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