X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=blobdiff_plain;f=geekos%2Fsrc%2Flwip%2Fcore%2Fipv4%2Finet.c;fp=geekos%2Fsrc%2Flwip%2Fcore%2Fipv4%2Finet.c;h=24c7ff46919582a0b93595c82abe1e1762f134d1;hp=0000000000000000000000000000000000000000;hb=ddc16b0737cf58f7aa90a69c6652cdf4090aec51;hpb=626595465a2c6987606a6bc697df65130ad8c2d3 diff --git a/geekos/src/lwip/core/ipv4/inet.c b/geekos/src/lwip/core/ipv4/inet.c new file mode 100644 index 0000000..24c7ff4 --- /dev/null +++ b/geekos/src/lwip/core/ipv4/inet.c @@ -0,0 +1,278 @@ +/** + * @file + * Functions common to all TCP/IPv4 modules, such as the byte order functions. + * + */ + +/* + * Copyright (c) 2001-2004 Swedish Institute of Computer Science. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * This file is part of the lwIP TCP/IP stack. + * + * Author: Adam Dunkels + * + */ + +#include "lwip/opt.h" + +#include "lwip/inet.h" + +/* Here for now until needed in other places in lwIP */ +#ifndef isprint +#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up) +#define isprint(c) in_range(c, 0x20, 0x7f) +#define isdigit(c) in_range(c, '0', '9') +#define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F')) +#define islower(c) in_range(c, 'a', 'z') +#define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v') +#endif + +/** + * Ascii internet address interpretation routine. + * The value returned is in network order. + * + * @param cp IP address in ascii represenation (e.g. "127.0.0.1") + * @return ip address in network order + */ +u32_t +inet_addr(const char *cp) +{ + struct in_addr val; + + if (inet_aton(cp, &val)) { + return (val.s_addr); + } + return (INADDR_NONE); +} + +/** + * Check whether "cp" is a valid ascii representation + * of an Internet address and convert to a binary address. + * Returns 1 if the address is valid, 0 if not. + * This replaces inet_addr, the return value from which + * cannot distinguish between failure and a local broadcast address. + * + * @param cp IP address in ascii represenation (e.g. "127.0.0.1") + * @param addr pointer to which to save the ip address in network order + * @return 1 if cp could be converted to addr, 0 on failure + */ +int +inet_aton(const char *cp, struct in_addr *addr) +{ + u32_t val; + int base, n, c; + u32_t parts[4]; + u32_t *pp = parts; + + c = *cp; + for (;;) { + /* + * Collect number up to ``.''. + * Values are specified as for C: + * 0x=hex, 0=octal, 1-9=decimal. + */ + if (!isdigit(c)) + return (0); + val = 0; + base = 10; + if (c == '0') { + c = *++cp; + if (c == 'x' || c == 'X') { + base = 16; + c = *++cp; + } else + base = 8; + } + for (;;) { + if (isdigit(c)) { + val = (val * base) + (int)(c - '0'); + c = *++cp; + } else if (base == 16 && isxdigit(c)) { + val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A')); + c = *++cp; + } else + break; + } + if (c == '.') { + /* + * Internet format: + * a.b.c.d + * a.b.c (with c treated as 16 bits) + * a.b (with b treated as 24 bits) + */ + if (pp >= parts + 3) + return (0); + *pp++ = val; + c = *++cp; + } else + break; + } + /* + * Check for trailing characters. + */ + if (c != '\0' && (!isprint(c) || !isspace(c))) + return (0); + /* + * Concoct the address according to + * the number of parts specified. + */ + n = pp - parts + 1; + switch (n) { + + case 0: + return (0); /* initial nondigit */ + + case 1: /* a -- 32 bits */ + break; + + case 2: /* a.b -- 8.24 bits */ + if (val > 0xffffffUL) + return (0); + val |= parts[0] << 24; + break; + + case 3: /* a.b.c -- 8.8.16 bits */ + if (val > 0xffff) + return (0); + val |= (parts[0] << 24) | (parts[1] << 16); + break; + + case 4: /* a.b.c.d -- 8.8.8.8 bits */ + if (val > 0xff) + return (0); + val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); + break; + } + if (addr) + addr->s_addr = htonl(val); + return (1); +} + +/** + * Convert numeric IP address into decimal dotted ASCII representation. + * returns ptr to static buffer; not reentrant! + * + * @param addr ip address in network order to convert + * @return pointer to a global static (!) buffer that holds the ASCII + * represenation of addr + */ +char * +inet_ntoa(struct in_addr addr) +{ + static char str[16]; + u32_t s_addr = addr.s_addr; + char inv[3]; + char *rp; + u8_t *ap; + u8_t rem; + u8_t n; + u8_t i; + + rp = str; + ap = (u8_t *)&s_addr; + for(n = 0; n < 4; n++) { + i = 0; + do { + rem = *ap % (u8_t)10; + *ap /= (u8_t)10; + inv[i++] = '0' + rem; + } while(*ap); + while(i--) + *rp++ = inv[i]; + *rp++ = '.'; + ap++; + } + *--rp = 0; + return str; +} + +/** + * These are reference implementations of the byte swapping functions. + * Again with the aim of being simple, correct and fully portable. + * Byte swapping is the second thing you would want to optimize. You will + * need to port it to your architecture and in your cc.h: + * + * #define LWIP_PLATFORM_BYTESWAP 1 + * #define LWIP_PLATFORM_HTONS(x) + * #define LWIP_PLATFORM_HTONL(x) + * + * Note ntohs() and ntohl() are merely references to the htonx counterparts. + */ + +#if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) + +/** + * Convert an u16_t from host- to network byte order. + * + * @param n u16_t in host byte order + * @return n in network byte order + */ +u16_t +htons(u16_t n) +{ + return ((n & 0xff) << 8) | ((n & 0xff00) >> 8); +} + +/** + * Convert an u16_t from network- to host byte order. + * + * @param n u16_t in network byte order + * @return n in host byte order + */ +u16_t +ntohs(u16_t n) +{ + return htons(n); +} + +/** + * Convert an u32_t from host- to network byte order. + * + * @param n u32_t in host byte order + * @return n in network byte order + */ +u32_t +htonl(u32_t n) +{ + return ((n & 0xff) << 24) | + ((n & 0xff00) << 8) | + ((n & 0xff0000UL) >> 8) | + ((n & 0xff000000UL) >> 24); +} + +/** + * Convert an u32_t from network- to host byte order. + * + * @param n u32_t in network byte order + * @return n in host byte order + */ +u32_t +ntohl(u32_t n) +{ + return htonl(n); +} + +#endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */