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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2011-2025 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 <stdlib.h>
#include <mailutils/cidr.h>
#include <mailutils/errno.h>
static int
to_xdig (unsigned char b)
{
if (b >= 0xa)
return 'A' + b - 0xa;
else
return '0' + b;
}
static size_t
format_ipv6_bytes (const unsigned char *bytes, int len,
char *buf, size_t size, int simplify)
{
size_t total = 0;
int i;
int run_count = 0;
char *p;
for (i = 0; i < len; i += 2)
{
if (bytes[0] == 0 && bytes[1] == 0)
{
if (simplify)
run_count++;
else
{
if (i && total++ < size)
*buf++ = ':';
if (total++ < size)
*buf++ = '0';
}
bytes += 2;
}
else
{
if (run_count)
{
if (run_count == 1)
{
if (i && total++ < size)
*buf++ = ':';
if (total++ < size)
*buf++ = '0';
}
else
{
if (total++ < size)
*buf++ = ':';
simplify = 0;
}
run_count = 0;
}
if (i && total++ < size)
*buf++ = ':';
p = buf;
if ((*bytes & 0xf0) && total++ < size)
*buf++ = to_xdig (*bytes >> 4);
if ((buf > p || (*bytes & 0xf)) && total++ < size)
*buf++ = to_xdig (*bytes & 0xf);
bytes++;
if ((buf > p || (*bytes & 0xf0)) && total++ < size)
*buf++ = to_xdig (*bytes >> 4);
if ((buf > p || (*bytes & 0xf)) && total++ < size)
*buf++ = to_xdig (*bytes & 0xf);
bytes++;
}
}
if (run_count)
{
if (run_count == 1)
{
if (i && total++ < size)
*buf++ = ':';
if (total++ < size)
*buf++ = '0';
}
else
{
if (total++ < size)
*buf++ = ':';
if (total++ < size)
*buf++ = ':';
}
}
return total;
}
static size_t
format_ipv6_bytes_normal (const unsigned char *bytes, int len,
char *buf, size_t size)
{
return format_ipv6_bytes (bytes, len, buf, size, 0);
}
static size_t
format_ipv6_bytes_simplified (const unsigned char *bytes, int len,
char *buf, size_t size)
{
return format_ipv6_bytes (bytes, len, buf, size, 1);
}
static size_t
format_ipv4_bytes (const unsigned char *bytes, int len,
char *buf, size_t size)
{
int i;
size_t total = 0;
for (i = 0; i < len; i++)
{
unsigned char b = *bytes++;
char nbuf[3];
int j;
if (i)
{
if (total++ < size)
*buf++ = '.';
}
j = 0;
do
{
nbuf[j++] = b % 10 + '0';
b /= 10;
}
while (b);
for (; j; j--)
{
if (total++ < size)
*buf++ = nbuf[j - 1];
}
}
return total;
}
int
mu_cidr_to_string (struct mu_cidr *cidr, int flags,
char *buf, size_t size, size_t *pret)
{
size_t (*fmt) (const unsigned char *bytes, int len, char *buf, size_t size);
size_t n, total = 0;
if (size == 0)
return MU_ERR_BUFSPACE;
size--;
switch (cidr->family)
{
case AF_INET:
fmt = format_ipv4_bytes;
break;
#ifdef MAILUTILS_IPV6
case AF_INET6:
fmt = (flags & MU_CIDR_FMT_SIMPLIFY) ?
format_ipv6_bytes_simplified : format_ipv6_bytes_normal;
break;
#endif
default:
return MU_ERR_FAMILY;
}
n = fmt (cidr->address, cidr->len, buf, size);
if (buf)
buf += n;
total += n;
if (!(flags & MU_CIDR_FMT_ADDRONLY))
{
if (total++ < size)
*buf++ = '/';
n = fmt (cidr->netmask, cidr->len, buf, size - total);
if (buf)
buf += n;
total += n;
}
if (buf)
*buf++ = 0;
if (pret)
*pret = total;
return 0;
}
int
mu_cidr_format (struct mu_cidr *cidr, int flags, char **pbuf)
{
char buf[MU_CIDR_MAXBUFSIZE];
int rc = mu_cidr_to_string (cidr, flags, buf, sizeof (buf), NULL);
if (rc)
return rc;
*pbuf = strdup (buf);
if (!*buf)
return ENOMEM;
return 0;
}
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