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premiere-libtorrent/src/enum_net.cpp

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/*
Copyright (c) 2007, Arvid Norberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/config.hpp"
#include <boost/bind.hpp>
#include <vector>
#include <stdlib.h> // for wcstombscstombs
#include "libtorrent/enum_net.hpp"
#include "libtorrent/broadcast_socket.hpp"
#include "libtorrent/error_code.hpp"
#if BOOST_VERSION < 103500
#include <asio/ip/host_name.hpp>
#else
#include <boost/asio/ip/host_name.hpp>
#endif
#if defined TORRENT_BSD || defined TORRENT_SOLARIS
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <net/route.h>
#include <string.h>
#include <boost/scoped_array.hpp>
#endif
#if defined TORRENT_BSD
#include <sys/sysctl.h>
#endif
#if defined TORRENT_WINDOWS || defined TORRENT_MINGW
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <iphlpapi.h>
#endif
#if defined TORRENT_LINUX
#include <asm/types.h>
#include <netinet/ether.h>
#include <netinet/in.h>
#include <net/if.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#endif
namespace libtorrent { namespace
{
address inaddr_to_address(in_addr const* ina, int len = 4)
{
typedef asio::ip::address_v4::bytes_type bytes_t;
bytes_t b;
std::memset(&b[0], 0, b.size());
if (len > 0) std::memcpy(&b[0], ina, (std::min)(len, int(b.size())));
return address_v4(b);
}
#if TORRENT_USE_IPV6
address inaddr6_to_address(in6_addr const* ina6, int len = 16)
{
typedef asio::ip::address_v6::bytes_type bytes_t;
bytes_t b;
std::memset(&b[0], 0, b.size());
if (len > 0) std::memcpy(&b[0], ina6, (std::min)(len, int(b.size())));
return address_v6(b);
}
#endif
int sockaddr_len(sockaddr const* sin)
{
#if defined TORRENT_WINDOWS || TORRENT_MINGW || defined TORRENT_LINUX
return sin->sa_family == AF_INET ? sizeof(sockaddr_in) : sizeof(sockaddr_in6);
#else
return sin->sa_len;
#endif
}
address sockaddr_to_address(sockaddr const* sin, int assume_family = -1)
{
if (sin->sa_family == AF_INET || assume_family == AF_INET)
return inaddr_to_address(&((sockaddr_in const*)sin)->sin_addr
, sockaddr_len(sin) - offsetof(sockaddr, sa_data));
#if TORRENT_USE_IPV6
else if (sin->sa_family == AF_INET6 || assume_family == AF_INET6)
return inaddr6_to_address(&((sockaddr_in6 const*)sin)->sin6_addr
, sockaddr_len(sin) - offsetof(sockaddr, sa_data));
#endif
return address();
}
#if defined TORRENT_LINUX
int read_nl_sock(int sock, char *buf, int bufsize, int seq, int pid)
{
nlmsghdr* nl_hdr;
int msg_len = 0;
do
{
int read_len = recv(sock, buf, bufsize - msg_len, 0);
if (read_len < 0) return -1;
nl_hdr = (nlmsghdr*)buf;
if ((NLMSG_OK(nl_hdr, read_len) == 0) || (nl_hdr->nlmsg_type == NLMSG_ERROR))
return -1;
if (nl_hdr->nlmsg_type == NLMSG_DONE) break;
buf += read_len;
msg_len += read_len;
if ((nl_hdr->nlmsg_flags & NLM_F_MULTI) == 0) break;
} while((nl_hdr->nlmsg_seq != seq) || (nl_hdr->nlmsg_pid != pid));
return msg_len;
}
bool parse_route(int s, nlmsghdr* nl_hdr, ip_route* rt_info)
{
rtmsg* rt_msg = (rtmsg*)NLMSG_DATA(nl_hdr);
if((rt_msg->rtm_family != AF_INET && rt_msg->rtm_family != AF_INET6) || (rt_msg->rtm_table != RT_TABLE_MAIN
&& rt_msg->rtm_table != RT_TABLE_LOCAL))
return false;
int if_index = 0;
int rt_len = RTM_PAYLOAD(nl_hdr);
for (rtattr* rt_attr = (rtattr*)RTM_RTA(rt_msg);
RTA_OK(rt_attr,rt_len); rt_attr = RTA_NEXT(rt_attr,rt_len))
{
switch(rt_attr->rta_type)
{
case RTA_OIF:
if_index = *(int*)RTA_DATA(rt_attr);
break;
case RTA_GATEWAY:
#if TORRENT_USE_IPV6
if (rt_msg->rtm_family == AF_INET6)
{
rt_info->gateway = inaddr6_to_address((in6_addr*)RTA_DATA(rt_attr));
}
else
#endif
{
rt_info->gateway = inaddr_to_address((in_addr*)RTA_DATA(rt_attr));
}
break;
case RTA_DST:
#if TORRENT_USE_IPV6
if (rt_msg->rtm_family == AF_INET6)
{
rt_info->destination = inaddr6_to_address((in6_addr*)RTA_DATA(rt_attr));
}
else
#endif
{
rt_info->destination = inaddr_to_address((in_addr*)RTA_DATA(rt_attr));
}
break;
}
}
if_indextoname(if_index, rt_info->name);
ifreq req;
memset(&req, 0, sizeof(req));
if_indextoname(if_index, req.ifr_name);
ioctl(s, SIOCGIFMTU, &req);
rt_info->mtu = req.ifr_mtu;
// obviously this doesn't work correctly. How do you get the netmask for a route?
// if (ioctl(s, SIOCGIFNETMASK, &req) == 0) {
// rt_info->netmask = sockaddr_to_address(&req.ifr_addr, req.ifr_addr.sa_family);
// }
return true;
}
#endif
#if defined TORRENT_BSD
bool parse_route(int s, rt_msghdr* rtm, ip_route* rt_info)
{
sockaddr* rti_info[RTAX_MAX];
sockaddr* sa = (sockaddr*)(rtm + 1);
for (int i = 0; i < RTAX_MAX; ++i)
{
if ((rtm->rtm_addrs & (1 << i)) == 0)
{
rti_info[i] = 0;
continue;
}
rti_info[i] = sa;
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
sa = (sockaddr*)((char*)(sa) + ROUNDUP(sa->sa_len));
#undef ROUNDUP
}
sa = rti_info[RTAX_GATEWAY];
if (sa == 0
|| rti_info[RTAX_DST] == 0
|| rti_info[RTAX_NETMASK] == 0
|| (sa->sa_family != AF_INET
#if TORRENT_USE_IPV6
&& sa->sa_family != AF_INET6
#endif
))
return false;
rt_info->gateway = sockaddr_to_address(rti_info[RTAX_GATEWAY]);
rt_info->destination = sockaddr_to_address(rti_info[RTAX_DST]);
rt_info->netmask = sockaddr_to_address(rti_info[RTAX_NETMASK]
, rt_info->destination.is_v4() ? AF_INET : AF_INET6);
if_indextoname(rtm->rtm_index, rt_info->name);
ifreq req;
memset(&req, 0, sizeof(req));
if_indextoname(rtm->rtm_index, req.ifr_name);
if (ioctl(s, SIOCGIFMTU, &req) < 0) return false;
rt_info->mtu = req.ifr_mtu;
return true;
}
#endif
#ifdef TORRENT_BSD
bool verify_sockaddr(sockaddr_in* sin)
{
return (sin->sin_len == sizeof(sockaddr_in)
&& sin->sin_family == AF_INET)
#if TORRENT_USE_IPV6
|| (sin->sin_len == sizeof(sockaddr_in6)
&& sin->sin_family == AF_INET6)
#endif
;
}
#endif
}} // <anonymous>
namespace libtorrent
{
// return (a1 & mask) == (a2 & mask)
bool match_addr_mask(address const& a1, address const& a2, address const& mask)
{
// all 3 addresses needs to belong to the same family
if (a1.is_v4() != a2.is_v4()) return false;
if (a1.is_v4() != mask.is_v4()) return false;
#if TORRENT_USE_IPV6
if (a1.is_v6())
{
address_v6::bytes_type b1;
address_v6::bytes_type b2;
address_v6::bytes_type m;
b1 = a1.to_v6().to_bytes();
b2 = a2.to_v6().to_bytes();
m = mask.to_v6().to_bytes();
for (int i = 0; i < b1.size(); ++i)
b1[i] &= m[i];
return memcmp(&b1[0], &b2[0], b1.size());
}
#endif
return (a1.to_v4().to_ulong() & mask.to_v4().to_ulong())
== (a2.to_v4().to_ulong() & mask.to_v4().to_ulong());
}
bool in_local_network(io_service& ios, address const& addr, error_code& ec)
{
std::vector<ip_interface> net = enum_net_interfaces(ios, ec);
if (ec) return false;
for (std::vector<ip_interface>::iterator i = net.begin()
, end(net.end()); i != end; ++i)
{
if (match_addr_mask(addr, i->interface_address, i->netmask)) return true;
}
return false;
}
#if defined TORRENT_WINDOWS || defined TORRENT_MINGW
address build_netmask(int bits, int family)
{
if (family == AF_INET)
{
typedef asio::ip::address_v4::bytes_type bytes_t;
bytes_t b;
std::memset(&b[0], 0xff, b.size());
for (int i = sizeof(bytes_t)/8-1; i > 0; --i)
{
if (bits < 8)
{
b[i] <<= bits;
break;
}
b[i] = 0;
bits -= 8;
}
return address_v4(b);
}
#if TORRENT_USE_IPV6
else if (family == AF_INET6)
{
typedef asio::ip::address_v6::bytes_type bytes_t;
bytes_t b;
std::memset(&b[0], 0xff, b.size());
for (int i = sizeof(bytes_t)/8-1; i > 0; --i)
{
if (bits < 8)
{
b[i] <<= bits;
break;
}
b[i] = 0;
bits -= 8;
}
return address_v6(b);
}
#endif
else
{
return address();
}
}
#endif
std::vector<ip_interface> enum_net_interfaces(io_service& ios, error_code& ec)
{
std::vector<ip_interface> ret;
// covers linux, MacOS X and BSD distributions
#if defined TORRENT_LINUX || defined TORRENT_BSD || defined TORRENT_SOLARIS
int s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
{
ec = error_code(errno, asio::error::system_category);
return ret;
}
ifconf ifc;
char buf[1024];
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if (ioctl(s, SIOCGIFCONF, &ifc) < 0)
{
ec = error_code(errno, asio::error::system_category);
close(s);
return ret;
}
char *ifr = (char*)ifc.ifc_req;
int remaining = ifc.ifc_len;
while (remaining)
{
ifreq const& item = *reinterpret_cast<ifreq*>(ifr);
if (item.ifr_addr.sa_family == AF_INET
#if TORRENT_USE_IPV6
|| item.ifr_addr.sa_family == AF_INET6
#endif
)
{
ip_interface iface;
iface.interface_address = sockaddr_to_address(&item.ifr_addr);
strcpy(iface.name, item.ifr_name);
ifreq req;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_name, item.ifr_name, IF_NAMESIZE);
if (ioctl(s, SIOCGIFMTU, &req) < 0)
{
ec = error_code(errno, asio::error::system_category);
close(s);
return ret;
}
iface.mtu = req.ifr_mtu;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_name, item.ifr_name, IF_NAMESIZE);
if (ioctl(s, SIOCGIFNETMASK, &req) < 0)
{
#if TORRENT_USE_IPV6
if (iface.interface_address.is_v6())
{
// this is expected to fail (at least on MacOS X)
iface.netmask = address_v6::any();
}
else
#endif
{
ec = error_code(errno, asio::error::system_category);
close(s);
return ret;
}
}
else
{
iface.netmask = sockaddr_to_address(&req.ifr_addr, item.ifr_addr.sa_family);
}
ret.push_back(iface);
}
#if defined TORRENT_BSD
int current_size = item.ifr_addr.sa_len + IFNAMSIZ;
#elif defined TORRENT_LINUX || defined TORRENT_SOLARIS
int current_size = sizeof(ifreq);
#endif
ifr += current_size;
remaining -= current_size;
}
close(s);
#elif defined TORRENT_WINDOWS || defined TORRENT_MINGW
// Load Iphlpapi library
HMODULE iphlp = LoadLibraryA("Iphlpapi.dll");
if (iphlp)
{
// Get GetAdaptersAddresses() pointer
typedef ULONG (WINAPI *GetAdaptersAddresses_t)(ULONG,ULONG,PVOID,PIP_ADAPTER_ADDRESSES,PULONG);
GetAdaptersAddresses_t GetAdaptersAddresses = (GetAdaptersAddresses_t)GetProcAddress(
iphlp, "GetAdaptersAddresses");
if (GetAdaptersAddresses)
{
PIP_ADAPTER_ADDRESSES adapter_addresses = 0;
ULONG out_buf_size = 0;
if (GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER
| GAA_FLAG_SKIP_ANYCAST, NULL, adapter_addresses, &out_buf_size) != ERROR_BUFFER_OVERFLOW)
{
FreeLibrary(iphlp);
ec = asio::error::operation_not_supported;
return std::vector<ip_interface>();
}
adapter_addresses = (IP_ADAPTER_ADDRESSES*)malloc(out_buf_size);
if (!adapter_addresses)
{
FreeLibrary(iphlp);
ec = asio::error::no_memory;
return std::vector<ip_interface>();
}
if (GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER
| GAA_FLAG_SKIP_ANYCAST, NULL, adapter_addresses, &out_buf_size) == NO_ERROR)
{
for (PIP_ADAPTER_ADDRESSES adapter = adapter_addresses;
adapter != 0; adapter = adapter->Next)
{
ip_interface r;
strncpy(r.name, adapter->AdapterName, sizeof(r.name));
r.name[sizeof(r.name)-1] = 0;
r.mtu = adapter->Mtu;
IP_ADAPTER_UNICAST_ADDRESS* unicast = adapter->FirstUnicastAddress;
while (unicast)
{
r.interface_address = sockaddr_to_address(unicast->Address.lpSockaddr);
ret.push_back(r);
unicast = unicast->Next;
}
}
}
// Free memory
free(adapter_addresses);
FreeLibrary(iphlp);
return ret;
}
FreeLibrary(iphlp);
}
SOCKET s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == SOCKET_ERROR)
{
ec = error_code(WSAGetLastError(), asio::error::system_category);
return ret;
}
INTERFACE_INFO buffer[30];
DWORD size;
if (WSAIoctl(s, SIO_GET_INTERFACE_LIST, 0, 0, buffer,
sizeof(buffer), &size, 0, 0) != 0)
{
ec = error_code(WSAGetLastError(), asio::error::system_category);
closesocket(s);
return ret;
}
closesocket(s);
int n = size / sizeof(INTERFACE_INFO);
ip_interface iface;
for (int i = 0; i < n; ++i)
{
iface.interface_address = sockaddr_to_address(&buffer[i].iiAddress.Address);
if (iface.interface_address == address_v4::any()) continue;
iface.netmask = sockaddr_to_address(&buffer[i].iiNetmask.Address
, iface.interface_address.is_v4() ? AF_INET : AF_INET6);
iface.name[0] = 0;
iface.mtu = 1500; // how to get the MTU?
ret.push_back(iface);
}
#else
#warning THIS OS IS NOT RECOGNIZED, enum_net_interfaces WILL PROBABLY NOT WORK
// make a best guess of the interface we're using and its IP
udp::resolver r(ios);
udp::resolver::iterator i = r.resolve(udp::resolver::query(asio::ip::host_name(ec), "0"), ec);
if (ec) return ret;
ip_interface iface;
for (;i != udp::resolver_iterator(); ++i)
{
iface.interface_address = i->endpoint().address();
iface.mtu = 1500;
if (iface.interface_address.is_v4())
iface.netmask = address_v4::netmask(iface.interface_address.to_v4());
ret.push_back(iface);
}
#endif
return ret;
}
address get_default_gateway(io_service& ios, error_code& ec)
{
std::vector<ip_route> ret = enum_routes(ios, ec);
#if defined TORRENT_WINDOWS || defined TORRENT_MINGW
std::vector<ip_route>::iterator i = std::find_if(ret.begin(), ret.end()
, boost::bind(&is_loopback, boost::bind(&ip_route::destination, _1)));
#else
std::vector<ip_route>::iterator i = std::find_if(ret.begin(), ret.end()
, boost::bind(&ip_route::destination, _1) == address());
#endif
if (i == ret.end()) return address();
return i->gateway;
}
std::vector<ip_route> enum_routes(io_service& ios, error_code& ec)
{
std::vector<ip_route> ret;
#if defined TORRENT_BSD
/*
struct rt_msg
{
rt_msghdr m_rtm;
char buf[512];
};
rt_msg m;
int len = sizeof(rt_msg);
bzero(&m, len);
m.m_rtm.rtm_type = RTM_GET;
m.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
m.m_rtm.rtm_version = RTM_VERSION;
m.m_rtm.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
m.m_rtm.rtm_seq = 0;
m.m_rtm.rtm_msglen = len;
int s = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
if (s == -1)
{
ec = error_code(errno, asio::error::system_category);
return std::vector<ip_route>();
}
int n = write(s, &m, len);
if (n == -1)
{
ec = error_code(errno, asio::error::system_category);
close(s);
return std::vector<ip_route>();
}
else if (n != len)
{
ec = asio::error::operation_not_supported;
close(s);
return std::vector<ip_route>();
}
bzero(&m, len);
n = read(s, &m, len);
if (n == -1)
{
ec = error_code(errno, asio::error::system_category);
close(s);
return std::vector<ip_route>();
}
for (rt_msghdr* ptr = &m.m_rtm; (char*)ptr < ((char*)&m.m_rtm) + n; ptr = (rt_msghdr*)(((char*)ptr) + ptr->rtm_msglen))
{
std::cout << " rtm_msglen: " << ptr->rtm_msglen << std::endl;
std::cout << " rtm_type: " << ptr->rtm_type << std::endl;
if (ptr->rtm_errno)
{
ec = error_code(ptr->rtm_errno, asio::error::system_category);
return std::vector<ip_route>();
}
if (m.m_rtm.rtm_flags & RTF_UP == 0
|| m.m_rtm.rtm_flags & RTF_GATEWAY == 0)
{
ec = asio::error::operation_not_supported;
return address_v4::any();
}
if (ptr->rtm_addrs & RTA_DST == 0
|| ptr->rtm_addrs & RTA_GATEWAY == 0
|| ptr->rtm_addrs & RTA_NETMASK == 0)
{
ec = asio::error::operation_not_supported;
return std::vector<ip_route>();
}
if (ptr->rtm_msglen > len - ((char*)ptr - ((char*)&m.m_rtm)))
{
ec = asio::error::operation_not_supported;
return std::vector<ip_route>();
}
int min_len = sizeof(rt_msghdr) + 2 * sizeof(sockaddr_in);
if (m.m_rtm.rtm_msglen < min_len)
{
ec = asio::error::operation_not_supported;
return std::vector<ip_route>();
}
ip_route r;
// destination
char* p = m.buf;
sockaddr_in* sin = (sockaddr_in*)p;
r.destination = sockaddr_to_address((sockaddr*)p);
// gateway
p += sin->sin_len;
sin = (sockaddr_in*)p;
r.gateway = sockaddr_to_address((sockaddr*)p);
// netmask
p += sin->sin_len;
sin = (sockaddr_in*)p;
r.netmask = sockaddr_to_address((sockaddr*)p);
ret.push_back(r);
}
close(s);
*/
int mib[6] = { CTL_NET, PF_ROUTE, 0, AF_UNSPEC, NET_RT_DUMP, 0};
size_t needed = 0;
if (sysctl(mib, 6, 0, &needed, 0, 0) < 0)
{
ec = error_code(errno, asio::error::system_category);
return std::vector<ip_route>();
}
if (needed <= 0)
{
return std::vector<ip_route>();
}
boost::scoped_array<char> buf(new (std::nothrow) char[needed]);
if (buf.get() == 0)
{
ec = asio::error::no_memory;
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;
int s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
{
ec = error_code(errno, asio::error::system_category);
return std::vector<ip_route>();
}
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(s, rtm, &r)) ret.push_back(r);
}
close(s);
#elif defined TORRENT_WINDOWS || defined TORRENT_MINGW
/*
move this to enum_net_interfaces
// 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);
*/
// Load Iphlpapi library
HMODULE iphlp = LoadLibraryA("Iphlpapi.dll");
if (!iphlp)
{
ec = asio::error::operation_not_supported;
return std::vector<ip_route>();
}
typedef DWORD (WINAPI *GetIpForwardTable2_t)(
ADDRESS_FAMILY, PMIB_IPFORWARD_TABLE2*);
typedef void (WINAPI *FreeMibTable_t)(PVOID Memory);
GetIpForwardTable2_t GetIpForwardTable2 = (GetIpForwardTable2_t)GetProcAddress(
iphlp, "GetIpForwardTable2");
FreeMibTable_t FreeMibTable = (FreeMibTable_t)GetProcAddress(
iphlp, "FreeMibTable");
if (GetIpForwardTable2 && FreeMibTable)
{
MIB_IPFORWARD_TABLE2* routes = NULL;
int res = GetIpForwardTable2(AF_UNSPEC, &routes);
if (res == NO_ERROR)
{
for (int i = 0; i < routes->NumEntries; ++i)
{
ip_route r;
r.gateway = sockaddr_to_address((const sockaddr*)&routes->Table[i].NextHop);
r.destination = sockaddr_to_address(
(const sockaddr*)&routes->Table[i].DestinationPrefix.Prefix);
r.netmask = build_netmask(routes->Table[i].SitePrefixLength
, routes->Table[i].DestinationPrefix.Prefix.si_family);
MIB_IFROW ifentry;
ifentry.dwIndex = routes->Table[i].InterfaceIndex;
if (GetIfEntry(&ifentry) == NO_ERROR)
{
wcstombs(r.name, ifentry.wszName, sizeof(r.name));
r.mtu = ifentry.dwMtu;
ret.push_back(r);
}
}
}
if (routes) FreeMibTable(routes);
FreeLibrary(iphlp);
return ret;
}
// Get GetIpForwardTable() pointer
typedef DWORD (WINAPI *GetIpForwardTable_t)(PMIB_IPFORWARDTABLE pIpForwardTable,PULONG pdwSize,BOOL bOrder);
GetIpForwardTable_t GetIpForwardTable = (GetIpForwardTable_t)GetProcAddress(
iphlp, "GetIpForwardTable");
if (!GetIpForwardTable)
{
FreeLibrary(iphlp);
ec = asio::error::operation_not_supported;
return std::vector<ip_route>();
}
MIB_IPFORWARDTABLE* routes = NULL;
ULONG out_buf_size = 0;
if (GetIpForwardTable(routes, &out_buf_size, FALSE) != ERROR_INSUFFICIENT_BUFFER)
{
FreeLibrary(iphlp);
ec = asio::error::operation_not_supported;
return std::vector<ip_route>();
}
routes = (MIB_IPFORWARDTABLE*)malloc(out_buf_size);
if (!routes)
{
FreeLibrary(iphlp);
ec = asio::error::no_memory;
return std::vector<ip_route>();
}
if (GetIpForwardTable(routes, &out_buf_size, FALSE) == NO_ERROR)
{
for (int i = 0; i < routes->dwNumEntries; ++i)
{
ip_route r;
r.destination = inaddr_to_address((in_addr const*)&routes->table[i].dwForwardDest);
r.netmask = inaddr_to_address((in_addr const*)&routes->table[i].dwForwardMask);
r.gateway = inaddr_to_address((in_addr const*)&routes->table[i].dwForwardNextHop);
MIB_IFROW ifentry;
ifentry.dwIndex = routes->table[i].dwForwardIfIndex;
if (GetIfEntry(&ifentry) == NO_ERROR)
{
wcstombs(r.name, ifentry.wszName, sizeof(r.name));
r.name[sizeof(r.name)-1] = 0;
r.mtu = ifentry.dwMtu;
ret.push_back(r);
}
}
}
// Free memory
free(routes);
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>();
}
int s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
{
ec = error_code(errno, asio::error::system_category);
return std::vector<ip_route>();
}
for (; NLMSG_OK(nl_msg, len); nl_msg = NLMSG_NEXT(nl_msg, len))
{
ip_route r;
if (parse_route(s, nl_msg, &r)) ret.push_back(r);
}
close(s);
close(sock);
#endif
return ret;
}
}
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