Rod Coleman / NetServices

Netservices modded to read fragmented HTTP respsonse/payload from special purpose server - 180 bytes only

lwip/core/ipv4/ip_addr.c@0:8f5825f330b0, 2011-09-08 (annotated)

Committer:
RodColeman
Date:
Thu Sep 08 10:41:36 2011 +0000
Revision:
0:8f5825f330b0
setDataLen hacked to 180bytes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RodColeman 0:8f5825f330b0 1 /**
RodColeman 0:8f5825f330b0 2 * @file
RodColeman 0:8f5825f330b0 3 * This is the IPv4 address tools implementation.
RodColeman 0:8f5825f330b0 4 *
RodColeman 0:8f5825f330b0 5 */
RodColeman 0:8f5825f330b0 6
RodColeman 0:8f5825f330b0 7 /*
RodColeman 0:8f5825f330b0 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
RodColeman 0:8f5825f330b0 9 * All rights reserved.
RodColeman 0:8f5825f330b0 10 *
RodColeman 0:8f5825f330b0 11 * Redistribution and use in source and binary forms, with or without modification,
RodColeman 0:8f5825f330b0 12 * are permitted provided that the following conditions are met:
RodColeman 0:8f5825f330b0 13 *
RodColeman 0:8f5825f330b0 14 * 1. Redistributions of source code must retain the above copyright notice,
RodColeman 0:8f5825f330b0 15 * this list of conditions and the following disclaimer.
RodColeman 0:8f5825f330b0 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
RodColeman 0:8f5825f330b0 17 * this list of conditions and the following disclaimer in the documentation
RodColeman 0:8f5825f330b0 18 * and/or other materials provided with the distribution.
RodColeman 0:8f5825f330b0 19 * 3. The name of the author may not be used to endorse or promote products
RodColeman 0:8f5825f330b0 20 * derived from this software without specific prior written permission.
RodColeman 0:8f5825f330b0 21 *
RodColeman 0:8f5825f330b0 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
RodColeman 0:8f5825f330b0 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
RodColeman 0:8f5825f330b0 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
RodColeman 0:8f5825f330b0 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
RodColeman 0:8f5825f330b0 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
RodColeman 0:8f5825f330b0 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
RodColeman 0:8f5825f330b0 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
RodColeman 0:8f5825f330b0 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
RodColeman 0:8f5825f330b0 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
RodColeman 0:8f5825f330b0 31 * OF SUCH DAMAGE.
RodColeman 0:8f5825f330b0 32 *
RodColeman 0:8f5825f330b0 33 * This file is part of the lwIP TCP/IP stack.
RodColeman 0:8f5825f330b0 34 *
RodColeman 0:8f5825f330b0 35 * Author: Adam Dunkels <adam@sics.se>
RodColeman 0:8f5825f330b0 36 *
RodColeman 0:8f5825f330b0 37 */
RodColeman 0:8f5825f330b0 38
RodColeman 0:8f5825f330b0 39 #include "lwip/opt.h"
RodColeman 0:8f5825f330b0 40 #include "lwip/ip_addr.h"
RodColeman 0:8f5825f330b0 41 #include "lwip/netif.h"
RodColeman 0:8f5825f330b0 42
RodColeman 0:8f5825f330b0 43 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
RodColeman 0:8f5825f330b0 44 const ip_addr_t ip_addr_any = { IPADDR_ANY };
RodColeman 0:8f5825f330b0 45 const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
RodColeman 0:8f5825f330b0 46
RodColeman 0:8f5825f330b0 47 /**
RodColeman 0:8f5825f330b0 48 * Determine if an address is a broadcast address on a network interface
RodColeman 0:8f5825f330b0 49 *
RodColeman 0:8f5825f330b0 50 * @param addr address to be checked
RodColeman 0:8f5825f330b0 51 * @param netif the network interface against which the address is checked
RodColeman 0:8f5825f330b0 52 * @return returns non-zero if the address is a broadcast address
RodColeman 0:8f5825f330b0 53 */
RodColeman 0:8f5825f330b0 54 u8_t
RodColeman 0:8f5825f330b0 55 ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
RodColeman 0:8f5825f330b0 56 {
RodColeman 0:8f5825f330b0 57 ip_addr_t ipaddr;
RodColeman 0:8f5825f330b0 58 ip4_addr_set_u32(&ipaddr, addr);
RodColeman 0:8f5825f330b0 59
RodColeman 0:8f5825f330b0 60 /* all ones (broadcast) or all zeroes (old skool broadcast) */
RodColeman 0:8f5825f330b0 61 if ((~addr == IPADDR_ANY) ||
RodColeman 0:8f5825f330b0 62 (addr == IPADDR_ANY)) {
RodColeman 0:8f5825f330b0 63 return 1;
RodColeman 0:8f5825f330b0 64 /* no broadcast support on this network interface? */
RodColeman 0:8f5825f330b0 65 } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
RodColeman 0:8f5825f330b0 66 /* the given address cannot be a broadcast address
RodColeman 0:8f5825f330b0 67 * nor can we check against any broadcast addresses */
RodColeman 0:8f5825f330b0 68 return 0;
RodColeman 0:8f5825f330b0 69 /* address matches network interface address exactly? => no broadcast */
RodColeman 0:8f5825f330b0 70 } else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
RodColeman 0:8f5825f330b0 71 return 0;
RodColeman 0:8f5825f330b0 72 /* on the same (sub) network... */
RodColeman 0:8f5825f330b0 73 } else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
RodColeman 0:8f5825f330b0 74 /* ...and host identifier bits are all ones? =>... */
RodColeman 0:8f5825f330b0 75 && ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
RodColeman 0:8f5825f330b0 76 (IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
RodColeman 0:8f5825f330b0 77 /* => network broadcast address */
RodColeman 0:8f5825f330b0 78 return 1;
RodColeman 0:8f5825f330b0 79 } else {
RodColeman 0:8f5825f330b0 80 return 0;
RodColeman 0:8f5825f330b0 81 }
RodColeman 0:8f5825f330b0 82 }
RodColeman 0:8f5825f330b0 83
RodColeman 0:8f5825f330b0 84 /** Checks if a netmask is valid (starting with ones, then only zeros)
RodColeman 0:8f5825f330b0 85 *
RodColeman 0:8f5825f330b0 86 * @param netmask the IPv4 netmask to check (in network byte order!)
RodColeman 0:8f5825f330b0 87 * @return 1 if the netmask is valid, 0 if it is not
RodColeman 0:8f5825f330b0 88 */
RodColeman 0:8f5825f330b0 89 u8_t
RodColeman 0:8f5825f330b0 90 ip4_addr_netmask_valid(u32_t netmask)
RodColeman 0:8f5825f330b0 91 {
RodColeman 0:8f5825f330b0 92 u32_t mask;
RodColeman 0:8f5825f330b0 93 u32_t nm_hostorder = lwip_htonl(netmask);
RodColeman 0:8f5825f330b0 94
RodColeman 0:8f5825f330b0 95 /* first, check for the first zero */
RodColeman 0:8f5825f330b0 96 for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
RodColeman 0:8f5825f330b0 97 if ((nm_hostorder & mask) == 0) {
RodColeman 0:8f5825f330b0 98 break;
RodColeman 0:8f5825f330b0 99 }
RodColeman 0:8f5825f330b0 100 }
RodColeman 0:8f5825f330b0 101 /* then check that there is no one */
RodColeman 0:8f5825f330b0 102 for (; mask != 0; mask >>= 1) {
RodColeman 0:8f5825f330b0 103 if ((nm_hostorder & mask) != 0) {
RodColeman 0:8f5825f330b0 104 /* there is a one after the first zero -> invalid */
RodColeman 0:8f5825f330b0 105 return 0;
RodColeman 0:8f5825f330b0 106 }
RodColeman 0:8f5825f330b0 107 }
RodColeman 0:8f5825f330b0 108 /* no one after the first zero -> valid */
RodColeman 0:8f5825f330b0 109 return 1;
RodColeman 0:8f5825f330b0 110 }
RodColeman 0:8f5825f330b0 111
RodColeman 0:8f5825f330b0 112 /* Here for now until needed in other places in lwIP */
RodColeman 0:8f5825f330b0 113 #ifndef isprint
RodColeman 0:8f5825f330b0 114 #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
RodColeman 0:8f5825f330b0 115 #define isprint(c) in_range(c, 0x20, 0x7f)
RodColeman 0:8f5825f330b0 116 #define isdigit(c) in_range(c, '0', '9')
RodColeman 0:8f5825f330b0 117 #define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
RodColeman 0:8f5825f330b0 118 #define islower(c) in_range(c, 'a', 'z')
RodColeman 0:8f5825f330b0 119 #define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
RodColeman 0:8f5825f330b0 120 #endif
RodColeman 0:8f5825f330b0 121
RodColeman 0:8f5825f330b0 122 /**
RodColeman 0:8f5825f330b0 123 * Ascii internet address interpretation routine.
RodColeman 0:8f5825f330b0 124 * The value returned is in network order.
RodColeman 0:8f5825f330b0 125 *
RodColeman 0:8f5825f330b0 126 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
RodColeman 0:8f5825f330b0 127 * @return ip address in network order
RodColeman 0:8f5825f330b0 128 */
RodColeman 0:8f5825f330b0 129 u32_t
RodColeman 0:8f5825f330b0 130 ipaddr_addr(const char *cp)
RodColeman 0:8f5825f330b0 131 {
RodColeman 0:8f5825f330b0 132 ip_addr_t val;
RodColeman 0:8f5825f330b0 133
RodColeman 0:8f5825f330b0 134 if (ipaddr_aton(cp, &val)) {
RodColeman 0:8f5825f330b0 135 return ip4_addr_get_u32(&val);
RodColeman 0:8f5825f330b0 136 }
RodColeman 0:8f5825f330b0 137 return (IPADDR_NONE);
RodColeman 0:8f5825f330b0 138 }
RodColeman 0:8f5825f330b0 139
RodColeman 0:8f5825f330b0 140 /**
RodColeman 0:8f5825f330b0 141 * Check whether "cp" is a valid ascii representation
RodColeman 0:8f5825f330b0 142 * of an Internet address and convert to a binary address.
RodColeman 0:8f5825f330b0 143 * Returns 1 if the address is valid, 0 if not.
RodColeman 0:8f5825f330b0 144 * This replaces inet_addr, the return value from which
RodColeman 0:8f5825f330b0 145 * cannot distinguish between failure and a local broadcast address.
RodColeman 0:8f5825f330b0 146 *
RodColeman 0:8f5825f330b0 147 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
RodColeman 0:8f5825f330b0 148 * @param addr pointer to which to save the ip address in network order
RodColeman 0:8f5825f330b0 149 * @return 1 if cp could be converted to addr, 0 on failure
RodColeman 0:8f5825f330b0 150 */
RodColeman 0:8f5825f330b0 151 int
RodColeman 0:8f5825f330b0 152 ipaddr_aton(const char *cp, ip_addr_t *addr)
RodColeman 0:8f5825f330b0 153 {
RodColeman 0:8f5825f330b0 154 u32_t val;
RodColeman 0:8f5825f330b0 155 u8_t base;
RodColeman 0:8f5825f330b0 156 char c;
RodColeman 0:8f5825f330b0 157 u32_t parts[4];
RodColeman 0:8f5825f330b0 158 u32_t *pp = parts;
RodColeman 0:8f5825f330b0 159
RodColeman 0:8f5825f330b0 160 c = *cp;
RodColeman 0:8f5825f330b0 161 for (;;) {
RodColeman 0:8f5825f330b0 162 /*
RodColeman 0:8f5825f330b0 163 * Collect number up to ``.''.
RodColeman 0:8f5825f330b0 164 * Values are specified as for C:
RodColeman 0:8f5825f330b0 165 * 0x=hex, 0=octal, 1-9=decimal.
RodColeman 0:8f5825f330b0 166 */
RodColeman 0:8f5825f330b0 167 if (!isdigit(c))
RodColeman 0:8f5825f330b0 168 return (0);
RodColeman 0:8f5825f330b0 169 val = 0;
RodColeman 0:8f5825f330b0 170 base = 10;
RodColeman 0:8f5825f330b0 171 if (c == '0') {
RodColeman 0:8f5825f330b0 172 c = *++cp;
RodColeman 0:8f5825f330b0 173 if (c == 'x' || c == 'X') {
RodColeman 0:8f5825f330b0 174 base = 16;
RodColeman 0:8f5825f330b0 175 c = *++cp;
RodColeman 0:8f5825f330b0 176 } else
RodColeman 0:8f5825f330b0 177 base = 8;
RodColeman 0:8f5825f330b0 178 }
RodColeman 0:8f5825f330b0 179 for (;;) {
RodColeman 0:8f5825f330b0 180 if (isdigit(c)) {
RodColeman 0:8f5825f330b0 181 val = (val * base) + (int)(c - '0');
RodColeman 0:8f5825f330b0 182 c = *++cp;
RodColeman 0:8f5825f330b0 183 } else if (base == 16 && isxdigit(c)) {
RodColeman 0:8f5825f330b0 184 val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
RodColeman 0:8f5825f330b0 185 c = *++cp;
RodColeman 0:8f5825f330b0 186 } else
RodColeman 0:8f5825f330b0 187 break;
RodColeman 0:8f5825f330b0 188 }
RodColeman 0:8f5825f330b0 189 if (c == '.') {
RodColeman 0:8f5825f330b0 190 /*
RodColeman 0:8f5825f330b0 191 * Internet format:
RodColeman 0:8f5825f330b0 192 * a.b.c.d
RodColeman 0:8f5825f330b0 193 * a.b.c (with c treated as 16 bits)
RodColeman 0:8f5825f330b0 194 * a.b (with b treated as 24 bits)
RodColeman 0:8f5825f330b0 195 */
RodColeman 0:8f5825f330b0 196 if (pp >= parts + 3) {
RodColeman 0:8f5825f330b0 197 return (0);
RodColeman 0:8f5825f330b0 198 }
RodColeman 0:8f5825f330b0 199 *pp++ = val;
RodColeman 0:8f5825f330b0 200 c = *++cp;
RodColeman 0:8f5825f330b0 201 } else
RodColeman 0:8f5825f330b0 202 break;
RodColeman 0:8f5825f330b0 203 }
RodColeman 0:8f5825f330b0 204 /*
RodColeman 0:8f5825f330b0 205 * Check for trailing characters.
RodColeman 0:8f5825f330b0 206 */
RodColeman 0:8f5825f330b0 207 if (c != '\0' && !isspace(c)) {
RodColeman 0:8f5825f330b0 208 return (0);
RodColeman 0:8f5825f330b0 209 }
RodColeman 0:8f5825f330b0 210 /*
RodColeman 0:8f5825f330b0 211 * Concoct the address according to
RodColeman 0:8f5825f330b0 212 * the number of parts specified.
RodColeman 0:8f5825f330b0 213 */
RodColeman 0:8f5825f330b0 214 switch (pp - parts + 1) {
RodColeman 0:8f5825f330b0 215
RodColeman 0:8f5825f330b0 216 case 0:
RodColeman 0:8f5825f330b0 217 return (0); /* initial nondigit */
RodColeman 0:8f5825f330b0 218
RodColeman 0:8f5825f330b0 219 case 1: /* a -- 32 bits */
RodColeman 0:8f5825f330b0 220 break;
RodColeman 0:8f5825f330b0 221
RodColeman 0:8f5825f330b0 222 case 2: /* a.b -- 8.24 bits */
RodColeman 0:8f5825f330b0 223 if (val > 0xffffffUL) {
RodColeman 0:8f5825f330b0 224 return (0);
RodColeman 0:8f5825f330b0 225 }
RodColeman 0:8f5825f330b0 226 val |= parts[0] << 24;
RodColeman 0:8f5825f330b0 227 break;
RodColeman 0:8f5825f330b0 228
RodColeman 0:8f5825f330b0 229 case 3: /* a.b.c -- 8.8.16 bits */
RodColeman 0:8f5825f330b0 230 if (val > 0xffff) {
RodColeman 0:8f5825f330b0 231 return (0);
RodColeman 0:8f5825f330b0 232 }
RodColeman 0:8f5825f330b0 233 val |= (parts[0] << 24) | (parts[1] << 16);
RodColeman 0:8f5825f330b0 234 break;
RodColeman 0:8f5825f330b0 235
RodColeman 0:8f5825f330b0 236 case 4: /* a.b.c.d -- 8.8.8.8 bits */
RodColeman 0:8f5825f330b0 237 if (val > 0xff) {
RodColeman 0:8f5825f330b0 238 return (0);
RodColeman 0:8f5825f330b0 239 }
RodColeman 0:8f5825f330b0 240 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
RodColeman 0:8f5825f330b0 241 break;
RodColeman 0:8f5825f330b0 242 default:
RodColeman 0:8f5825f330b0 243 LWIP_ASSERT("unhandled", 0);
RodColeman 0:8f5825f330b0 244 break;
RodColeman 0:8f5825f330b0 245 }
RodColeman 0:8f5825f330b0 246 if (addr) {
RodColeman 0:8f5825f330b0 247 ip4_addr_set_u32(addr, htonl(val));
RodColeman 0:8f5825f330b0 248 }
RodColeman 0:8f5825f330b0 249 return (1);
RodColeman 0:8f5825f330b0 250 }
RodColeman 0:8f5825f330b0 251
RodColeman 0:8f5825f330b0 252 /**
RodColeman 0:8f5825f330b0 253 * Convert numeric IP address into decimal dotted ASCII representation.
RodColeman 0:8f5825f330b0 254 * returns ptr to static buffer; not reentrant!
RodColeman 0:8f5825f330b0 255 *
RodColeman 0:8f5825f330b0 256 * @param addr ip address in network order to convert
RodColeman 0:8f5825f330b0 257 * @return pointer to a global static (!) buffer that holds the ASCII
RodColeman 0:8f5825f330b0 258 * represenation of addr
RodColeman 0:8f5825f330b0 259 */
RodColeman 0:8f5825f330b0 260 char *
RodColeman 0:8f5825f330b0 261 ipaddr_ntoa(const ip_addr_t *addr)
RodColeman 0:8f5825f330b0 262 {
RodColeman 0:8f5825f330b0 263 static char str[16];
RodColeman 0:8f5825f330b0 264 return ipaddr_ntoa_r(addr, str, 16);
RodColeman 0:8f5825f330b0 265 }
RodColeman 0:8f5825f330b0 266
RodColeman 0:8f5825f330b0 267 /**
RodColeman 0:8f5825f330b0 268 * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
RodColeman 0:8f5825f330b0 269 *
RodColeman 0:8f5825f330b0 270 * @param addr ip address in network order to convert
RodColeman 0:8f5825f330b0 271 * @param buf target buffer where the string is stored
RodColeman 0:8f5825f330b0 272 * @param buflen length of buf
RodColeman 0:8f5825f330b0 273 * @return either pointer to buf which now holds the ASCII
RodColeman 0:8f5825f330b0 274 * representation of addr or NULL if buf was too small
RodColeman 0:8f5825f330b0 275 */
RodColeman 0:8f5825f330b0 276 char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
RodColeman 0:8f5825f330b0 277 {
RodColeman 0:8f5825f330b0 278 u32_t s_addr;
RodColeman 0:8f5825f330b0 279 char inv[3];
RodColeman 0:8f5825f330b0 280 char *rp;
RodColeman 0:8f5825f330b0 281 u8_t *ap;
RodColeman 0:8f5825f330b0 282 u8_t rem;
RodColeman 0:8f5825f330b0 283 u8_t n;
RodColeman 0:8f5825f330b0 284 u8_t i;
RodColeman 0:8f5825f330b0 285 int len = 0;
RodColeman 0:8f5825f330b0 286
RodColeman 0:8f5825f330b0 287 s_addr = ip4_addr_get_u32(addr);
RodColeman 0:8f5825f330b0 288
RodColeman 0:8f5825f330b0 289 rp = buf;
RodColeman 0:8f5825f330b0 290 ap = (u8_t *)&s_addr;
RodColeman 0:8f5825f330b0 291 for(n = 0; n < 4; n++) {
RodColeman 0:8f5825f330b0 292 i = 0;
RodColeman 0:8f5825f330b0 293 do {
RodColeman 0:8f5825f330b0 294 rem = *ap % (u8_t)10;
RodColeman 0:8f5825f330b0 295 *ap /= (u8_t)10;
RodColeman 0:8f5825f330b0 296 inv[i++] = '0' + rem;
RodColeman 0:8f5825f330b0 297 } while(*ap);
RodColeman 0:8f5825f330b0 298 while(i--) {
RodColeman 0:8f5825f330b0 299 if (len++ >= buflen) {
RodColeman 0:8f5825f330b0 300 return NULL;
RodColeman 0:8f5825f330b0 301 }
RodColeman 0:8f5825f330b0 302 *rp++ = inv[i];
RodColeman 0:8f5825f330b0 303 }
RodColeman 0:8f5825f330b0 304 if (len++ >= buflen) {
RodColeman 0:8f5825f330b0 305 return NULL;
RodColeman 0:8f5825f330b0 306 }
RodColeman 0:8f5825f330b0 307 *rp++ = '.';
RodColeman 0:8f5825f330b0 308 ap++;
RodColeman 0:8f5825f330b0 309 }
RodColeman 0:8f5825f330b0 310 *--rp = 0;
RodColeman 0:8f5825f330b0 311 return buf;
RodColeman 0:8f5825f330b0 312 }