632 lines
16 KiB
C++
632 lines
16 KiB
C++
/*
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Copyright (c) 2007, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/config.hpp"
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#include <boost/bind.hpp>
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#include <vector>
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#include "libtorrent/enum_net.hpp"
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#include "libtorrent/broadcast_socket.hpp"
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#include <boost/asio/ip/host_name.hpp>
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#if defined TORRENT_BSD
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <sys/sysctl.h>
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#include <boost/scoped_array.hpp>
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#endif
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#if defined TORRENT_WINDOWS
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#include <iphlpapi.h>
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#endif
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#if defined TORRENT_LINUX
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#include <asm/types.h>
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#include <netinet/ether.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <stdio.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#endif
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namespace libtorrent { namespace
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{
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address inaddr_to_address(in_addr const* ina)
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{
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typedef asio::ip::address_v4::bytes_type bytes_t;
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bytes_t b;
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memcpy(&b[0], ina, b.size());
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return address_v4(b);
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}
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address inaddr6_to_address(in6_addr const* ina6)
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{
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typedef asio::ip::address_v6::bytes_type bytes_t;
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bytes_t b;
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memcpy(&b[0], ina6, b.size());
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return address_v6(b);
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}
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address sockaddr_to_address(sockaddr const* sin)
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{
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if (sin->sa_family == AF_INET)
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return inaddr_to_address(&((sockaddr_in const*)sin)->sin_addr);
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else if (sin->sa_family == AF_INET6)
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return inaddr6_to_address(&((sockaddr_in6 const*)sin)->sin6_addr);
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return address();
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}
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#if defined TORRENT_LINUX
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int read_nl_sock(int sock, char *buf, int bufsize, int seq, int pid)
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{
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nlmsghdr* nl_hdr;
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int msg_len = 0;
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do
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{
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int read_len = recv(sock, buf, bufsize - msg_len, 0);
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if (read_len < 0) return -1;
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nl_hdr = (nlmsghdr*)buf;
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if ((NLMSG_OK(nl_hdr, read_len) == 0) || (nl_hdr->nlmsg_type == NLMSG_ERROR))
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return -1;
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if (nl_hdr->nlmsg_type == NLMSG_DONE) break;
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buf += read_len;
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msg_len += read_len;
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if ((nl_hdr->nlmsg_flags & NLM_F_MULTI) == 0) break;
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} while((nl_hdr->nlmsg_seq != seq) || (nl_hdr->nlmsg_pid != pid));
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return msg_len;
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}
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bool parse_route(nlmsghdr* nl_hdr, ip_route* rt_info)
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{
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rtmsg* rt_msg = (rtmsg*)NLMSG_DATA(nl_hdr);
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if((rt_msg->rtm_family != AF_INET) || (rt_msg->rtm_table != RT_TABLE_MAIN))
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return false;
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int rt_len = RTM_PAYLOAD(nl_hdr);
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for (rtattr* rt_attr = (rtattr*)RTM_RTA(rt_msg);
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RTA_OK(rt_attr,rt_len); rt_attr = RTA_NEXT(rt_attr,rt_len))
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{
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switch(rt_attr->rta_type)
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{
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case RTA_OIF:
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if_indextoname(*(int*)RTA_DATA(rt_attr), rt_info->name);
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break;
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case RTA_GATEWAY:
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rt_info->gateway = address_v4(*(u_int*)RTA_DATA(rt_attr));
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break;
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case RTA_DST:
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rt_info->destination = address_v4(*(u_int*)RTA_DATA(rt_attr));
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break;
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}
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}
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return true;
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}
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#endif
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#if defined TORRENT_BSD
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bool parse_route(rt_msghdr* rtm, ip_route* rt_info)
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{
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sockaddr* rti_info[RTAX_MAX];
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sockaddr* sa = (sockaddr*)(rtm + 1);
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for (int i = 0; i < RTAX_MAX; ++i)
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{
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if ((rtm->rtm_addrs & (1 << i)) == 0)
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{
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rti_info[i] = 0;
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continue;
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}
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rti_info[i] = sa;
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#define ROUNDUP(a) \
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((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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sa = (sockaddr*)((char*)(sa) + ROUNDUP(sa->sa_len));
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#undef ROUNDUP
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}
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sa = rti_info[RTAX_GATEWAY];
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if (sa == 0
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|| rti_info[RTAX_DST] == 0
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|| rti_info[RTAX_NETMASK] == 0
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|| (sa->sa_family != AF_INET && sa->sa_family != AF_INET6))
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return false;
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rt_info->gateway = sockaddr_to_address(rti_info[RTAX_GATEWAY]);
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rt_info->netmask = sockaddr_to_address(rti_info[RTAX_NETMASK]);
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rt_info->destination = sockaddr_to_address(rti_info[RTAX_DST]);
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if_indextoname(rtm->rtm_index, rt_info->name);
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return true;
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}
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#endif
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#ifdef TORRENT_BSD
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bool verify_sockaddr(sockaddr_in* sin)
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{
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return (sin->sin_len == sizeof(sockaddr_in)
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&& sin->sin_family == AF_INET)
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|| (sin->sin_len == sizeof(sockaddr_in6)
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&& sin->sin_family == AF_INET6);
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}
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#endif
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}} // <anonymous>
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namespace libtorrent
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{
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bool in_subnet(address const& addr, ip_interface const& iface)
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{
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if (addr.is_v4() != iface.interface_address.is_v4()) return false;
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// since netmasks seems unreliable for IPv6 interfaces
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// (MacOS X returns AF_INET addresses as bitmasks) assume
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// that any IPv6 address belongs to the subnet of any
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// interface with an IPv6 address
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if (addr.is_v6()) return true;
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return (addr.to_v4().to_ulong() & iface.netmask.to_v4().to_ulong())
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== (iface.interface_address.to_v4().to_ulong() & iface.netmask.to_v4().to_ulong());
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}
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bool in_local_network(io_service& ios, address const& addr, error_code& ec)
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{
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std::vector<ip_interface> const& net = enum_net_interfaces(ios, ec);
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if (ec) return false;
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for (std::vector<ip_interface>::const_iterator i = net.begin()
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, end(net.end()); i != end; ++i)
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{
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if (in_subnet(addr, *i)) return true;
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}
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return false;
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}
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std::vector<ip_interface> enum_net_interfaces(io_service& ios, error_code& ec)
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{
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std::vector<ip_interface> ret;
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// covers linux, MacOS X and BSD distributions
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#if defined TORRENT_LINUX || defined TORRENT_BSD
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int s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0)
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{
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ec = asio::error::fault;
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return ret;
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}
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ifconf ifc;
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char buf[1024];
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ifc.ifc_len = sizeof(buf);
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ifc.ifc_buf = buf;
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if (ioctl(s, SIOCGIFCONF, &ifc) < 0)
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{
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ec = error_code(errno, asio::error::system_category);
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close(s);
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return ret;
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}
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char *ifr = (char*)ifc.ifc_req;
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int remaining = ifc.ifc_len;
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while (remaining)
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{
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ifreq const& item = *reinterpret_cast<ifreq*>(ifr);
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if (item.ifr_addr.sa_family == AF_INET
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|| item.ifr_addr.sa_family == AF_INET6)
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{
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ip_interface iface;
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iface.interface_address = sockaddr_to_address(&item.ifr_addr);
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strcpy(iface.name, item.ifr_name);
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ifreq netmask = item;
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if (ioctl(s, SIOCGIFNETMASK, &netmask) < 0)
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{
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if (iface.interface_address.is_v6())
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{
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// this is expected to fail (at least on MacOS X)
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iface.netmask = address_v6::any();
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}
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else
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{
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ec = error_code(errno, asio::error::system_category);
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close(s);
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return ret;
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}
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}
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else
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{
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iface.netmask = sockaddr_to_address(&netmask.ifr_addr);
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}
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ret.push_back(iface);
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}
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#if defined TORRENT_BSD
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int current_size = item.ifr_addr.sa_len + IFNAMSIZ;
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#elif defined TORRENT_LINUX
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int current_size = sizeof(ifreq);
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#endif
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ifr += current_size;
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remaining -= current_size;
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}
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close(s);
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#elif defined TORRENT_WINDOWS
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SOCKET s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s == SOCKET_ERROR)
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{
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ec = error_code(WSAGetLastError(), asio::error::system_category);
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return ret;
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}
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INTERFACE_INFO buffer[30];
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DWORD size;
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if (WSAIoctl(s, SIO_GET_INTERFACE_LIST, 0, 0, buffer,
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sizeof(buffer), &size, 0, 0) != 0)
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{
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ec = error_code(WSAGetLastError(), asio::error::system_category);
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closesocket(s);
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return ret;
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}
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closesocket(s);
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int n = size / sizeof(INTERFACE_INFO);
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ip_interface iface;
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for (int i = 0; i < n; ++i)
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{
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iface.interface_address = sockaddr_to_address(&buffer[i].iiAddress.Address);
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iface.netmask = sockaddr_to_address(&buffer[i].iiNetmask.Address);
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iface.name[0] = 0;
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if (iface.interface_address == address_v4::any()) continue;
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ret.push_back(iface);
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}
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#else
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#warning THIS OS IS NOT RECOGNIZED, enum_net_interfaces WILL PROBABLY NOT WORK
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// make a best guess of the interface we're using and its IP
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udp::resolver r(ios);
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udp::resolver::iterator i = r.resolve(udp::resolver::query(asio::ip::host_name(ec), "0"), ec);
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if (ec) return ret;
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ip_interface iface;
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for (;i != udp::resolver_iterator(); ++i)
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{
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iface.interface_address = i->endpoint().address();
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if (iface.interface_address.is_v4())
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iface.netmask = address_v4::netmask(iface.interface_address.to_v4());
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ret.push_back(iface);
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}
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#endif
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return ret;
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}
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address get_default_gateway(io_service& ios, error_code& ec)
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{
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std::vector<ip_route> ret = enum_routes(ios, ec);
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#ifdef TORRENT_WINDOWS
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std::vector<ip_route>::iterator i = std::find_if(ret.begin(), ret.end()
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, boost::bind(&is_loopback, boost::bind(&ip_route::destination, _1)));
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#else
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std::vector<ip_route>::iterator i = std::find_if(ret.begin(), ret.end()
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, boost::bind(&ip_route::destination, _1) == address());
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#endif
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if (i == ret.end()) return address();
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return i->gateway;
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}
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std::vector<ip_route> enum_routes(io_service& ios, error_code& ec)
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{
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std::vector<ip_route> ret;
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#if defined TORRENT_BSD
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/*
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struct rt_msg
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{
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rt_msghdr m_rtm;
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char buf[512];
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};
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rt_msg m;
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int len = sizeof(rt_msg);
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bzero(&m, len);
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m.m_rtm.rtm_type = RTM_GET;
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m.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
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m.m_rtm.rtm_version = RTM_VERSION;
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m.m_rtm.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
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m.m_rtm.rtm_seq = 0;
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m.m_rtm.rtm_msglen = len;
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int s = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
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if (s == -1)
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{
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ec = error_code(errno, asio::error::system_category);
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return std::vector<ip_route>();
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}
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int n = write(s, &m, len);
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if (n == -1)
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{
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ec = error_code(errno, asio::error::system_category);
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close(s);
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return std::vector<ip_route>();
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}
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else if (n != len)
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{
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ec = asio::error::operation_not_supported;
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close(s);
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return std::vector<ip_route>();
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}
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bzero(&m, len);
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n = read(s, &m, len);
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if (n == -1)
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{
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ec = error_code(errno, asio::error::system_category);
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close(s);
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return std::vector<ip_route>();
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}
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for (rt_msghdr* ptr = &m.m_rtm; (char*)ptr < ((char*)&m.m_rtm) + n; ptr = (rt_msghdr*)(((char*)ptr) + ptr->rtm_msglen))
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{
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std::cout << " rtm_msglen: " << ptr->rtm_msglen << std::endl;
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std::cout << " rtm_type: " << ptr->rtm_type << std::endl;
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if (ptr->rtm_errno)
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{
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ec = error_code(ptr->rtm_errno, asio::error::system_category);
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return std::vector<ip_route>();
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}
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if (m.m_rtm.rtm_flags & RTF_UP == 0
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|| m.m_rtm.rtm_flags & RTF_GATEWAY == 0)
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{
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ec = asio::error::operation_not_supported;
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return address_v4::any();
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}
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if (ptr->rtm_addrs & RTA_DST == 0
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|| ptr->rtm_addrs & RTA_GATEWAY == 0
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|| ptr->rtm_addrs & RTA_NETMASK == 0)
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{
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ec = asio::error::operation_not_supported;
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return std::vector<ip_route>();
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}
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if (ptr->rtm_msglen > len - ((char*)ptr - ((char*)&m.m_rtm)))
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{
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ec = asio::error::operation_not_supported;
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return std::vector<ip_route>();
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}
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int min_len = sizeof(rt_msghdr) + 2 * sizeof(sockaddr_in);
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if (m.m_rtm.rtm_msglen < min_len)
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{
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ec = asio::error::operation_not_supported;
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return std::vector<ip_route>();
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}
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ip_route r;
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// destination
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char* p = m.buf;
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sockaddr_in* sin = (sockaddr_in*)p;
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r.destination = sockaddr_to_address((sockaddr*)p);
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// gateway
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p += sin->sin_len;
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sin = (sockaddr_in*)p;
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r.gateway = sockaddr_to_address((sockaddr*)p);
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// netmask
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p += sin->sin_len;
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sin = (sockaddr_in*)p;
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r.netmask = sockaddr_to_address((sockaddr*)p);
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ret.push_back(r);
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}
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close(s);
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*/
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int mib[6] = { CTL_NET, PF_ROUTE, 0, AF_UNSPEC, NET_RT_DUMP, 0};
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size_t needed = 0;
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if (sysctl(mib, 6, 0, &needed, 0, 0) < 0)
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{
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ec = error_code(errno, asio::error::system_category);
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return std::vector<ip_route>();
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}
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if (needed <= 0)
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{
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return std::vector<ip_route>();
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}
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boost::scoped_array<char> buf(new (std::nothrow) char[needed]);
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if (buf.get() == 0)
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{
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ec = asio::error::no_memory;
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return std::vector<ip_route>();
|
|
}
|
|
|
|
if (sysctl(mib, 6, buf.get(), &needed, 0, 0) < 0)
|
|
{
|
|
ec = error_code(errno, asio::error::system_category);
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
char* end = buf.get() + needed;
|
|
|
|
rt_msghdr* rtm;
|
|
for (char* next = buf.get(); next < end; next += rtm->rtm_msglen)
|
|
{
|
|
rtm = (rt_msghdr*)next;
|
|
if (rtm->rtm_version != RTM_VERSION)
|
|
continue;
|
|
|
|
ip_route r;
|
|
if (parse_route(rtm, &r)) ret.push_back(r);
|
|
}
|
|
|
|
#elif defined TORRENT_WINDOWS
|
|
|
|
// Load Iphlpapi library
|
|
HMODULE iphlp = LoadLibraryA("Iphlpapi.dll");
|
|
if (!iphlp)
|
|
{
|
|
ec = asio::error::operation_not_supported;
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
// Get GetAdaptersInfo() pointer
|
|
typedef DWORD (WINAPI *GetAdaptersInfo_t)(PIP_ADAPTER_INFO, PULONG);
|
|
GetAdaptersInfo_t GetAdaptersInfo = (GetAdaptersInfo_t)GetProcAddress(iphlp, "GetAdaptersInfo");
|
|
if (!GetAdaptersInfo)
|
|
{
|
|
FreeLibrary(iphlp);
|
|
ec = asio::error::operation_not_supported;
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
PIP_ADAPTER_INFO adapter_info = 0;
|
|
ULONG out_buf_size = 0;
|
|
if (GetAdaptersInfo(adapter_info, &out_buf_size) != ERROR_BUFFER_OVERFLOW)
|
|
{
|
|
FreeLibrary(iphlp);
|
|
ec = asio::error::operation_not_supported;
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
adapter_info = (IP_ADAPTER_INFO*)malloc(out_buf_size);
|
|
if (!adapter_info)
|
|
{
|
|
FreeLibrary(iphlp);
|
|
ec = asio::error::no_memory;
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
if (GetAdaptersInfo(adapter_info, &out_buf_size) == NO_ERROR)
|
|
{
|
|
for (PIP_ADAPTER_INFO adapter = adapter_info;
|
|
adapter != 0; adapter = adapter->Next)
|
|
{
|
|
|
|
ip_route r;
|
|
r.destination = address::from_string(adapter->IpAddressList.IpAddress.String, ec);
|
|
r.gateway = address::from_string(adapter->GatewayList.IpAddress.String, ec);
|
|
r.netmask = address::from_string(adapter->IpAddressList.IpMask.String, ec);
|
|
strncpy(r.name, adapter->AdapterName, sizeof(r.name));
|
|
|
|
if (ec)
|
|
{
|
|
ec = error_code();
|
|
continue;
|
|
}
|
|
ret.push_back(r);
|
|
}
|
|
}
|
|
|
|
// Free memory
|
|
free(adapter_info);
|
|
FreeLibrary(iphlp);
|
|
|
|
#elif defined TORRENT_LINUX
|
|
|
|
enum { BUFSIZE = 8192 };
|
|
|
|
int sock = socket(PF_ROUTE, SOCK_DGRAM, NETLINK_ROUTE);
|
|
if (sock < 0)
|
|
{
|
|
ec = error_code(errno, asio::error::system_category);
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
int seq = 0;
|
|
|
|
char msg[BUFSIZE];
|
|
memset(msg, 0, BUFSIZE);
|
|
nlmsghdr* nl_msg = (nlmsghdr*)msg;
|
|
|
|
nl_msg->nlmsg_len = NLMSG_LENGTH(sizeof(rtmsg));
|
|
nl_msg->nlmsg_type = RTM_GETROUTE;
|
|
nl_msg->nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
|
|
nl_msg->nlmsg_seq = seq++;
|
|
nl_msg->nlmsg_pid = getpid();
|
|
|
|
if (send(sock, nl_msg, nl_msg->nlmsg_len, 0) < 0)
|
|
{
|
|
ec = error_code(errno, asio::error::system_category);
|
|
close(sock);
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
int len = read_nl_sock(sock, msg, BUFSIZE, seq, getpid());
|
|
if (len < 0)
|
|
{
|
|
ec = error_code(errno, asio::error::system_category);
|
|
close(sock);
|
|
return std::vector<ip_route>();
|
|
}
|
|
|
|
for (; NLMSG_OK(nl_msg, len); nl_msg = NLMSG_NEXT(nl_msg, len))
|
|
{
|
|
ip_route r;
|
|
if (parse_route(nl_msg, &r)) ret.push_back(r);
|
|
}
|
|
close(sock);
|
|
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
}
|
|
|
|
|