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use getifaddrs on linux to enumerate interfaces

This commit is contained in:
Arvid Norberg 2011-02-15 06:29:44 +00:00
parent 7d300c807a
commit b6b0970e16
2 changed files with 80 additions and 5 deletions
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4
examples/enum_if.cpp
View File

@ -83,12 +83,12 @@ int main()
return 1;
}
printf("%-35s%-18s%-40s%-8sflags\n", "address", "netmask", "name", "mtu");
printf("%-30s%-45s%-20s%-8sflags\n", "address", "netmask", "name", "mtu");
for (std::vector<ip_interface>::const_iterator i = net.begin()
, end(net.end()); i != end; ++i)
{
printf("%-35s%-18s%-40s%-8d%s%s%s\n"
printf("%-30s%-45s%-20s%-8d%s%s%s\n"
, i->interface_address.to_string(ec).c_str()
, i->netmask.to_string(ec).c_str()
, i->name

81
src/enum_net.cpp
View File

@ -80,6 +80,8 @@ POSSIBILITY OF SUCH DAMAGE.
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <ifaddrs.h>
#endif
namespace libtorrent { namespace
@ -279,6 +281,34 @@ namespace libtorrent { namespace
}
#endif
#if defined TORRENT_LINUX
bool iface_from_ifaddrs(ifaddrs *ifa, ip_interface &rv, error_code& ec)
{
int family = ifa->ifa_addr->sa_family;
if (family != AF_INET
#if TORRENT_USE_IPV6
&& family != AF_INET6
#endif
)
{
return false;
}
strncpy(rv.name, ifa->ifa_name, sizeof(rv.name));
rv.name[sizeof(rv.name)-1] = 0;
// determine address
rv.interface_address = sockaddr_to_address(ifa->ifa_addr);
// determine netmask
if (ifa->ifa_netmask != NULL)
{
rv.netmask = sockaddr_to_address(ifa->ifa_netmask);
}
return true;
}
#endif
}} // <anonymous>
namespace libtorrent
@ -302,7 +332,7 @@ namespace libtorrent
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());
return memcmp(&b1[0], &b2[0], b1.size()) == 0;
}
#endif
return (a1.to_v4().to_ulong() & mask.to_v4().to_ulong())
@ -370,8 +400,53 @@ namespace libtorrent
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
#if defined TORRENT_LINUX
int s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
{
ec = error_code(errno, asio::error::system_category);
return ret;
}
ifaddrs *ifaddr;
if (getifaddrs(&ifaddr) == -1)
{
ec = error_code(errno, asio::error::system_category);
close(s);
return ret;
}
for (ifaddrs* ifa = ifaddr; ifa; ifa = ifa->ifa_next)
{
if (ifa->ifa_addr == 0) continue;
if ((ifa->ifa_flags & IFF_UP) == 0) continue;
int family = ifa->ifa_addr->sa_family;
if (family == AF_INET
#if TORRENT_USE_IPV6
|| family == AF_INET6
#endif
)
{
ip_interface iface;
if (iface_from_ifaddrs(ifa, iface, ec))
{
ifreq req;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_name, iface.name, IF_NAMESIZE);
if (ioctl(s, SIOCGIFMTU, &req) < 0)
{
continue;
}
iface.mtu = req.ifr_mtu;
ret.push_back(iface);
}
}
}
close(s);
freeifaddrs(ifaddr);
// MacOS X, BSD and solaris
#elif defined TORRENT_BSD || defined TORRENT_SOLARIS
int s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
{