Yasushi TAUCHI / Mbed 2 deprecated giken9_HTMLServer_Sample

ソースの整理中ですが、利用はできます。

Dependencies:   EthernetInterface HttpServer TextLCD mbed-rpc mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/ipv4/ip_addr.c@0:7766f6712673, 2014-03-12 (annotated)

Committer:
yueee_yt
Date:
Wed Mar 12 04:19:54 2014 +0000
Revision:
0:7766f6712673
???????????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yueee_yt 0:7766f6712673 1 /**
yueee_yt 0:7766f6712673 2 * @file
yueee_yt 0:7766f6712673 3 * This is the IPv4 address tools implementation.
yueee_yt 0:7766f6712673 4 *
yueee_yt 0:7766f6712673 5 */
yueee_yt 0:7766f6712673 6
yueee_yt 0:7766f6712673 7 /*
yueee_yt 0:7766f6712673 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
yueee_yt 0:7766f6712673 9 * All rights reserved.
yueee_yt 0:7766f6712673 10 *
yueee_yt 0:7766f6712673 11 * Redistribution and use in source and binary forms, with or without modification,
yueee_yt 0:7766f6712673 12 * are permitted provided that the following conditions are met:
yueee_yt 0:7766f6712673 13 *
yueee_yt 0:7766f6712673 14 * 1. Redistributions of source code must retain the above copyright notice,
yueee_yt 0:7766f6712673 15 * this list of conditions and the following disclaimer.
yueee_yt 0:7766f6712673 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
yueee_yt 0:7766f6712673 17 * this list of conditions and the following disclaimer in the documentation
yueee_yt 0:7766f6712673 18 * and/or other materials provided with the distribution.
yueee_yt 0:7766f6712673 19 * 3. The name of the author may not be used to endorse or promote products
yueee_yt 0:7766f6712673 20 * derived from this software without specific prior written permission.
yueee_yt 0:7766f6712673 21 *
yueee_yt 0:7766f6712673 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
yueee_yt 0:7766f6712673 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
yueee_yt 0:7766f6712673 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
yueee_yt 0:7766f6712673 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
yueee_yt 0:7766f6712673 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
yueee_yt 0:7766f6712673 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
yueee_yt 0:7766f6712673 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
yueee_yt 0:7766f6712673 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
yueee_yt 0:7766f6712673 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
yueee_yt 0:7766f6712673 31 * OF SUCH DAMAGE.
yueee_yt 0:7766f6712673 32 *
yueee_yt 0:7766f6712673 33 * This file is part of the lwIP TCP/IP stack.
yueee_yt 0:7766f6712673 34 *
yueee_yt 0:7766f6712673 35 * Author: Adam Dunkels <adam@sics.se>
yueee_yt 0:7766f6712673 36 *
yueee_yt 0:7766f6712673 37 */
yueee_yt 0:7766f6712673 38
yueee_yt 0:7766f6712673 39 #include "lwip/opt.h"
yueee_yt 0:7766f6712673 40 #include "lwip/ip_addr.h"
yueee_yt 0:7766f6712673 41 #include "lwip/netif.h"
yueee_yt 0:7766f6712673 42
yueee_yt 0:7766f6712673 43 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
yueee_yt 0:7766f6712673 44 const ip_addr_t ip_addr_any = { IPADDR_ANY };
yueee_yt 0:7766f6712673 45 const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
yueee_yt 0:7766f6712673 46
yueee_yt 0:7766f6712673 47 /**
yueee_yt 0:7766f6712673 48 * Determine if an address is a broadcast address on a network interface
yueee_yt 0:7766f6712673 49 *
yueee_yt 0:7766f6712673 50 * @param addr address to be checked
yueee_yt 0:7766f6712673 51 * @param netif the network interface against which the address is checked
yueee_yt 0:7766f6712673 52 * @return returns non-zero if the address is a broadcast address
yueee_yt 0:7766f6712673 53 */
yueee_yt 0:7766f6712673 54 u8_t
yueee_yt 0:7766f6712673 55 ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
yueee_yt 0:7766f6712673 56 {
yueee_yt 0:7766f6712673 57 ip_addr_t ipaddr;
yueee_yt 0:7766f6712673 58 ip4_addr_set_u32(&ipaddr, addr);
yueee_yt 0:7766f6712673 59
yueee_yt 0:7766f6712673 60 /* all ones (broadcast) or all zeroes (old skool broadcast) */
yueee_yt 0:7766f6712673 61 if ((~addr == IPADDR_ANY) ||
yueee_yt 0:7766f6712673 62 (addr == IPADDR_ANY)) {
yueee_yt 0:7766f6712673 63 return 1;
yueee_yt 0:7766f6712673 64 /* no broadcast support on this network interface? */
yueee_yt 0:7766f6712673 65 } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
yueee_yt 0:7766f6712673 66 /* the given address cannot be a broadcast address
yueee_yt 0:7766f6712673 67 * nor can we check against any broadcast addresses */
yueee_yt 0:7766f6712673 68 return 0;
yueee_yt 0:7766f6712673 69 /* address matches network interface address exactly? => no broadcast */
yueee_yt 0:7766f6712673 70 } else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
yueee_yt 0:7766f6712673 71 return 0;
yueee_yt 0:7766f6712673 72 /* on the same (sub) network... */
yueee_yt 0:7766f6712673 73 } else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
yueee_yt 0:7766f6712673 74 /* ...and host identifier bits are all ones? =>... */
yueee_yt 0:7766f6712673 75 && ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
yueee_yt 0:7766f6712673 76 (IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
yueee_yt 0:7766f6712673 77 /* => network broadcast address */
yueee_yt 0:7766f6712673 78 return 1;
yueee_yt 0:7766f6712673 79 } else {
yueee_yt 0:7766f6712673 80 return 0;
yueee_yt 0:7766f6712673 81 }
yueee_yt 0:7766f6712673 82 }
yueee_yt 0:7766f6712673 83
yueee_yt 0:7766f6712673 84 /** Checks if a netmask is valid (starting with ones, then only zeros)
yueee_yt 0:7766f6712673 85 *
yueee_yt 0:7766f6712673 86 * @param netmask the IPv4 netmask to check (in network byte order!)
yueee_yt 0:7766f6712673 87 * @return 1 if the netmask is valid, 0 if it is not
yueee_yt 0:7766f6712673 88 */
yueee_yt 0:7766f6712673 89 u8_t
yueee_yt 0:7766f6712673 90 ip4_addr_netmask_valid(u32_t netmask)
yueee_yt 0:7766f6712673 91 {
yueee_yt 0:7766f6712673 92 u32_t mask;
yueee_yt 0:7766f6712673 93 u32_t nm_hostorder = lwip_htonl(netmask);
yueee_yt 0:7766f6712673 94
yueee_yt 0:7766f6712673 95 /* first, check for the first zero */
yueee_yt 0:7766f6712673 96 for (mask = 1UL << 31 ; mask != 0; mask >>= 1) {
yueee_yt 0:7766f6712673 97 if ((nm_hostorder & mask) == 0) {
yueee_yt 0:7766f6712673 98 break;
yueee_yt 0:7766f6712673 99 }
yueee_yt 0:7766f6712673 100 }
yueee_yt 0:7766f6712673 101 /* then check that there is no one */
yueee_yt 0:7766f6712673 102 for (; mask != 0; mask >>= 1) {
yueee_yt 0:7766f6712673 103 if ((nm_hostorder & mask) != 0) {
yueee_yt 0:7766f6712673 104 /* there is a one after the first zero -> invalid */
yueee_yt 0:7766f6712673 105 return 0;
yueee_yt 0:7766f6712673 106 }
yueee_yt 0:7766f6712673 107 }
yueee_yt 0:7766f6712673 108 /* no one after the first zero -> valid */
yueee_yt 0:7766f6712673 109 return 1;
yueee_yt 0:7766f6712673 110 }
yueee_yt 0:7766f6712673 111
yueee_yt 0:7766f6712673 112 /* Here for now until needed in other places in lwIP */
yueee_yt 0:7766f6712673 113 #ifndef isprint
yueee_yt 0:7766f6712673 114 #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
yueee_yt 0:7766f6712673 115 #define isprint(c) in_range(c, 0x20, 0x7f)
yueee_yt 0:7766f6712673 116 #define isdigit(c) in_range(c, '0', '9')
yueee_yt 0:7766f6712673 117 #define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
yueee_yt 0:7766f6712673 118 #define islower(c) in_range(c, 'a', 'z')
yueee_yt 0:7766f6712673 119 #define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
yueee_yt 0:7766f6712673 120 #endif
yueee_yt 0:7766f6712673 121
yueee_yt 0:7766f6712673 122 /**
yueee_yt 0:7766f6712673 123 * Ascii internet address interpretation routine.
yueee_yt 0:7766f6712673 124 * The value returned is in network order.
yueee_yt 0:7766f6712673 125 *
yueee_yt 0:7766f6712673 126 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
yueee_yt 0:7766f6712673 127 * @return ip address in network order
yueee_yt 0:7766f6712673 128 */
yueee_yt 0:7766f6712673 129 u32_t
yueee_yt 0:7766f6712673 130 ipaddr_addr(const char *cp)
yueee_yt 0:7766f6712673 131 {
yueee_yt 0:7766f6712673 132 ip_addr_t val;
yueee_yt 0:7766f6712673 133
yueee_yt 0:7766f6712673 134 if (ipaddr_aton(cp, &val)) {
yueee_yt 0:7766f6712673 135 return ip4_addr_get_u32(&val);
yueee_yt 0:7766f6712673 136 }
yueee_yt 0:7766f6712673 137 return (IPADDR_NONE);
yueee_yt 0:7766f6712673 138 }
yueee_yt 0:7766f6712673 139
yueee_yt 0:7766f6712673 140 /**
yueee_yt 0:7766f6712673 141 * Check whether "cp" is a valid ascii representation
yueee_yt 0:7766f6712673 142 * of an Internet address and convert to a binary address.
yueee_yt 0:7766f6712673 143 * Returns 1 if the address is valid, 0 if not.
yueee_yt 0:7766f6712673 144 * This replaces inet_addr, the return value from which
yueee_yt 0:7766f6712673 145 * cannot distinguish between failure and a local broadcast address.
yueee_yt 0:7766f6712673 146 *
yueee_yt 0:7766f6712673 147 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
yueee_yt 0:7766f6712673 148 * @param addr pointer to which to save the ip address in network order
yueee_yt 0:7766f6712673 149 * @return 1 if cp could be converted to addr, 0 on failure
yueee_yt 0:7766f6712673 150 */
yueee_yt 0:7766f6712673 151 int
yueee_yt 0:7766f6712673 152 ipaddr_aton(const char *cp, ip_addr_t *addr)
yueee_yt 0:7766f6712673 153 {
yueee_yt 0:7766f6712673 154 u32_t val;
yueee_yt 0:7766f6712673 155 u8_t base;
yueee_yt 0:7766f6712673 156 char c;
yueee_yt 0:7766f6712673 157 u32_t parts[4];
yueee_yt 0:7766f6712673 158 u32_t *pp = parts;
yueee_yt 0:7766f6712673 159
yueee_yt 0:7766f6712673 160 c = *cp;
yueee_yt 0:7766f6712673 161 for (;;) {
yueee_yt 0:7766f6712673 162 /*
yueee_yt 0:7766f6712673 163 * Collect number up to ``.''.
yueee_yt 0:7766f6712673 164 * Values are specified as for C:
yueee_yt 0:7766f6712673 165 * 0x=hex, 0=octal, 1-9=decimal.
yueee_yt 0:7766f6712673 166 */
yueee_yt 0:7766f6712673 167 if (!isdigit(c))
yueee_yt 0:7766f6712673 168 return (0);
yueee_yt 0:7766f6712673 169 val = 0;
yueee_yt 0:7766f6712673 170 base = 10;
yueee_yt 0:7766f6712673 171 if (c == '0') {
yueee_yt 0:7766f6712673 172 c = *++cp;
yueee_yt 0:7766f6712673 173 if (c == 'x' || c == 'X') {
yueee_yt 0:7766f6712673 174 base = 16;
yueee_yt 0:7766f6712673 175 c = *++cp;
yueee_yt 0:7766f6712673 176 } else
yueee_yt 0:7766f6712673 177 base = 8;
yueee_yt 0:7766f6712673 178 }
yueee_yt 0:7766f6712673 179 for (;;) {
yueee_yt 0:7766f6712673 180 if (isdigit(c)) {
yueee_yt 0:7766f6712673 181 val = (val * base) + (int)(c - '0');
yueee_yt 0:7766f6712673 182 c = *++cp;
yueee_yt 0:7766f6712673 183 } else if (base == 16 && isxdigit(c)) {
yueee_yt 0:7766f6712673 184 val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
yueee_yt 0:7766f6712673 185 c = *++cp;
yueee_yt 0:7766f6712673 186 } else
yueee_yt 0:7766f6712673 187 break;
yueee_yt 0:7766f6712673 188 }
yueee_yt 0:7766f6712673 189 if (c == '.') {
yueee_yt 0:7766f6712673 190 /*
yueee_yt 0:7766f6712673 191 * Internet format:
yueee_yt 0:7766f6712673 192 * a.b.c.d
yueee_yt 0:7766f6712673 193 * a.b.c (with c treated as 16 bits)
yueee_yt 0:7766f6712673 194 * a.b (with b treated as 24 bits)
yueee_yt 0:7766f6712673 195 */
yueee_yt 0:7766f6712673 196 if (pp >= parts + 3) {
yueee_yt 0:7766f6712673 197 return (0);
yueee_yt 0:7766f6712673 198 }
yueee_yt 0:7766f6712673 199 *pp++ = val;
yueee_yt 0:7766f6712673 200 c = *++cp;
yueee_yt 0:7766f6712673 201 } else
yueee_yt 0:7766f6712673 202 break;
yueee_yt 0:7766f6712673 203 }
yueee_yt 0:7766f6712673 204 /*
yueee_yt 0:7766f6712673 205 * Check for trailing characters.
yueee_yt 0:7766f6712673 206 */
yueee_yt 0:7766f6712673 207 if (c != '\0' && !isspace(c)) {
yueee_yt 0:7766f6712673 208 return (0);
yueee_yt 0:7766f6712673 209 }
yueee_yt 0:7766f6712673 210 /*
yueee_yt 0:7766f6712673 211 * Concoct the address according to
yueee_yt 0:7766f6712673 212 * the number of parts specified.
yueee_yt 0:7766f6712673 213 */
yueee_yt 0:7766f6712673 214 switch (pp - parts + 1) {
yueee_yt 0:7766f6712673 215
yueee_yt 0:7766f6712673 216 case 0:
yueee_yt 0:7766f6712673 217 return (0); /* initial nondigit */
yueee_yt 0:7766f6712673 218
yueee_yt 0:7766f6712673 219 case 1: /* a -- 32 bits */
yueee_yt 0:7766f6712673 220 break;
yueee_yt 0:7766f6712673 221
yueee_yt 0:7766f6712673 222 case 2: /* a.b -- 8.24 bits */
yueee_yt 0:7766f6712673 223 if (val > 0xffffffUL) {
yueee_yt 0:7766f6712673 224 return (0);
yueee_yt 0:7766f6712673 225 }
yueee_yt 0:7766f6712673 226 val |= parts[0] << 24;
yueee_yt 0:7766f6712673 227 break;
yueee_yt 0:7766f6712673 228
yueee_yt 0:7766f6712673 229 case 3: /* a.b.c -- 8.8.16 bits */
yueee_yt 0:7766f6712673 230 if (val > 0xffff) {
yueee_yt 0:7766f6712673 231 return (0);
yueee_yt 0:7766f6712673 232 }
yueee_yt 0:7766f6712673 233 val |= (parts[0] << 24) | (parts[1] << 16);
yueee_yt 0:7766f6712673 234 break;
yueee_yt 0:7766f6712673 235
yueee_yt 0:7766f6712673 236 case 4: /* a.b.c.d -- 8.8.8.8 bits */
yueee_yt 0:7766f6712673 237 if (val > 0xff) {
yueee_yt 0:7766f6712673 238 return (0);
yueee_yt 0:7766f6712673 239 }
yueee_yt 0:7766f6712673 240 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
yueee_yt 0:7766f6712673 241 break;
yueee_yt 0:7766f6712673 242 default:
yueee_yt 0:7766f6712673 243 LWIP_ASSERT("unhandled", 0);
yueee_yt 0:7766f6712673 244 break;
yueee_yt 0:7766f6712673 245 }
yueee_yt 0:7766f6712673 246 if (addr) {
yueee_yt 0:7766f6712673 247 ip4_addr_set_u32(addr, htonl(val));
yueee_yt 0:7766f6712673 248 }
yueee_yt 0:7766f6712673 249 return (1);
yueee_yt 0:7766f6712673 250 }
yueee_yt 0:7766f6712673 251
yueee_yt 0:7766f6712673 252 /**
yueee_yt 0:7766f6712673 253 * Convert numeric IP address into decimal dotted ASCII representation.
yueee_yt 0:7766f6712673 254 * returns ptr to static buffer; not reentrant!
yueee_yt 0:7766f6712673 255 *
yueee_yt 0:7766f6712673 256 * @param addr ip address in network order to convert
yueee_yt 0:7766f6712673 257 * @return pointer to a global static (!) buffer that holds the ASCII
yueee_yt 0:7766f6712673 258 * represenation of addr
yueee_yt 0:7766f6712673 259 */
yueee_yt 0:7766f6712673 260 char *
yueee_yt 0:7766f6712673 261 ipaddr_ntoa(const ip_addr_t *addr)
yueee_yt 0:7766f6712673 262 {
yueee_yt 0:7766f6712673 263 static char str[16];
yueee_yt 0:7766f6712673 264 return ipaddr_ntoa_r(addr, str, 16);
yueee_yt 0:7766f6712673 265 }
yueee_yt 0:7766f6712673 266
yueee_yt 0:7766f6712673 267 /**
yueee_yt 0:7766f6712673 268 * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
yueee_yt 0:7766f6712673 269 *
yueee_yt 0:7766f6712673 270 * @param addr ip address in network order to convert
yueee_yt 0:7766f6712673 271 * @param buf target buffer where the string is stored
yueee_yt 0:7766f6712673 272 * @param buflen length of buf
yueee_yt 0:7766f6712673 273 * @return either pointer to buf which now holds the ASCII
yueee_yt 0:7766f6712673 274 * representation of addr or NULL if buf was too small
yueee_yt 0:7766f6712673 275 */
yueee_yt 0:7766f6712673 276 char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
yueee_yt 0:7766f6712673 277 {
yueee_yt 0:7766f6712673 278 u32_t s_addr;
yueee_yt 0:7766f6712673 279 char inv[3];
yueee_yt 0:7766f6712673 280 char *rp;
yueee_yt 0:7766f6712673 281 u8_t *ap;
yueee_yt 0:7766f6712673 282 u8_t rem;
yueee_yt 0:7766f6712673 283 u8_t n;
yueee_yt 0:7766f6712673 284 u8_t i;
yueee_yt 0:7766f6712673 285 int len = 0;
yueee_yt 0:7766f6712673 286
yueee_yt 0:7766f6712673 287 s_addr = ip4_addr_get_u32(addr);
yueee_yt 0:7766f6712673 288
yueee_yt 0:7766f6712673 289 rp = buf;
yueee_yt 0:7766f6712673 290 ap = (u8_t *)&s_addr;
yueee_yt 0:7766f6712673 291 for(n = 0; n < 4; n++) {
yueee_yt 0:7766f6712673 292 i = 0;
yueee_yt 0:7766f6712673 293 do {
yueee_yt 0:7766f6712673 294 rem = *ap % (u8_t)10;
yueee_yt 0:7766f6712673 295 *ap /= (u8_t)10;
yueee_yt 0:7766f6712673 296 inv[i++] = '0' + rem;
yueee_yt 0:7766f6712673 297 } while(*ap);
yueee_yt 0:7766f6712673 298 while(i--) {
yueee_yt 0:7766f6712673 299 if (len++ >= buflen) {
yueee_yt 0:7766f6712673 300 return NULL;
yueee_yt 0:7766f6712673 301 }
yueee_yt 0:7766f6712673 302 *rp++ = inv[i];
yueee_yt 0:7766f6712673 303 }
yueee_yt 0:7766f6712673 304 if (len++ >= buflen) {
yueee_yt 0:7766f6712673 305 return NULL;
yueee_yt 0:7766f6712673 306 }
yueee_yt 0:7766f6712673 307 *rp++ = '.';
yueee_yt 0:7766f6712673 308 ap++;
yueee_yt 0:7766f6712673 309 }
yueee_yt 0:7766f6712673 310 *--rp = 0;
yueee_yt 0:7766f6712673 311 return buf;
yueee_yt 0:7766f6712673 312 }