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populate ip_interface.netmask on Windows

This commit is contained in:
Steven Siloti 2020-01-15 20:25:47 -08:00 committed by Arvid Norberg
parent 82d4d1927d
commit e4e967335c
1 changed files with 21 additions and 1 deletions
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22
src/enum_net.cpp
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@ -699,10 +699,30 @@ int _System __libsocket_sysctl(int* mib, u_int namelen, void *oldp, size_t *oldl
for (IP_ADAPTER_UNICAST_ADDRESS* unicast = adapter->FirstUnicastAddress;
unicast; unicast = unicast->Next)
{
if (!valid_addr_family(unicast->Address.lpSockaddr->sa_family))
auto const family = unicast->Address.lpSockaddr->sa_family;
if (!valid_addr_family(family))
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)
{
r.netmask = build_netmask(unicast->OnLinkPrefixLength, family);
}
if (family == AF_INET6 && (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*
// 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);
}
ret.push_back(r);
}
}