1. All espressif specific code are prefix with ESP_ 2. Define all ESP_ options in lwipopts.h 3. Remove useless code added in 8266
362 lines
9.5 KiB
C
Executable file
362 lines
9.5 KiB
C
Executable file
/**
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* @file
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* This is the IPv4 address tools implementation.
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*
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_IPV4
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
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const ip_addr_t ip_addr_any = IPADDR4_INIT(IPADDR_ANY);
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const ip_addr_t ip_addr_broadcast = IPADDR4_INIT(IPADDR_BROADCAST);
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/**
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* Determine if an address is a broadcast address on a network interface
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*
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* @param addr address to be checked
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* @param netif the network interface against which the address is checked
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* @return returns non-zero if the address is a broadcast address
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*/
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u8_t
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ip4_addr_isbroadcast_u32(u32_t addr, const struct netif *netif)
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{
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ip4_addr_t ipaddr;
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ip4_addr_set_u32(&ipaddr, addr);
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/* all ones (broadcast) or all zeroes (old skool broadcast) */
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if ((~addr == IPADDR_ANY) ||
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(addr == IPADDR_ANY)) {
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return 1;
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/* no broadcast support on this network interface? */
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} else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
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/* the given address cannot be a broadcast address
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* nor can we check against any broadcast addresses */
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return 0;
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/* address matches network interface address exactly? => no broadcast */
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} else if (addr == ip4_addr_get_u32(netif_ip4_addr(netif))) {
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return 0;
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/* on the same (sub) network... */
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} else if (ip4_addr_netcmp(&ipaddr, netif_ip4_addr(netif), netif_ip4_netmask(netif))
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/* ...and host identifier bits are all ones? =>... */
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&& ((addr & ~ip4_addr_get_u32(netif_ip4_netmask(netif))) ==
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(IPADDR_BROADCAST & ~ip4_addr_get_u32(netif_ip4_netmask(netif))))) {
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/* => network broadcast address */
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return 1;
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} else {
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return 0;
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}
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}
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/** Checks if a netmask is valid (starting with ones, then only zeros)
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*
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* @param netmask the IPv4 netmask to check (in network byte order!)
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* @return 1 if the netmask is valid, 0 if it is not
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*/
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u8_t
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ip4_addr_netmask_valid(u32_t netmask)
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{
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u32_t mask;
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u32_t nm_hostorder = lwip_htonl(netmask);
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/* first, check for the first zero */
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for (mask = 1UL << 31 ; mask != 0; mask >>= 1) {
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if ((nm_hostorder & mask) == 0) {
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break;
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}
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}
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/* then check that there is no one */
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for (; mask != 0; mask >>= 1) {
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if ((nm_hostorder & mask) != 0) {
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/* there is a one after the first zero -> invalid */
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return 0;
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}
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}
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/* no one after the first zero -> valid */
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return 1;
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}
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/* Here for now until needed in other places in lwIP */
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#ifndef isprint
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#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
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#define isprint(c) in_range(c, 0x20, 0x7f)
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#define isdigit(c) in_range(c, '0', '9')
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#define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
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#define islower(c) in_range(c, 'a', 'z')
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#define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
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#endif
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/**
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* Ascii internet address interpretation routine.
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* The value returned is in network order.
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*
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* @param cp IP address in ascii representation (e.g. "127.0.0.1")
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* @return ip address in network order
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*/
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u32_t
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ipaddr_addr(const char *cp)
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{
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ip4_addr_t val;
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if (ip4addr_aton(cp, &val)) {
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return ip4_addr_get_u32(&val);
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}
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return (IPADDR_NONE);
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}
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/**
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* Check whether "cp" is a valid ascii representation
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* of an Internet address and convert to a binary address.
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* Returns 1 if the address is valid, 0 if not.
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* This replaces inet_addr, the return value from which
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* cannot distinguish between failure and a local broadcast address.
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*
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* @param cp IP address in ascii representation (e.g. "127.0.0.1")
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* @param addr pointer to which to save the ip address in network order
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* @return 1 if cp could be converted to addr, 0 on failure
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*/
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int
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ip4addr_aton(const char *cp, ip4_addr_t *addr)
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{
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u32_t val;
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u8_t base;
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char c;
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u32_t parts[4];
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u32_t *pp = parts;
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#if ESP_LWIP
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//#if 0
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char ch;
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unsigned long cutoff;
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int cutlim;
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#endif
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c = *cp;
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for (;;) {
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/*
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* Collect number up to ``.''.
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* Values are specified as for C:
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* 0x=hex, 0=octal, 1-9=decimal.
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*/
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if (!isdigit(c)) {
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return 0;
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}
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val = 0;
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base = 10;
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if (c == '0') {
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c = *++cp;
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if (c == 'x' || c == 'X') {
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base = 16;
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c = *++cp;
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} else {
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base = 8;
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}
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}
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#if ESP_IP4_ATON
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cutoff =(unsigned long)0xffffffff / (unsigned long)base;
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cutlim =(unsigned long)0xffffffff % (unsigned long)base;
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for (;;) {
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if (isdigit(c)) {
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ch = (int)(c - '0');
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if (val > cutoff || (val == cutoff && ch > cutlim))
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return (0);
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val = (val * base) + (int)(c - '0');
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c = *++cp;
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} else if (base == 16 && isxdigit(c)) {
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ch = (int)(c + 10 - (islower(c) ? 'a' : 'A'));
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if (val > cutoff || (val == cutoff && ch > cutlim))
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return (0);
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val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
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c = *++cp;
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} else
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break;
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}
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#else
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for (;;) {
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if (isdigit(c)) {
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val = (val * base) + (int)(c - '0');
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c = *++cp;
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} else if (base == 16 && isxdigit(c)) {
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val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
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c = *++cp;
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} else {
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break;
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}
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}
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#endif
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if (c == '.') {
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/*
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* Internet format:
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* a.b.c.d
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* a.b.c (with c treated as 16 bits)
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* a.b (with b treated as 24 bits)
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*/
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if (pp >= parts + 3) {
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return 0;
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}
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*pp++ = val;
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c = *++cp;
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} else {
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break;
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}
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}
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/*
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* Check for trailing characters.
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*/
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if (c != '\0' && !isspace(c)) {
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return 0;
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}
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/*
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* Concoct the address according to
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* the number of parts specified.
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*/
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switch (pp - parts + 1) {
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case 0:
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return 0; /* initial nondigit */
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case 1: /* a -- 32 bits */
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break;
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case 2: /* a.b -- 8.24 bits */
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if (val > 0xffffffUL) {
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return 0;
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}
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if (parts[0] > 0xff) {
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return 0;
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}
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val |= parts[0] << 24;
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break;
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case 3: /* a.b.c -- 8.8.16 bits */
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if (val > 0xffff) {
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return 0;
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}
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if ((parts[0] > 0xff) || (parts[1] > 0xff)) {
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return 0;
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}
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val |= (parts[0] << 24) | (parts[1] << 16);
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break;
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case 4: /* a.b.c.d -- 8.8.8.8 bits */
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if (val > 0xff) {
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return 0;
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}
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if ((parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff)) {
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return 0;
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}
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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break;
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default:
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LWIP_ASSERT("unhandled", 0);
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break;
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}
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if (addr) {
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ip4_addr_set_u32(addr, htonl(val));
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}
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return 1;
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}
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/**
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* Convert numeric IP address into decimal dotted ASCII representation.
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* returns ptr to static buffer; not reentrant!
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*
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* @param addr ip address in network order to convert
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* @return pointer to a global static (!) buffer that holds the ASCII
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* representation of addr
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*/
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char*
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ip4addr_ntoa(const ip4_addr_t *addr)
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{
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static char str[IP4ADDR_STRLEN_MAX];
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return ip4addr_ntoa_r(addr, str, IP4ADDR_STRLEN_MAX);
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}
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/**
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* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
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*
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* @param addr ip address in network order to convert
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* @param buf target buffer where the string is stored
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* @param buflen length of buf
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* @return either pointer to buf which now holds the ASCII
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* representation of addr or NULL if buf was too small
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*/
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char*
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ip4addr_ntoa_r(const ip4_addr_t *addr, char *buf, int buflen)
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{
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u32_t s_addr;
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char inv[3];
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char *rp;
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u8_t *ap;
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u8_t rem;
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u8_t n;
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u8_t i;
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int len = 0;
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s_addr = ip4_addr_get_u32(addr);
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rp = buf;
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ap = (u8_t *)&s_addr;
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for (n = 0; n < 4; n++) {
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i = 0;
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do {
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rem = *ap % (u8_t)10;
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*ap /= (u8_t)10;
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inv[i++] = '0' + rem;
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} while (*ap);
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while (i--) {
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if (len++ >= buflen) {
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return NULL;
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}
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*rp++ = inv[i];
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}
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if (len++ >= buflen) {
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return NULL;
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}
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*rp++ = '.';
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ap++;
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}
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*--rp = 0;
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return buf;
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}
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#endif /* LWIP_IPV4 */
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