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/*******************************************************************************
* libproxy - A library for proxy configuration
* Copyright (C) 2006 Nathaniel McCallum <nathaniel@natemccallum.com>
*
* 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 2.1 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
******************************************************************************/
#include <cstdio>
#include <cstring>
#include "../extension_ignore.hpp"
using namespace libproxy;
static inline bool
sockaddr_equals(const struct sockaddr *ip_a, const struct sockaddr *ip_b, const struct sockaddr *nm)
{
if (!ip_a || !ip_b) return false;
if (ip_a->sa_family != ip_b->sa_family) return false;
if (nm && ip_a->sa_family != nm->sa_family) return false;
/* Setup the arrays */
uint8_t bytes = 0, *a_data = NULL, *b_data = NULL, *nm_data = NULL;
if (ip_a->sa_family == AF_INET)
{
bytes = 32 / 8;
a_data = (uint8_t *) &((struct sockaddr_in *) ip_a)->sin_addr;
b_data = (uint8_t *) &((struct sockaddr_in *) ip_b)->sin_addr;
nm_data = nm ? (uint8_t *) &((struct sockaddr_in *) nm)->sin_addr : NULL;
}
else if (ip_a->sa_family == AF_INET6)
{
bytes = 128 / 8;
a_data = (uint8_t *) &((struct sockaddr_in6 *) ip_a)->sin6_addr;
b_data = (uint8_t *) &((struct sockaddr_in6 *) ip_b)->sin6_addr;
nm_data = nm ? (uint8_t *) &((struct sockaddr_in6 *) nm)->sin6_addr : NULL;
}
else
return false;
for (int i=0 ; i < bytes ; i++)
{
if (nm && (a_data[i] & nm_data[i]) != (b_data[i] & nm_data[i]))
return false;
else if (!nm && (a_data[i] != b_data[i]))
return false;
}
return true;
}
static inline sockaddr *
sockaddr_from_string(string ip)
{
struct sockaddr *result = NULL;
/* Try to parse */
struct addrinfo *info = NULL;
struct addrinfo flags;
flags.ai_family = AF_UNSPEC;
flags.ai_socktype = 0;
flags.ai_protocol = 0;
flags.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(ip.c_str(), NULL, &flags, &info) != 0 || !info) return result;
/* Copy the results into our buffer */
result = (sockaddr *) new char[info->ai_addrlen];
if (!result) {
freeaddrinfo(info);
return result;
}
memcpy(result, info->ai_addr, info->ai_addrlen);
freeaddrinfo(info);
return result;
}
static inline sockaddr *
sockaddr_from_cidr(sa_family_t af, uint8_t cidr)
{
/* IPv4 */
if (af == AF_INET)
{
sockaddr_in *mask = (sockaddr_in*) new char[sizeof(sockaddr_in)];
mask->sin_family = af;
mask->sin_addr.s_addr = htonl(~0 << (32 - (cidr > 32 ? 32 : cidr)));
return (struct sockaddr *) mask;
}
/* IPv6 */
else if (af == AF_INET6)
{
sockaddr_in6 *mask = (sockaddr_in6*) new char[sizeof(sockaddr_in6)];
mask->sin6_family = af;
for (uint8_t i=0 ; i < sizeof(mask->sin6_addr) ; i++)
mask->sin6_addr.s6_addr[i] = ~0 << (8 - (8*i > cidr ? 0 : cidr-8*i < 8 ? cidr-8*i : 8) );
return (sockaddr *) mask;
}
return NULL;
}
class ip_ignore_extension : public ignore_extension {
public:
virtual bool ignore(url& url, const string &ignore) {
bool result = false;
uint16_t port = 0;
const struct sockaddr *dst_ip = url.get_ips(false) ? url.get_ips(false)[0] : NULL;
struct sockaddr *ign_ip = NULL, *net_ip = NULL;
/*
* IPv4
* IPv6
*/
if ((ign_ip = sockaddr_from_string(ignore)))
goto out;
/*
* IPv4/CIDR
* IPv4/IPv4
* IPv6/CIDR
* IPv6/IPv6
*/
if (ignore.find('/') != string::npos)
{
ign_ip = sockaddr_from_string(ignore.substr(0, ignore.find('/')));
uint32_t cidr = 0;
string mask = ignore.substr(ignore.find('/') + 1);
if (mask.find('.') != string::npos)
{
/* A dotted netmask was used */
net_ip = sockaddr_from_string(mask);
}
else
{
/* If CIDR notation was used, get the netmask */
if (sscanf(mask.c_str(), "%d", &cidr) == 1)
net_ip = sockaddr_from_cidr(ign_ip->sa_family, cidr);
}
if (ign_ip && net_ip && ign_ip->sa_family == net_ip->sa_family)
goto out;
delete[] ign_ip;
delete[] net_ip;
ign_ip = NULL;
net_ip = NULL;
}
/*
* IPv4:port
* [IPv6]:port
*/
if (ignore.rfind(':') != string::npos && sscanf(ignore.substr(ignore.rfind(':')).c_str(), ":%hu", &port) == 1 && port > 0)
{
ign_ip = sockaddr_from_string(ignore.substr(ignore.rfind(':')).c_str());
/* Make sure this really is just a port and not just an IPv6 address */
if (ign_ip && (ign_ip->sa_family != AF_INET6 || ignore[0] == '['))
goto out;
delete[] ign_ip;
ign_ip = NULL;
port = 0;
}
out:
result = sockaddr_equals(dst_ip, ign_ip, net_ip);
delete[] ign_ip;
delete[] net_ip;
return port != 0 ? (port == url.get_port() && result) : result;
}
};
MM_MODULE_INIT_EZ(ip_ignore_extension, true, NULL, NULL);
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