fromstr.c
3.03 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2011 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 <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <mailutils/cidr.h>
#include <mailutils/errno.h>
#include <mailutils/sockaddr.h>
static void
masklen_to_netmask (unsigned char *buf, size_t len, size_t masklen)
{
int i, cnt;
cnt = masklen / 8;
for (i = 0; i < cnt; i++)
buf[i] = 0xff;
if (i == MU_INADDR_BYTES)
return;
cnt = 8 - masklen % 8;
buf[i++] = (0xff >> cnt) << cnt;
for (; i < MU_INADDR_BYTES; i++)
buf[i] = 0;
}
int
mu_cidr_from_string (struct mu_cidr *pcidr, const char *str)
{
int rc;
char ipbuf[41];
struct mu_cidr cidr;
char *p;
size_t len;
union
{
struct in_addr in;
#ifdef MAILUTILS_IPV6
struct in6_addr in6;
#endif
} inaddr;
p = strchr (str, '/');
if (p)
len = p - str;
else
len = strlen (str);
if (len > sizeof (ipbuf))
return MU_ERR_BUFSPACE;
memcpy (ipbuf, str, len);
ipbuf[len] = 0;
if (mu_str_is_ipv4 (ipbuf))
cidr.family = AF_INET;
#ifdef MAILUTILS_IPV6
else if (mu_str_is_ipv6 (ipbuf))
cidr.family = AF_INET6;
#endif
else
return MU_ERR_FAMILY;
rc = inet_pton (cidr.family, ipbuf, &inaddr);
if (rc == -1)
return MU_ERR_FAMILY;
else if (rc == 0)
return MU_ERR_NONAME;
else if (rc != 1)
return MU_ERR_FAILURE;
cidr.len = _mu_inaddr_to_bytes (cidr.family, &inaddr, cidr.address);
if (cidr.len == 0)
return MU_ERR_FAMILY;
if (p)
{
char *end;
unsigned long masklen;
p++;
masklen = strtoul (p, &end, 10);
if (*end == 0)
masklen_to_netmask (cidr.netmask, cidr.len, masklen);
else if ((cidr.family == AF_INET && mu_str_is_ipv4 (p))
#ifdef MAILUTILS_IPV6
|| (cidr.family == AF_INET6 && mu_str_is_ipv6 (ipbuf))
#endif
)
{
rc = inet_pton (cidr.family, p, &inaddr);
if (rc == -1)
return MU_ERR_FAMILY;
else if (rc == 0)
return MU_ERR_NONAME;
else if (rc != 1)
return MU_ERR_FAILURE;
_mu_inaddr_to_bytes (cidr.family, &inaddr, cidr.netmask);
}
else
return MU_ERR_FAMILY;
}
else
masklen_to_netmask (cidr.netmask, cidr.len, cidr.len * 8);
memcpy (pcidr, &cidr, sizeof (*pcidr));
return 0;
}