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/*
* Part of Very Secure FTPd
* Licence: GPL v2
* Author: Chris Evans
* ipaddrparse.c
*
* A routine to parse ip addresses. I'm paranoid and don't want to use
* inet_pton.
*/
#include "ipaddrparse.h"
#include "sysutil.h"
#include "str.h"
static int ipv6_parse_main(struct mystr* p_out_str,
const struct mystr* p_in_str);
static int ipv6_parse_hex(struct mystr* p_out_str,
const struct mystr* p_in_str);
static int ipv4_parse_dotquad(struct mystr* p_out_str,
const struct mystr* p_in_str);
const unsigned char*
vsf_sysutil_parse_ipv6(const struct mystr* p_str)
{
static struct mystr s_ret;
static struct mystr s_rhs_ret;
static struct mystr s_lhs_str;
static struct mystr s_rhs_str;
unsigned int lhs_len;
unsigned int rhs_len;
str_empty(&s_ret);
str_empty(&s_rhs_ret);
str_copy(&s_lhs_str, p_str);
str_split_text(&s_lhs_str, &s_rhs_str, "::");
if (!ipv6_parse_main(&s_ret, &s_lhs_str))
{
return 0;
}
if (!ipv6_parse_main(&s_rhs_ret, &s_rhs_str))
{
return 0;
}
lhs_len = str_getlen(&s_ret);
rhs_len = str_getlen(&s_rhs_ret);
if (lhs_len + rhs_len > 16)
{
return 0;
}
if (rhs_len > 0)
{
unsigned int add_nulls = 16 - (lhs_len + rhs_len);
while (add_nulls--)
{
str_append_char(&s_ret, '\0');
}
str_append_str(&s_ret, &s_rhs_ret);
}
return (const unsigned char*) str_getbuf(&s_ret);
}
const unsigned char*
vsf_sysutil_parse_ipv4(const struct mystr* p_str)
{
static unsigned char items[4];
return vsf_sysutil_parse_uchar_string_sep(p_str, '.', items, sizeof(items));
}
const unsigned char*
vsf_sysutil_parse_uchar_string_sep(
const struct mystr* p_str, char sep, unsigned char* p_items,
unsigned int items)
{
static struct mystr s_tmp_str;
unsigned int i;
str_copy(&s_tmp_str, p_str);
for (i=0; i<items; i++)
{
static struct mystr s_rhs_sep_str;
int this_number;
/* This puts a single separator delimited field in tmp_str */
str_split_char(&s_tmp_str, &s_rhs_sep_str, sep);
/* Sanity - check for too many or two few dots! */
if ( (i < (items-1) && str_isempty(&s_rhs_sep_str)) ||
(i == (items-1) && !str_isempty(&s_rhs_sep_str)))
{
return 0;
}
this_number = str_atoi(&s_tmp_str);
if (this_number < 0 || this_number > 255)
{
return 0;
}
/* If this truncates from int to uchar, we don't care */
p_items[i] = (unsigned char) this_number;
/* The right hand side of the comma now becomes the new string to
* breakdown
*/
str_copy(&s_tmp_str, &s_rhs_sep_str);
}
return p_items;
}
static int
ipv6_parse_main(struct mystr* p_out_str, const struct mystr* p_in_str)
{
static struct mystr s_lhs_str;
static struct mystr s_rhs_str;
struct str_locate_result loc_ret;
str_copy(&s_lhs_str, p_in_str);
while (!str_isempty(&s_lhs_str))
{
str_split_char(&s_lhs_str, &s_rhs_str, ':');
if (str_isempty(&s_lhs_str))
{
return 0;
}
loc_ret = str_locate_char(&s_lhs_str, '.');
if (loc_ret.found)
{
if (!ipv4_parse_dotquad(p_out_str, &s_lhs_str))
{
return 0;
}
}
else if (!ipv6_parse_hex(p_out_str, &s_lhs_str))
{
return 0;
}
str_copy(&s_lhs_str, &s_rhs_str);
}
return 1;
}
static int
ipv6_parse_hex(struct mystr* p_out_str, const struct mystr* p_in_str)
{
unsigned int len = str_getlen(p_in_str);
unsigned int i;
unsigned int val = 0;
for (i=0; i<len; ++i)
{
int ch = vsf_sysutil_toupper(str_get_char_at(p_in_str, i));
if (ch >= '0' && ch <= '9')
{
ch -= '0';
}
else if (ch >= 'A' && ch <= 'F')
{
ch -= 'A';
ch += 10;
}
else
{
return 0;
}
val <<= 4;
val |= ch;
if (val > 0xFFFF)
{
return 0;
}
}
str_append_char(p_out_str, (val >> 8));
str_append_char(p_out_str, (val & 0xFF));
return 1;
}
static int
ipv4_parse_dotquad(struct mystr* p_out_str, const struct mystr* p_in_str)
{
unsigned int len = str_getlen(p_in_str);
unsigned int i;
unsigned int val = 0;
unsigned int final_val = 0;
int seen_char = 0;
int dots = 0;
for (i=0; i<len; ++i)
{
int ch = str_get_char_at(p_in_str, i);
if (ch == '.')
{
if (!seen_char || dots == 3)
{
return 0;
}
seen_char = 0;
dots++;
final_val <<= 8;
final_val |= val;
val = 0;
}
else if (ch >= '0' && ch <= '9')
{
ch -= '0';
val *= 10;
val += ch;
if (val > 255)
{
return 0;
}
seen_char = 1;
}
else
{
return 0;
}
}
if (dots != 3 || !seen_char)
{
return 0;
}
final_val <<= 8;
final_val |= val;
str_append_char(p_out_str, (final_val >> 24));
str_append_char(p_out_str, ((final_val >> 16) & 0xFF));
str_append_char(p_out_str, ((final_val >> 8) & 0xFF));
str_append_char(p_out_str, (final_val & 0xFF));
return 1;
}
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