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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-05-18 ChenYong First version
*/
#include <sal_ipaddr.h>
#include <rtthread.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
/**
* 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 representation (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 sal_ip4addr_aton(const char *cp, ip4_addr_t *addr)
{
u32_t val;
u8_t base;
char 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) + (u32_t) (c - '0');
c = *++cp;
}
else if (base == 16 && isxdigit(c))
{
val = (val << 4) | (u32_t) (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' && !isspace(c))
{
return 0;
}
/*
* Concoct the address according to
* the number of parts specified.
*/
switch (pp - parts + 1)
{
case 0:
return 0; /* initial nondigit */
case 1: /* a -- 32 bits */
break;
case 2: /* a.b -- 8.24 bits */
if (val > 0xffffffUL)
{
return 0;
}
if (parts[0] > 0xff)
{
return 0;
}
val |= parts[0] << 24;
break;
case 3: /* a.b.c -- 8.8.16 bits */
if (val > 0xffff)
{
return 0;
}
if ((parts[0] > 0xff) || (parts[1] > 0xff))
{
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;
}
if ((parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
{
return 0;
}
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
break;
default:
RT_ASSERT(0);
break;
}
if (addr)
{
ip4_addr_set_u32(addr, htonl(val));
}
return 1;
}
/**
* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
*
* @param addr ip address in network order to convert
* @param buf target buffer where the string is stored
* @param buflen length of buf
* @return either pointer to buf which now holds the ASCII
* representation of addr or NULL if buf was too small
*/
char *sal_ip4addr_ntoa_r(const ip4_addr_t *addr, char *buf, int buflen)
{
u32_t s_addr;
char inv[3];
char *rp;
u8_t *ap;
u8_t rem;
u8_t n;
u8_t i;
int len = 0;
s_addr = ip4_addr_get_u32(addr);
rp = buf;
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++] = (char) ('0' + rem);
} while (*ap);
while (i--)
{
if (len++ >= buflen)
{
return NULL;
}
*rp++ = inv[i];
}
if (len++ >= buflen)
{
return NULL;
}
*rp++ = '.';
ap++;
}
*--rp = 0;
return buf;
}
/**
* 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
* representation of addr
*/
char *sal_ip4addr_ntoa(const ip4_addr_t *addr)
{
static char str[IP4ADDR_STRLEN_MAX];
return sal_ip4addr_ntoa_r(addr, str, IP4ADDR_STRLEN_MAX);
}
/**
* Ascii internet address interpretation routine.
* The value returned is in network order.
*
* @param cp IP address in ascii representation (e.g. "127.0.0.1")
* @return ip address in network order
*/
in_addr_t sal_ipaddr_addr(const char *cp)
{
ip4_addr_t val;
if (sal_ip4addr_aton(cp, &val)) {
return ip4_addr_get_u32(&val);
}
return (IPADDR_NONE);
}
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