root@mbed.org 0:5e1631496985 107 } else
root@mbed.org 0:5e1631496985 108 base = 8;
root@mbed.org 0:5e1631496985 109 }
root@mbed.org 0:5e1631496985 110 for (;;) {
root@mbed.org 0:5e1631496985 111 if (isdigit(c)) {
root@mbed.org 0:5e1631496985 112 val = (val * base) + (int)(c - '0');
root@mbed.org 0:5e1631496985 113 c = *++cp;
root@mbed.org 0:5e1631496985 114 } else if (base == 16 && isxdigit(c)) {
root@mbed.org 0:5e1631496985 115 val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
root@mbed.org 0:5e1631496985 116 c = *++cp;
root@mbed.org 0:5e1631496985 117 } else
root@mbed.org 0:5e1631496985 118 break;
root@mbed.org 0:5e1631496985 119 }
root@mbed.org 0:5e1631496985 120 if (c == '.') {
root@mbed.org 0:5e1631496985 121 /*
root@mbed.org 0:5e1631496985 122 * Internet format:
root@mbed.org 0:5e1631496985 123 * a.b.c.d
root@mbed.org 0:5e1631496985 124 * a.b.c (with c treated as 16 bits)
root@mbed.org 0:5e1631496985 125 * a.b (with b treated as 24 bits)
root@mbed.org 0:5e1631496985 126 */
root@mbed.org 0:5e1631496985 127 if (pp >= parts + 3)
root@mbed.org 0:5e1631496985 128 return (0);
root@mbed.org 0:5e1631496985 129 *pp++ = val;
root@mbed.org 0:5e1631496985 130 c = *++cp;
root@mbed.org 0:5e1631496985 131 } else
root@mbed.org 0:5e1631496985 132 break;
root@mbed.org 0:5e1631496985 133 }
root@mbed.org 0:5e1631496985 134 /*
root@mbed.org 0:5e1631496985 135 * Check for trailing characters.
root@mbed.org 0:5e1631496985 136 */
root@mbed.org 0:5e1631496985 137 if (c != '\0' && !isspace(c))
root@mbed.org 0:5e1631496985 138 return (0);
root@mbed.org 0:5e1631496985 139 /*
root@mbed.org 0:5e1631496985 140 * Concoct the address according to
root@mbed.org 0:5e1631496985 141 * the number of parts specified.
root@mbed.org 0:5e1631496985 142 */
root@mbed.org 0:5e1631496985 143 switch (pp - parts + 1) {
root@mbed.org 0:5e1631496985 144
root@mbed.org 0:5e1631496985 145 case 0:
root@mbed.org 0:5e1631496985 146 return (0); /* initial nondigit */
root@mbed.org 0:5e1631496985 147
root@mbed.org 0:5e1631496985 148 case 1: /* a -- 32 bits */
root@mbed.org 0:5e1631496985 149 break;
root@mbed.org 0:5e1631496985 150
root@mbed.org 0:5e1631496985 151 case 2: /* a.b -- 8.24 bits */
root@mbed.org 0:5e1631496985 152 if (val > 0xffffffUL)
root@mbed.org 0:5e1631496985 153 return (0);
root@mbed.org 0:5e1631496985 154 val |= parts[0] << 24;
root@mbed.org 0:5e1631496985 155 break;
root@mbed.org 0:5e1631496985 156
root@mbed.org 0:5e1631496985 157 case 3: /* a.b.c -- 8.8.16 bits */
root@mbed.org 0:5e1631496985 158 if (val > 0xffff)
root@mbed.org 0:5e1631496985 159 return (0);
root@mbed.org 0:5e1631496985 160 val |= (parts[0] << 24) | (parts[1] << 16);
root@mbed.org 0:5e1631496985 161 break;
root@mbed.org 0:5e1631496985 162
root@mbed.org 0:5e1631496985 163 case 4: /* a.b.c.d -- 8.8.8.8 bits */
root@mbed.org 0:5e1631496985 164 if (val > 0xff)
root@mbed.org 0:5e1631496985 165 return (0);
root@mbed.org 0:5e1631496985 166 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
root@mbed.org 0:5e1631496985 167 break;
root@mbed.org 0:5e1631496985 168 }
root@mbed.org 0:5e1631496985 169 if (addr)
root@mbed.org 0:5e1631496985 170 addr->s_addr = htonl(val);
root@mbed.org 0:5e1631496985 171 return (1);
root@mbed.org 0:5e1631496985 172 }
root@mbed.org 0:5e1631496985 173
root@mbed.org 0:5e1631496985 174 /**
root@mbed.org 0:5e1631496985 175 * Convert numeric IP address into decimal dotted ASCII representation.
root@mbed.org 0:5e1631496985 176 * returns ptr to static buffer; not reentrant!
root@mbed.org 0:5e1631496985 177 *
root@mbed.org 0:5e1631496985 178 * @param addr ip address in network order to convert
root@mbed.org 0:5e1631496985 179 * @return pointer to a global static (!) buffer that holds the ASCII
root@mbed.org 0:5e1631496985 180 * represenation of addr
root@mbed.org 0:5e1631496985 181 */
root@mbed.org 0:5e1631496985 182 char *
root@mbed.org 0:5e1631496985 183 inet_ntoa(struct in_addr addr)
root@mbed.org 0:5e1631496985 184 {
root@mbed.org 0:5e1631496985 185 static char str[16];
root@mbed.org 0:5e1631496985 186 u32_t s_addr = addr.s_addr;
root@mbed.org 0:5e1631496985 187 char inv[3];
root@mbed.org 0:5e1631496985 188 char *rp;
root@mbed.org 0:5e1631496985 189 u8_t *ap;
root@mbed.org 0:5e1631496985 190 u8_t rem;
root@mbed.org 0:5e1631496985 191 u8_t n;
root@mbed.org 0:5e1631496985 192 u8_t i;
root@mbed.org 0:5e1631496985 193
root@mbed.org 0:5e1631496985 194 rp = str;
root@mbed.org 0:5e1631496985 195 ap = (u8_t *)&s_addr;
root@mbed.org 0:5e1631496985 196 for(n = 0; n < 4; n++) {
root@mbed.org 0:5e1631496985 197 i = 0;
root@mbed.org 0:5e1631496985 198 do {
root@mbed.org 0:5e1631496985 199 rem = *ap % (u8_t)10;
root@mbed.org 0:5e1631496985 200 *ap /= (u8_t)10;
root@mbed.org 0:5e1631496985 201 inv[i++] = '0' + rem;
root@mbed.org 0:5e1631496985 202 } while(*ap);
root@mbed.org 0:5e1631496985 203 while(i--)
root@mbed.org 0:5e1631496985 204 *rp++ = inv[i];
root@mbed.org 0:5e1631496985 205 *rp++ = '.';
root@mbed.org 0:5e1631496985 206 ap++;
root@mbed.org 0:5e1631496985 207 }
root@mbed.org 0:5e1631496985 208 *--rp = 0;
root@mbed.org 0:5e1631496985 209 return str;
root@mbed.org 0:5e1631496985 210 }
root@mbed.org 0:5e1631496985 211
root@mbed.org 0:5e1631496985 212 /**
root@mbed.org 0:5e1631496985 213 * These are reference implementations of the byte swapping functions.
root@mbed.org 0:5e1631496985 214 * Again with the aim of being simple, correct and fully portable.
root@mbed.org 0:5e1631496985 215 * Byte swapping is the second thing you would want to optimize. You will
root@mbed.org 0:5e1631496985 216 * need to port it to your architecture and in your cc.h:
root@mbed.org 0:5e1631496985 217 *
root@mbed.org 0:5e1631496985 218 * #define LWIP_PLATFORM_BYTESWAP 1
root@mbed.org 0:5e1631496985 219 * #define LWIP_PLATFORM_HTONS(x) <your_htons>
root@mbed.org 0:5e1631496985 220 * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
root@mbed.org 0:5e1631496985 221 *
root@mbed.org 0:5e1631496985 222 * Note ntohs() and ntohl() are merely references to the htonx counterparts.
root@mbed.org 0:5e1631496985 223 */
root@mbed.org 0:5e1631496985 224
root@mbed.org 0:5e1631496985 225 #if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
root@mbed.org 0:5e1631496985 226
root@mbed.org 0:5e1631496985 227 /**
root@mbed.org 0:5e1631496985 228 * Convert an u16_t from host- to network byte order.
root@mbed.org 0:5e1631496985 229 *
root@mbed.org 0:5e1631496985 230 * @param n u16_t in host byte order
root@mbed.org 0:5e1631496985 231 * @return n in network byte order
root@mbed.org 0:5e1631496985 232 */
root@mbed.org 0:5e1631496985 233 u16_t
root@mbed.org 0:5e1631496985 234 htons(u16_t n)
root@mbed.org 0:5e1631496985 235 {
root@mbed.org 0:5e1631496985 236 return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
root@mbed.org 0:5e1631496985 237 }
root@mbed.org 0:5e1631496985 238
root@mbed.org 0:5e1631496985 239 /**
root@mbed.org 0:5e1631496985 240 * Convert an u16_t from network- to host byte order.
root@mbed.org 0:5e1631496985 241 *
root@mbed.org 0:5e1631496985 242 * @param n u16_t in network byte order
root@mbed.org 0:5e1631496985 243 * @return n in host byte order
root@mbed.org 0:5e1631496985 244 */
root@mbed.org 0:5e1631496985 245 u16_t
root@mbed.org 0:5e1631496985 246 ntohs(u16_t n)
root@mbed.org 0:5e1631496985 247 {
root@mbed.org 0:5e1631496985 248 return htons(n);
root@mbed.org 0:5e1631496985 249 }
root@mbed.org 0:5e1631496985 250
root@mbed.org 0:5e1631496985 251 /**
root@mbed.org 0:5e1631496985 252 * Convert an u32_t from host- to network byte order.
root@mbed.org 0:5e1631496985 253 *
root@mbed.org 0:5e1631496985 254 * @param n u32_t in host byte order
root@mbed.org 0:5e1631496985 255 * @return n in network byte order
root@mbed.org 0:5e1631496985 256 */
root@mbed.org 0:5e1631496985 257 u32_t
root@mbed.org 0:5e1631496985 258 htonl(u32_t n)
root@mbed.org 0:5e1631496985 259 {
root@mbed.org 0:5e1631496985 260 return ((n & 0xff) << 24) |
root@mbed.org 0:5e1631496985 261 ((n & 0xff00) << 8) |
root@mbed.org 0:5e1631496985 262 ((n & 0xff0000UL) >> 8) |
root@mbed.org 0:5e1631496985 263 ((n & 0xff000000UL) >> 24);
root@mbed.org 0:5e1631496985 264 }
root@mbed.org 0:5e1631496985 265
root@mbed.org 0:5e1631496985 266 /**
root@mbed.org 0:5e1631496985 267 * Convert an u32_t from network- to host byte order.
root@mbed.org 0:5e1631496985 268 *
root@mbed.org 0:5e1631496985 269 * @param n u32_t in network byte order
root@mbed.org 0:5e1631496985 270 * @return n in host byte order
root@mbed.org 0:5e1631496985 271 */
root@mbed.org 0:5e1631496985 272 u32_t
root@mbed.org 0:5e1631496985 273 ntohl(u32_t n)
root@mbed.org 0:5e1631496985 274 {
root@mbed.org 0:5e1631496985 275 return htonl(n);
root@mbed.org 0:5e1631496985 276 }
root@mbed.org 0:5e1631496985 277
root@mbed.org 0:5e1631496985 278 #endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */