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fix clearing of netmask if it's not known, on windows

This commit is contained in:
arvidn 2020-01-17 01:09:23 +01:00 committed by Arvid Norberg
parent d13109426a
commit a0b0f2aec5
1 changed files with 27 additions and 6 deletions
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31
src/enum_net.cpp
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@ -424,6 +424,7 @@ int _System __libsocket_sysctl(int* mib, u_int namelen, void *oldp, size_t *oldl
void build_netmask_impl(span<unsigned char> mask, int prefix_bits)
{
TORRENT_ASSERT(prefix_bits <= mask.size() * 8);
TORRENT_ASSERT(prefix_bits >= 0);
int i = 0;
while (prefix_bits >= 8)
{
@ -704,25 +705,45 @@ int _System __libsocket_sysctl(int* mib, u_int namelen, void *oldp, size_t *oldl
continue;
r.preferred = unicast->DadState == IpDadStatePreferred;
r.interface_address = sockaddr_to_address(unicast->Address.lpSockaddr);
// OnLinkPrefixLength is only present on Vista and newer
int const max_prefix_len = family == AF_INET ? 32 : 128;
if (unicast->Length >= 64 && unicast->OnLinkPrefixLength <= max_prefix_len)
if (unicast->Length <= offsetof(IP_ADAPTER_UNICAST_ADDRESS, OnLinkPrefixLength))
{
r.netmask = build_netmask(unicast->OnLinkPrefixLength, family);
// OnLinkPrefixLength is only present on Vista and newer. If
// we're running on XP, we don't have the netmask.
r.netmask = (family == AF_INET)
? address(address_v4())
: address(address_v6());
ret.push_back(r);
continue;
}
if (family == AF_INET6 && (unicast->PrefixOrigin == IpPrefixOriginDhcp
if (family == AF_INET6
&& unicast->OnLinkPrefixLength == 128
&& (unicast->PrefixOrigin == IpPrefixOriginDhcp
|| unicast->SuffixOrigin == IpSuffixOriginRandom))
{
// DHCPv6 does not specify a subnet mask (it should be taken from the RA)
// but apparently MS didn't get the memo and incorrectly reports a
// prefix length of 128 for DHCPv6 assigned addresses
// 128 is also reported for privacy addresses despite claiming to
// have gotten the prifix length from the RA *shrug*
// have gotten the prefix length from the RA *shrug*
// use a 64 bit prefix in these cases since that is likely to be
// the correct value, or at least less wrong than 128
r.netmask = build_netmask(64, family);
}
else if (unicast->OnLinkPrefixLength <= max_prefix_len)
{
r.netmask = build_netmask(unicast->OnLinkPrefixLength, family);
}
else
{
// we don't know what the netmask is
r.netmask = (family == AF_INET)
? address(address_v4())
: address(address_v6());
}
ret.push_back(r);
}
}