Function LookupSubNet

src/netbase.cpp:679–712

}

bool LookupSubNet(const std::string& subnet_str, CSubNet& subnet_out)
{
    if (!ValidAsCString(subnet_str)) {
        return false;
    }

    const size_t slash_pos{subnet_str.find_last_of('/')};
    const std::string str_addr{subnet_str.substr(0, slash_pos)};
    CNetAddr addr;

    if (LookupHost(str_addr, addr, /*fAllowLookup=*/false)) {
        if (slash_pos != subnet_str.npos) {
            const std::string netmask_str{subnet_str.substr(slash_pos + 1)};
            uint8_t netmask;
            if (ParseUInt8(netmask_str, &netmask)) {
                // Valid number; assume CIDR variable-length subnet masking.
                subnet_out = CSubNet{addr, netmask};
                return subnet_out.IsValid();
            } else {
                // Invalid number; try full netmask syntax. Never allow lookup for netmask.
                CNetAddr full_netmask;
                if (LookupHost(netmask_str, full_netmask, /*fAllowLookup=*/false)) {
                    subnet_out = CSubNet{addr, full_netmask};
                    return subnet_out.IsValid();
                }
            }
        } else {
            // Single IP subnet (<ipv4>/32 or <ipv6>/128).
            subnet_out = CSubNet{addr};
            return subnet_out.IsValid();
        }
    }
    return false;
}

bool SetSocketNonBlocking(const SOCKET& hSocket, bool fNonBlocking)
{