ipaddr.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2011-2012, 2014-2016 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <mailutils/sockaddr.h>
#include <mailutils/cctype.h>
int
mu_str_is_ipv4 (const char *addr)
{
int dot_count = 0;
int digit_count = 0;
for (; *addr; addr++)
{
if (!mu_isascii (*addr))
return 0;
if (*addr == '.')
{
if (++dot_count > 3)
break;
digit_count = 0;
}
else if (!(mu_isdigit (*addr) && ++digit_count <= 3))
return 0;
}
return (dot_count == 3);
}
int
mu_str_is_ipv6 (const char *addr)
{
int col_count = 0; /* Number of colons */
int dcol = 0; /* Did we encounter a double-colon? */
int dig_count = 0; /* Number of digits in the last group */
for (; *addr; addr++)
{
if (!mu_isascii (*addr))
return 0;
else if (mu_isxdigit (*addr))
{
if (++dig_count > 4)
return 0;
}
else if (*addr == ':')
{
if (col_count && dig_count == 0 && ++dcol > 1)
return 0;
if (++col_count > 7)
return 0;
dig_count = 0;
}
else
return 0;
}
return (col_count == 7 || dcol);
}
int
mu_str_is_ipaddr (const char *addr)
{
if (strchr (addr, '.'))
return mu_str_is_ipv4(addr);
else if (strchr (addr, ':'))
return mu_str_is_ipv6(addr);
return 0;
}