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net/IPv4Address: add various helper methods

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This commit is contained in:
Max Kellermann 2018-08-20 15:55:24 +02:00
parent 9cb9154b08
commit 4c6ae4e9e8
1 changed files with 43 additions and 0 deletions
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43
src/net/IPv4Address.hxx
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@ -158,6 +158,26 @@ public:
return ConstructInAddr(INADDR_LOOPBACK);
}
/**
* Generate a (net-)mask with the specified prefix length.
*/
static constexpr IPv4Address MaskFromPrefix(unsigned prefix_length) noexcept {
return Construct(prefix_length == 0
? 0
: (~uint32_t(0)) << (32 - prefix_length),
~uint16_t(0));
}
/**
* Return a downcasted reference to the address. This call is
* only legal after verifying SocketAddress::GetFamily().
*/
static constexpr const IPv4Address &Cast(const SocketAddress src) noexcept {
/* this reinterpret_cast works because this class is
just a wrapper for struct sockaddr_in6 */
return *(const IPv4Address *)(const void *)src.GetAddress();
}
constexpr operator SocketAddress() const noexcept {
return SocketAddress((const struct sockaddr *)&address,
sizeof(address));
@ -188,6 +208,29 @@ public:
constexpr const struct in_addr &GetAddress() const noexcept {
return address.sin_addr;
}
/**
* @return the 32 bit IP address in network byte order
*/
constexpr uint32_t GetNumericAddressBE() const noexcept {
return GetAddress().s_addr;
}
/**
* @return the 32 bit IP address in host byte order
*/
constexpr uint32_t GetNumericAddress() const noexcept {
return FromBE32(GetNumericAddressBE());
}
/**
* Bit-wise AND of two addresses. This is useful for netmask
* calculations.
*/
constexpr IPv4Address operator&(const IPv4Address &other) const noexcept {
return IPv4Address(ConstructInAddrBE(GetNumericAddressBE() & other.GetNumericAddressBE()),
GetPort() & other.GetPort());
}
};
#endif